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Academic literature on the topic 'The multiferroic BiFeO3'

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Published: 1 June 2024

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Journal articles on the topic "The multiferroic BiFeO3":

1

Algueró, M., H. Amorín, C. M. Fernández-Posada, O. Peña, P. Ramos, E. Vila, and A. Castro. "Perovskite solid solutions with multiferroic morphotropic phase boundaries and property enhancement." Journal of Advanced Dielectrics 06, no. 02 (June 2016): 1630004. http://dx.doi.org/10.1142/s2010135x16300048.

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Recently, large phase-change magnetoelectric response has been anticipated by a first-principles investigation of phases in the BiFeO3–BiCoO3 perovskite binary system, associated with the existence of a discontinuous morphotropic phase boundary (MPB) between multiferroic polymorphs of rhombohedral and tetragonal symmetries. This might be a general property of multiferroic phase instabilities, and a novel promising approach for room temperature magnetoelectricity. We review here our current investigations on the identification and study of additional material systems, alternative to BiFeO3–BiCoO3 that has only been obtained by high pressure synthesis. Three systems, whose phase diagrams were, in principle, liable to show multiferroic MPBs have been addressed: the BiMnO3–PbTiO3 and BiFeO3–PbTiO3 binary systems, and the BiFeO3–BiMnO3–PbTiO3 ternary one. A comprehensive study of multiferroism across different solid solutions was carried out based on electrical and magnetic characterizations, complemented with mechanical and electromechanical measurements. An in-depth structural analysis was also accomplished when necessary.
2

Xu, Fang Long, Peng Jun Zhao, Jia Qi Zhang, and Xin Qian Xiong. "Fluorine Doping Effects on the Electric Property of BiFeO3 Thin Films." Applied Mechanics and Materials 624 (August 2014): 161–64. http://dx.doi.org/10.4028/www.scientific.net/amm.624.161.

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F doping BiFeO3-xFx (x=0, 0.02, 0.04, 0.06, 0.08) thin films were successfully fabricated on ITO/glass substrates by sol-gel method. X-ray diffraction analysis indicated that the un-doped BiFeO3 and F doping BiFeO3 thin films presented rhombohedral structure with the space group R3c. F-doping is found to significantly enhance the dielectric constant and decrease the leakage current density for x=0.08 compared with x=0. This study provides direct evidence that the multiferroic characteristics of BiFeO3 are sensitive to the anion doping, such as F, providing a convenient alternative to manipulate the electric polarization in multiferroic oxides.
3

Hang, Qi Ming, Xin Hua Zhu, Zhen Jie Tang, Ye Song, and Zhi Guo Liu. "Self-Assembled Perovskite Epitaxial Multiferroic BiFeO3 Nanoislands." Advanced Materials Research 197-198 (February 2011): 1325–31. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.1325.

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Perovskite epitaxial multiferroic BiFeO3 nanoislands were grown on SrTiO3 (100) and Nb-doped SrTiO3 (100) single crystal substrates by chemical self-assembled method. Their phase structure and morphology were characterized by X-ray diffraction, scanning electron microscopy, and atomic force microscopy, respectively. The results showed that epitaxial multiferroic BiFeO3 nanoislands were obtained via post-annealing process in the temperature range of 650 - 800°C, and their lateral sizes were in the range of 50 - 160 nm and height of 6 -12 nm. With increasing the post-annealing temperature, the morphology of BiFeO3 nanoisland in the (100) growth plane evolved from tri-angled to squared, and then to plated shapes. By using piezo-force microscopy, ferroelectric characteristics of a single epitaxial BiFeO3 nanoisland (with lateral size of ~ 50 nm and height of 12 nm) grown on Nb-doped SrTiO3 (100) single crystal substrate, was characterized. The results demonstrated that fractal ferroelectric domains existed in the single BiFeO3 nanoisland, and self-biased polarization was also observed within this multiferroic nanoisland. This phenomenon can be ascribed to the interfacial stress caused by the lattice misfit between the BiFeO3 nanoisland and the SrTiO3 single crystal substrate.
4

William, R. V., A. Marikani, and K. Gangatharan. "Investigation of Multiferroic BiFeO3 Nanorods Using 2-MOE(C3H8O2)-Assisted Citrate Sol–Gel Method." International Journal of Nanoscience 18, no. 05 (July 24, 2019): 1850029. http://dx.doi.org/10.1142/s0219581x18500291.

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Bismuth ferrite (BiFeO[Formula: see text] nanorods have been prepared from 2-methoyethanol (2-MOE)-assisted sol–gel technique. Structure, dielectric, and magnetic properties of BiFeO3 nanorods are briefly discussed in this paper. Fourier-transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) results suggest that the BiFeO3 peaks calcined at 500∘C exhibit a distorted rhombohedral perovskite structure with the absence of other secondary phases like Bi2Fe4O9. Meanwhile, the BiFeO3 showed excellent photoluminescence (PL) behavior due to the transmission of electrons from conduction band to the valence band. Ferroelectric hysteresis loop of BiFeO3 shows an increase of coercivity from 5.5–6[Formula: see text][Formula: see text]C/cm2 in a frequency range of 6–12[Formula: see text]kHz. The magnetization measurement resulted in a well-saturated ferromagnetic behavior, and in addition, the temperature-dependent magnetization was discussed for BiFeO3 nanorod using superconducting quantum interference device (SQUID) method. The zero-field-cooled (ZFC) and field-cooled (FC) curves reveal spin-glass effect owing to size effects, spin exchange, and anisotropy of material assembly.
5

Verseils, M., K. Beauvois, A. Litvinchuk, S. deBrion, V. Simonet, E. Ressouche, V. Skumryev, and M. Gospodinov. "Investigation of High Pressure Phase Transition by Means of Infrared Spectroscopy in the Cairo Frustrated Pentagonal Magnet Bi2Fe4O9." Proceedings 26, no. 1 (September 5, 2019): 31. http://dx.doi.org/10.3390/proceedings2019026031.

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Yao, Minghai, Long Cheng, Shenglan Hao, Samir Salmanov, Mojca Otonicar, Frédéric Mazaleyrat, and Brahim Dkhil. "Great multiferroic properties in BiFeO3/BaTiO3 system with composite-like structure." Applied Physics Letters 122, no. 15 (April 10, 2023): 152904. http://dx.doi.org/10.1063/5.0139017.

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Multiferroic materials have attracted significant research attention due to their technological potential for applications as multifunctional devices. The scarcity of single-phase multiferroics and their low inherent coupling between multiferroic order parameters above room temperature pose a challenge to their further applications. We propose a 3BiFeO3/7BaTiO3 perovskite–perovskite composite that combines ferroelectricity and ferromagnetism. We demonstrate that the sintering temperature can tailor the ferroelectricity and ferromagnetism of the composites. The multiferroicity can be achieved at a low sintering temperature in the composite-like structure ceramics, and its multiferroic properties, especially the ferromagnetism, are superior to those of solid solutions. We also investigate the dynamic evolution of multiferroicity with sintering temperature. We adopt a nano–micro strategy to construct a composite-like microstructure, which results in optimized ferroelectric (1.62 μC cm−2) and ferromagnetic (0.16 emu/g) characteristics at a sintering temperature of 750 °C. We also found experimental evidence of the competition between antiferromagnetic and ferromagnetic interactions in the transition metal cation sublattice. Multiferroic BiFeO3/BaTiO3 composites with combined ferroelectric and ferromagnetic properties have significant potential for various applications.
7

Suastiyanti, Dwita. "Improvement of magnetic properties through the synthesis of ceramic materials with various weight ratios of BaTiO, BiFeO3, and BaFe12O19 with sol-gel method." ASM Science Journal 17 (December 15, 2022): 1–6. http://dx.doi.org/10.32802/asmscj.2022.1147.

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Electronic devices designed with multiferroic materials comprising both electrical and magnetic properties are needed for significant memory storage. Several studies have been carried out on multiferroic materials based on BaTiO3, BiFeO3, and BaFe12O19. However, none have obtained optimum multiferroic properties because they still show inadequate magnetic properties, especially energy values. Therefore, this study aims to enhance the mechanical properties of ceramics synthesized by the sol-gel method. The XRD and permagraph tests with metallographic observations using Scanning Electron Microscopy (SEM) were used to enhance the ceramic compounds by mixing powder based on BaTiO3, BiFeO3, and BaFe12O19. Furthermore, the ratio of the weight composition of the materials varied by 1:1:1; 1:2:2; 2:1:1; 1:2:1 and 2:1:2. The result showed that the best magnetic properties were obtained at the weight composition ratio of 1:2:2 with a magnetic energy value of 48.0897x104 GkA/m. Based on SEM analysis, the sample with this weight ratio was dominated by the BiFeO3 and BaFe12O19 phases with high magnetic properties.
8

Zhang, Runqing, Peiju Hu, Lingling Bai, Xing Xie, Huafeng Dong, Minru Wen, Zhongfei Mu, Xin Zhang, and Fugen Wu. "New multiferroic BiFeO3 with large polarization." Physical Chemistry Chemical Physics 24, no. 10 (2022): 5939–45. http://dx.doi.org/10.1039/d1cp05452j.

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Borissenko, Elena, Alexei Bosak, Pauline Rovillain, Maximilien Cazayous, Marco Goffinet, Philippe Ghosez, Dorothée Colson, and Michael Krisch. "Lattice dynamics of multiferroic BiFeO3." Acta Crystallographica Section A Foundations of Crystallography 66, a1 (August 29, 2010): s167. http://dx.doi.org/10.1107/s0108767310096248.

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Goswami, Sudipta, Dipten Bhattacharya, P. Choudhury, B. Ouladdiaf, and T. Chatterji. "Multiferroic coupling in nanoscale BiFeO3." Applied Physics Letters 99, no. 7 (August 15, 2011): 073106. http://dx.doi.org/10.1063/1.3625924.

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Journal articles Dissertations / Theses

Dissertations / Theses on the topic "The multiferroic BiFeO3":

1

Waterfield, Price Noah. "Domains and functionality in multiferroic BiFeO3 films." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:e8a8f8ff-8510-4fdf-93f4-0037cebc0210.

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For over half a century, the technological promise of spins manipulable by a small voltage has captivated the interest of experimental and theoretical researchers alike. However, if thin-film multiferroics are to be incorporated into future data storage devices, a much greater understanding of their behaviour and how they differ from their bulk counterparts is required. In this thesis, we probe the fundamental multiferroic properties of BiFeO3 films through a combination of state-of-the-art diffraction and microscopy techniques. We investigate the coupling between magnetic, ferroelectric, and structural order, with a focus on domains, and how the domain structure may be manipulated in order to tailor the multiferroic properties of the material. Using non-resonant magnetic x-ray scattering (NXMS) and neutron diffraction, we study the magnetic and structural properties of (111)pc-oriented BiFeO3 films. Contrary to the general belief that to they grow as a rhombohedral monodomain, we find that they comprise a sub-micron texture of monoclinic domains. The magnetic structure is found to be intimately coupled to the structure, resulting in the propagation vector being locked to the monoclinic b-axis. This magnetoelastic coupling opens up a route to strain-engineer the magnetic domains via epitaxial strain. By growing BiFeO3 films on a lower-symmetry, TbScO3 substrate, we are able to engineer a magnetic, structural and ferroelectric monodomain, coherent over the entire film, constituting an increase in the domain size by over five orders of magnitude. We directly demonstrate the coupling between ferroelectric and magnetic order parameters of the cycloidal magnetic structure. Using NXMS polarimetry to measure directly the magnetic polarity, we show that upon switching the ferroelectric polarisation, the magnetic polarity switches accordingly---a major rearrangement of the magnetic structure, with each spin rotating by 90 degrees on average. This goes counter to idea that magnetic and ferroelectric order parameters are only weakly coupled in type-I multiferroics. Finally, using photoemission electron microscopy we are able to directly image the sub-micron magnetostructural domain structure. We further show that there is a strong interfacial coupling between the magnetostructural domains of BiFeO3 with a ferromagnetic overlayer. The BiFeO3 domains are found to impose a uniaxial anisotropy in the overlayer, opening up a route to control ferromagnetic domains.
2

Masteghin, João Francisco Vieira. "Síntese e propriedades de filmes finos multiferróicos de BiFeO3." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153560.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Foram preparados filmes finos, de Ferrita de Bismuto (BiFeO3), considerado um dos principais multiferróico que são classes de materiais que apresentam ferroeletricidade e ferromagnetismo simultaneamente. Os filmes foram preparados por um rota química chamada de Sol-gel modificado, variando-se a quantidade de % de mol do Bismuto, depositados em substratos de platina Pt/TiO2/SiO2/Si(100), variando-se a temperatura de cristalização entre 400°C a 600°C, com o objetivo de eliminar algumas fases indesejadas encontradas na literatura. Alguns filmes finos passaram pelo tratamento térmico em atmosférica de O2, com o intuito de diminuir a condutividade, causada pelas vacâncias de oxigênio no material. Pelos resultados obtidos foi possível conseguir filmes finos sem as fases indesejadas e com condutividade não tão alta, sendo possível realizar análises elétricas. Assim, tornou-se possível analisar o comportamento da permissividade, impedância e condutividade em função do campo aplicado e da temperatura. Com tais resultados mostra-se a indicação de polarização iônica nestes filmes. Eles apresentam uma energia de ativação parecida com filme finos encontrados na literatura. Além disso, também mostra que o comportamento das propriedades físicas são os mesmos quando varia a temperatura e o campo.
Bismuth Ferrite (BiFeO3) thin films were prepared, considered one of the main multiferroic that are classes of materials that present ferroelectricity and ferromagnetism simultaneously. The films were prepared by a chemical path called modified sol-gel, varying the amount of Bismuth mol percentage, deposited on Pt/TiO2/SiO2/Si(100) platinum substrates, varying the crystallization temperature between 400 °C to 600 °C, with the aim of eliminating some unwanted phases found in literature. Some thin films underwent the thermal treatment in atmospheric O2, in order to reduce the conductivity, caused by the oxygen vacancies in the material. By the results obtained, it was possible to obtain thin films without the undesired phases and with not so high conductivity, being possible to perform electrical analysis. This way it was possible to analyze the behavior of the permissiveness, impedance and conductivity in function of the applied field and temperature. With these results, it is shown an indication of ionic polarization in these films. They have an activation energy similar to thin films found in literature. It is also shown that the behavior of the physical properties are the same when temperature and the field change.
3

González, Vázquez Otto E. "First-principles investigation of BiFeO3 and related multiferroic materials." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/96248.

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Esta tesis trata sobre los magnetoel ectricos multiferroicos, una clase relativamente nueva de materiales descubiertos a mediados del siglo pasado, que presentan simultaneamente ferroelectricidad y magnetismo. El BiFeO3 (BFO) es un oxido con estructura perovskita, el cual es uno de los pocos materiales multiferroicos a temperatura ambiente. Sin embargo, como sus temperaturas de ordenamiento ferroel ectrico y anti-ferromagn etico son relativamente altas (alrededor de 1100 K y 640 K, respectivamente), las respuestas electromec anica y magnetoel ectrica del BFO son relativamente peque~nas en condiciones ambientales. En esta tesis se utilizamos m etodos ab-initio, basados en la teor a del funcional de la densidad (DFT), para estudiar las propiedades del BFO, y proponemos una posible estrategia para la mejora de su respuesta. Hemos utilizado m etodos de primeros principios para llevar a cabo una b usqueda sistem atica de las fases potencialmente estables de este compuesto. En la que consideramos las distorsiones m as comunes entre los oxidos de tipo perovskita y encontrando un gran n umero de m nimos locales de la energ a. En este trabajo se discute la gran variedad de estructuras de baja simetr a descubiertas, as como las implicaciones de estos hallazgos en cuanto a los trabajos experimentales mas recientes sobre este compuesto. Tambi en se llev o acabo un estudio de la soluci on s olida Bi1􀀀��xLax FeO3 (BLFO) formada por la BFO y la LaFeO3 (LFO)antiferromagnetica parael ectrica. Se discuten las transformaciones estructurales que sufre BLFO en funci on del contenido de La, y la conexi on de nuestros resultados con los estudios cristalogr a cos existentes. Hemos encontrado que, en una amplia gama de composiciones intermedias, la BLFO presenta fases que son esencialmente degeneradas en energ a. Adem as, los resultados sugieren que para este compuesto, dentro de esta regi on morfotr opica inusual, se puede utilizar un campo el ectrico para inducir transiciones parael ectrico a ferroel ectrico. Tambi en se discuten las propiedades de respuesta de la BLFO y se demuestra que se pueden mejorar signi cativamente en los materiales puros BFO y LFO, mediante la sustituci on parcial de los atomos Bi y La . Por otra parte, se presenta tambi en un estudio de primeros principios de la BFO a altas presiones. En el cual explicamos la naturaleza de las transiciones de fase del BFO, que simult aneamente involucran un colapso del volumen, un cambio en el estado de spin de High spin a Low spin y una metalizaci on producto del desorden magn etico en la nueva fase. Por ultimo presentamos los resultados preliminares de un proyecto en marcha, en el cual estamos modelando la energ etica de las rotaciones de los octaedros de oxigeno en los oxidos de estructura perovskita. Para ello se ha expandido la energ a en funci on de los par ametros de orden que caracterizan dichas rotaciones hasta cuarto orden. Hemos teado el modelo a los resultados de nuestros c alculos de primeros principios y realizado una comprobaci on cuidadosa de su valides, determinando que es necesario recurrir a ordenes mas altos en nuestra teor a.
This work is about magnetoeltric multiferroics, a relatively new class of ma- terials discovered by the mid of the past century, which involve simultaneously ferroelectricity and magnetism. Perovskite oxide BiFeO3 (BFO) is one of the few multiferroic materials at room temperature. However, as its ferroelectric and anti- ferromagnetic transition temperatures are relatively high (about 1100 K and 640 K, respectively), BFO's electromechanical and magnetoelectric responses are small at ambient conditions. In this thesis we used ab-initio methods, based on density functional theory, to study the basic properties of BFO and proposed possible strategies for enhancing its response. We used rst-principles methods to perform a systematic search for potentially stable phases of BFO. We considered the distortions that are most common among perovskite oxides and found a large number of local minima of the energy. We discussed the variety of low-symmetry structures discovered, as well as the implications of these ndings as regards current experimental work on this compound. We also carried out a study of the Bi1􀀀�xLaxFeO3 (BLFO) solid solution formed by multiferroic BFO and the paraelectric antiferromagnet LaFeO3 (LFO). We dis- cussed the structural transformations that BLFO undergoes as a function of La content and the connection of our results with the existing crystallographic stud- ies. We found that, in a wide range of intermediate compositions, BLFO presents competitive phases that are essentially degenerate in energy. Further, our results suggested that, within this unusual morphotropic region, an electric eld might be used to induce various types of paraelectric-to-ferroelectric transitions in the compound. We also discussed BLFO's response properties and showed that they can be signi cantly enhanced by partial substitution of Bi/La atoms in the pure BFO and LFO materials. We analyzed the atomistic mechanisms responsible for such improved properties and showed that the e ects can be captured by simple phenomenological models that treat explicitly the composition x in a Landau-like potential. Furthermore, we performed a rst-principles study of BFO at high pressures. Our work revealed the main structural change in Bi's coordination and suppression of the ferroelectric distortion, electronic spin crossover and metallization, and mag- netic loss of order e ects favored by compression and how they are connected. Our results are consistent with and explain the striking manifold transitions observed experimentally We conclude our thesis presenting the preliminary results of an ongoing project in which we are modeling the energetics of the oxygen octahedra rotations in per- ovskite oxides. The model is tted to the rst-principles results and a careful check of its validity is carried out.
4

Blouzon, Camille. "Photoelectric and magnetic properties of multiferroic domain walls in BiFeO3." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066006/document.

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De tous les matériaux multiferroïques, BiFeO3 est celui qui est le plus étudié. C’est un ferroélectrique, antiferromagnétique dont les températures de transition sont bien au-dessus de la température ambiante. De plus, le couplage magnétoélectrique entre ces deux paramètres d’ordre a été observé aussi bien dans les cristaux que dans les couches minces. BiFeO3 possède également la plus grande polarisation ferroélectrique jamais mesurée, 100µC/cm². De gros efforts sont fournis pour comprendre et exploiter les propriétés physiques de ce matériau. Dans ce but, il est important de pouvoir contrôler sa structure en domaines afin d’étudier les phénomènes émergeant aux parois de ces domaines. C’est l’objectif de cette thèse : étudier quelques une des propriétés de BiFeO3, comme la photoélectricité et le magnétisme, tout en prêtant en parallèle une attention particulière à la caractérisation de ces propriétés, dans un domaine et dans une paroi, avec des techniques originales telles que la microscopie de photocourants à balayage (MPB) et le rayonnement synchrotron ou les champs magnétiques intenses. Les images obtenues par MPB, révèlent qu’un champ dépolarisant proche d’une paroi de domaine à 180° peut améliorer de manière significative le rendement des effets photoélectriques : les parois de domaines peuvent être générées et positionnées dans le but de contrôler localement le rendement de l’effet photoélectrique. De plus, l’imagerie de la figure de diffraction de surface d’un réseau de parois de domaines dans des couches minces, par diffusion magnétique résonante de rayons X, permet de montrer que les parois de domaines entraînent la formation de structures magnétiques particulières qui pourraient donner lieu à une aimantation
Among all multiferroics, BiFeO3 is a material of choice because its two ordering temperatures are well above 300K. It is a ferroelectric antiferromagnet, and magnetoelectric coupling has been demonstrated in bulk and in thin films. Remarkably, BiFeO3 has the largest polarization of all known ferroelectrics (100µC/cm²). A huge research effort is carried out worldwide to understand and exploit the physical properties of this material which requires to design and tailor BiFeO3 on many scales. In this sense, developing methods and tools to control the domain structure is essential to explore new emergent phenomena arising at domain walls. This is the aim of the present PhD work. Some of the original properties of BiFeO3 have been investigated including its photoelectric and magnetic properties. A particular attention is given to characterize in a parallel fashion bulk properties and domain walls properties, using original techniques of characterization such as Scanning Photocurrent Microscopy (SPCM), scattering synchrotron facilities or high field pulses. SPCM mapping reveals that depolarizing fields in the vicinity of a 180° domain wall can significantly improve the photovoltaic efficiency. Thus domain walls can be generated and precisely positioned in order to tailor the local photovoltaic efficiency. Moreover, X-ray resonant magnetic scattering on thin films with periodic domain structure shows that domain walls generate specific magnetic structures with possible uncompensated magnetization
5

Thrall, Michael. "The magnetic, electric and structural properties of multiferroic BiFeo3 and BiMnO3." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492716.

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Bulk BiFe03 samples prepared by the conventional mixed oxide route were investigated. High purity Bi203 and Fe203 powders were weighed according to stoichiometry and milled for 20 hours. The powders were pressed into cylinders (10mm diameter by 6mm thickness) at 100 MPa. The cylinders were heated at a rate of 3 degrees C/min at temperatures of between 700 degrees C and 900°C for times between 7.5 minutes and 48 hours. XRD spectra collected from both the as-sintered and 'bulk' (internal) surfaces showed the formation of additional Bi2Fe40, and Bi25Fe04o secondary phases coexisting alongside the main BiFeOs phase.
6

Wójcik, Katarzyna. "The synthesis, structure and reactivity of iron-bismuth complexes : Potential Molecular Precursors for Multiferroic BiFeO3." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000715.

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The thesis presented here is focused on the synthesis of iron-bismuth alkoxides and siloxides as precursors for multiferroic BiFeO3 systems. Spectrum of novel cyclopentadienyl substituted iron-bismuth complexes of the general type [{Cpy(CO)2Fe}BiX2], as potential precursors for cyclopentadienyl iron-bismuth alkoxides or siloxides [{Cpy(CO)2Fe}Bi(OR)2] (R-OtBu, OSiMe2tBu), were obtained and characterised. The use of wide range of cyclopentadienyl rings in the iron carbonyl compounds allowed for a comprehensive analysis of its influence on structure, reactivity as well as solubility of the studied complexes, which are crucial features of potential precursors. The results fill the gap in the chemistry of cyclopentadienyl iron-bismuth complexes. In this work a new method of preparation of novel alkoxides or siloxides iron-bismuth complexes has been developed. In the reaction of Fe2(CO)9 with Bi(OtBu)3 or Bi(OSiMe2tBu)3 molecular precursors for preparation of heterobimetallic oxides were obtained. Moreover, characterised compounds allowed to extend the knowledge about existence of iron-bismuth clusters and open new ways for the further investigations on the carbonyl iron-bismuth siloxides and alkoxides. The resulting compounds are good single source precursors for the BiFeO3 materials. The presented synthetic route can be generalized and other heterobimetallic compounds can be obtained. This work should also be helpful in the designing new precursors for synthesis of metal oxides.
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Lorenz, Michael, Gerald Wagner, Vera Lazenka, Peter Schwinkendorf, Hiwa Modarresi, Bael Margriet J. Van, André Vantomme, Kristiaan Temst, Oliver Oeckler, and Marius Grundmann. "Correlation of magnetoelectric coupling in multiferroic BaTiO3-BiFeO3 superlattices with oxygen vacancies and antiphase octahedral rotations." American Institute of Physics, 2015. https://ul.qucosa.de/id/qucosa%3A31214.

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Multiferroic (BaTiO3-BiFeO3) × 15 multilayer heterostructures show high magnetoelectric (ME) coefficients aME up to αME up to 24 V/cm·Oe at 300 K. This value is much higher than that of a single-phase BiFeO3 reference film (αME = 4.2 V/cm·Oe). We found clear correlation of ME coefficients with increasing oxygen partial pressure during growth. ME coupling is highest for lower density of oxygen vacancy-related defects. Detailed scanning transmission electron microscopy and selected area electron diffraction microstructural investigations at 300K revealed antiphase rotations of the oxygen octahedra in the BaTiO3 single layers, which are an additional correlated defect structure of the multilayers.
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Yousfi, Said. "Mécanismes de conduction et effet photovoltaïque dans des films minces de BiFeO3." Electronic Thesis or Diss., Amiens, 2018. http://www.theses.fr/2018AMIE0017.

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Le multiferroїque BiFeO3 est l'un des matériaux ferroïques les plus étudiés à ce jour du fait de la coexistence à température ambiante d'un état ferroélectrique et antiferromagnétique. Il présente de plus une réponse photovoltaïque dont l'origine précise n'est actuellement pas comprise. Le but principal de cette thèse est donc d'étudier les propriétés photovoltaïques de films épitaxiés BiFeO3. Préalablement à l'investigation des propriétés photovoltaïques une étude des mécanismes de conduction a été entreprise. Un transport polaronique de saut via les défauts les plus proches voisins a été mis en évidence et une transition est observée à 253K. En dessous de cette transition les états associés aux défauts proches du niveau de Fermi contribuent principalement et une longueur de saut variable émerge. Cette observation semble être corrélée à la réponse photovoltaïque avec un changement de régime de la tension photo-induite autour de 253K. Cette réponse photovoltaïque est provoquée par l'état ferroélectrique et peut être basculée à l'aide d'un champ électrique. Afin de reproduire artificiellement l'état en domaines associé à l'effet photovoltaïque de BiFeO3 des super-réseaux BiFeO3/SrRuO3 ont été fabriqués et une étude préliminaire de la structure a été entreprise. Nous observons un changement structural d'une phase rhomboédrique vers une phase pseudo quadratique dans ces super-réseaux de période variable et attribuons cette transition à l'influence prépondérante des contraintes élastiques induites dans le plan
The multiferroic BiFeO3 is one of the most studied material because of the room temperature coexisting ferroelectric and antiferromagnetic state. It also shows a photovoltaic response not yet understood. The main objective of this thesis is therefore to investigate the the photovoltaic properties of epitaxial BiFeO3 thin films. Preliminary to photovoltaic studies an investigation of the conduction mechanism has been performed. A polaronic transport with next nearest hopping mechanism is evidenced with a change of regime below 253K. Below 253K variable range hopping transport is observed and involves defects states near the Fermi level. This transport behavior seems connected to the photovoltaic response and change observed at 253K in the photo-induced voltage. Interestingly the photovoltaic response is induced by the ferroelectric state and we demonstrate a switchable photovoltaic effect by an applied electric field. In order to artificially reproduce the domain structure involved in the photovoltaic effect in BiFeO3 BiFeO3/SrRuO3 superlattices have been fabricated and a preliminary structural investigation is presented. A structural change is evidenced from a rhombohedral structure to pseudo-tetragonal state in the superlattices with variable periodicities and we attribute this transition to the influence of the induced in-plane elastic strain
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Jarrier, Romain. "Influence de la stœchiométrie sur les propriétés physiques du multiferroïque BiFeO3." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00676879.

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Le matériau BiFeO3 (BFO) est le sujet de très nombreuses études fondamentales dans le domaine des matériaux multiferroïques. Cet intérêt est du au fait que cet oxyde présente deux ordres à longue distance à la température ambiante : ferroélectricité et antiferromagnétisme de type G (ce dernier est aussi non colinéaire avec la présence de faible ferromagnétisme ainsi qu'une modulation de spin de type cycloïdale possédant une longueur d'onde de 620 angstrœm). Il est alors possible d'étudier les comportements de couplage entre les propriétés électrique et magnétique. Ce travail concerne principalement la synthèse, les structures haute température, et les propriétés physiques (électronique et magnétique principalement) du matériau BiFeO3 ayant subi des recuits de différentes pressions partielles d'oxygène. La première étape de ce travail concerne l'étude de la synthèse afin de déterminer le protocole optimal de réalisation des céramiques. Les recuits sous atmosphère ont eu pour but de modifier la stœchiométrie en oxygène du matériau, afin d'affecter ses propriétés physiques. Des modifications de faible amplitude de certaines propriétés ont été détectées, mais à l'inverse, la température de Néel et la température de Curie ne sont pas affectées.Concernant la nature des structures haute température, les phases beta et gamma, sujettes à de nombreuses controverses dans la littérature, ont été étudiées par diffraction des rayons X et analyse DSC sur BFO pur ou avec excès de bismuth. Cet excès a permis de stabiliser la phase gamma entre 940 et 950°C, en évitant sa décomposition. Pour compléter ce travail sur BFO en phase pure, nous avons dopé des céramiques avec 10 % de Zr4+ pour étudier le comportement structurale à haute température, ainsi que les propriétés magnétiques et électriques de cette nouvelle composition. Enfin, des simulations numériques sur le composé stœchiométrique, lacunaire en bismuth ou en oxygène ont été réalisées pour comprendre les évolutions structurale, électronique et magnétique du matériau suite aux recuits. La dernière partie est une étude sur le comportement basse température de BFO pur sous différentes formes : nanotubes, céramiques et monocristaux. Nous avons analysé le comportement électrique (impédance, pyroélectricité, RPE et électrostriction), magnétique (aimantation en fonction de la température et du champ magnétique) et structurale (rayon X en thêta-2thêta et rasant, DSC, microRaman et résonance d'ultrasons). Suite à ces études, trois températures sont observées comme présentant un comportement particulier : 140 et 200 K, qui semblent liées par de nombreuses techniques d'analyses et ressortent comme étant une transition à la surface de BFO, mais aussi 180 K où nous avons un écart à la linéarité de la dilatation thermique et un effet d'électrostriction.
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Kavanagh, Christopher M. "Synthesis and structure-property relationships in rare earth doped bismuth ferrite." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3555.

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There has been significant interest in BiFeO₃ over the past decade. This interest has focused on the magnetic and electrical properties, which in the long term may prove useful in device applications. This thesis focuses on the synthesis, electrical characterisation, and structural origin of the electrical properties of rare earth doped bismuth ferrite. Two systems have been studied: BiFeO₃ doped with lanthanum and neodymium (Bi₁₋ₓREₓFeO₃ RE= La, Nd). Specific examples have been highlighted focusing on a detailed structural analysis of a lanthanum doped bismuth ferrite, Bi₀.₅La₀.₅FeO₃, and a neodymium analogue, Bi₀.₇Nd₀.₃FeO₃. Both adopt an orthorhombic GdFeO₃-type structure (space group: Pnma) with G-type antiferromagnetism. Structural variations were investigated by Rietveld refinement of temperature dependent powder neutron diffraction using a combination of both conventional “bond angle/bond length” and symmetry-mode analysis. The latter was particularly useful as it allowed the effects of A-site displacements and octahedral tilts/distortions to be considered separately. This in-depth structural analysis was complemented with ac-immittance spectroscopy using the multi-formulism approach of combined impedance and modulus data to correlate structural changes with the bulk electrical properties. This approach was essential due to the complex nature of the electrical response with contributions from different electroactive regions. The structural variations occur due to a changing balance between magnetic properties and other bonding contributions in the respective systems. This results in changes in the magnitude of the octahedral tilts, and A-site displacements giving rise to phenomena such as negative thermal expansion and invariant lattice parameters i.e., the invar effect. More specifically, analysis of Bi₀.₅La₀.₅FeO₃ highlights a structural link between changes in the relative dielectric permittivity and changes in the FeO₆ octahedral tilt magnitudes, accompanied by a structural distortion of the octahedra with corresponding A-site displacement along the c-axis; this behaviour is unusual due to an increasing in-phase tilt mode with increasing temperature. The anomalous orthorhombic distortion is driven by magnetostriction at the onset of antiferromagnetic ordering resulting in an Invar effect along the magnetic c-axis and anisotropic displacement of the A-site Bi³⁺ and La³⁺ along the a-axis. This contrasts with the neodymium analogue Bi₀.₇Nd₀.₃FeO₃ in which a combination of increasing A-site displacements in the ac-plane and decrease in both in-phase and anti-phase tilts combine with superexchange giving rise to negative thermal expansion at low temperature. The A-site displacements correlate with the orthorhombic strain. By carefully changing the synthesis conditions, a significant change in bulk conductivity was observed for a number for Bi₁₋ₓLaₓFeO₃ compositions. A series of Bi₀.₆La0.₄FeO₃ samples are discussed, where changes in the second step of the synthesis result in significantly different bulk conductivities. This behaviour is also observed in other compositions e.g. Bi₀.₇₅La₀.₂₅FeO₃. Changes in the electrical behaviour as a function of temperature are discussed in terms of phase composition and concentration gradients of defects. Activation energies associated with the conduction process(es) in Bi₁₋ₓLaₓFeO₃ samples, regardless of composition, fall within one of two broad regimes, circa. 0.5 eV or 1.0 eV, associated with polaron hopping or migration of charge via oxygen vacancies, respectively. The use of symmetry-mode analysis, in combination with conventional crystallographic analysis and electrical analysis using multi-formulism approach, presents a new paradigm for investigation of structure-property relationships in rare earth doped BiFeO₃.
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Book chapters on the topic "The multiferroic BiFeO3":

1

Guerra, J. D. S., Madhuparna Pal, G. S. Dias, I. A. Santos, R. Guo, and A. S. Bhalla. "Low Temperatures Dielectric Anomaly in BiFeO3 -Based Multiferroic Ceramics." In Processing and Properties of Advanced Ceramics and Composites VII, 77–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119183860.ch9.

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Muneeswaran, Muniyandi, Mayakrishnan Gopiraman, Shanmuga Sundar Dhanabalan, N. V. Giridharan, and Ali Akbari-Fakhrabadi. "Multiferroic Properties of Rare Earth-Doped BiFeO3 and Their Spintronic Applications." In Metal and Metal Oxides for Energy and Electronics, 375–95. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53065-5_11.

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Doley, Hage, Anuradha Panigrahi, and Pinaki Chakraborty. "Study of Electrical and Magnetic Properties of Multiferroic Composite (BiFeO3)x(Ba5RTi3V7O30)1−x." In Advances in Intelligent Systems and Computing, 451–59. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3329-3_42.

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Thota, Harikishan, Ashish Garg, Brajesh Pandey, and H. C. Verma. "Effect of cooling conditions on the magnetic structure of multiferroic BiFeO3 synthesized by mechanical activation." In ICAME 2007, 1167–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78697-9_160.

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Khasbulatov, S. V., L. A. Shilkina, S. I. Dudkina, A. A. Pavelko, K. P. Andryushin, S. N. Kallaev, G. G. Gadjiev, et al. "Crystal Structure, Dielectric and Thermophysical Properties of Multiferroics BiFeO3/REE." In Springer Proceedings in Physics, 305–17. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19894-7_23.

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Raevskaya, S. I., S. P. Kubrin, A. V. Pushkarev, N. M. Olekhnovich, Y. V. Radyush, V. V. Titov, H. Chen, et al. "The Effect of Cr-Doping on the Structure, Dielectric and Magnetic Properties of BiFeO3 and Pb(Fe0.5Sb0.5)O3 Multiferroics." In Springer Proceedings in Physics, 195–208. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78919-4_16.

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Chand Verma, Kuldeep. "Synthesis and Characterization of Multiferroic BiFeO3 for Data Storage." In Bismuth - Fundamentals and Optoelectronic Applications. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94049.

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Multiferroic BiFeO3 deals with spintronic devices involved spin-charge processes and applicable in new non-volatile memory devices to store information for computing performance and the magnetic random access memories storage. Since multiferroic leads to the new generation memory devices for which the data can be written electrically and read magnetically. The main advantage of present study of multiferroic BiFeO3 is that to observe magnetoelectric effects at room temperature. The nanostructural growth (for both size and shape) of BiFeO3 may depend on the selection of appropriate synthesis route, reaction conditions and heating processes. In pure BiFeO3, the ferroelectricity is induced by 6s2 lone-pair electrons of Bi3+ ions and the G-type antiferromagnetic ordering resulting from Fe3+ spins order of cycloidal (62-64 nm wavelength) occurred below Neel temperature, TN = 640 K. The multiferroicity of BiFeO3 is disappeared due to factors such as impurity phases, leakage current and low value of magnetization. Therefore, to overcome such factors to get multiferroic enhancement in BiFeO3, there are different possible ways like changes dopant ions and their concentrations, BiFeO3 composites as well as thin films especially multilayers.
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Chand Verma, Kuldeep, and Manpreet Singh. "Processing Techniques with Heating Conditions for Multiferroic Systems of BiFeO3, BaTiO3, PbTiO3, CaTiO3 Thin Films." In Thermoelectricity [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.101122.

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In this chapter, we have report a list of synthesis methods (including both synthesis steps & heating conditions) used for thin film fabrication of perovskite ABO3 (BiFeO3, BaTiO3, PbTiO3 and CaTiO3) based multiferroics (in both single-phase and composite materials). The processing of high quality multiferroic thin film have some features like epitaxial strain, physical phenomenon at atomic-level, interfacial coupling parameters to enhance device performance. Since these multiferroic thin films have ME properties such as electrical (dielectric, magnetoelectric coefficient & MC) and magnetic (ferromagnetic, magnetic susceptibility etc.) are heat sensitive, i.e. ME response at low as well as higher temperature might to enhance the device performance respect with long range ordering. The magnetoelectric coupling between ferromagnetism and ferroelectricity in multiferroic becomes suitable in the application of spintronics, memory and logic devices, and microelectronic memory or piezoelectric devices. In comparison with bulk multiferroic, the fabrication of multiferroic thin film with different structural geometries on substrate has reducible clamping effect. A brief procedure for multiferroic thin film fabrication in terms of their thermal conditions (temperature for film processing and annealing for crystallization) are described. Each synthesis methods have its own characteristic phenomenon in terms of film thickness, defects formation, crack free film, density, chip size, easier steps and availability etc. been described. A brief study towards phase structure and ME coupling for each multiferroic system of BiFeO3, BaTiO3, PbTiO3 and CaTiO3 is shown.
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"First-Principles Calculations for Multiferroic BiFeO3." In Multiferroic Materials, 297–316. Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017] |: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372532-20.

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Seidel, J., and R. Ramesh. "Electronics Based on Domain Walls." In Domain Walls, 340–50. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862499.003.0015.

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This chapter reviews some of the initial developments and recently introduced potential application concepts related to domain walls in ferroelectrics and multiferroics. It gives a special (non-exclusive) focus on the heavily investigated bismuth ferrite BiFeO3 system as one of the rare examples of a single phase room-temperature multiferroic system that can be widely tailored in application relevant epitaxial thin films. Here, DWs as well as other topological structures reveal new ways to novel tailored states of matter with a wide range of electronic properties. Domain wall electronics, particularly with ferroelectrics and multiferroics, provides new nanotechnological concepts for identifying, understanding, and designing new material properties. However, this chapter observes that there has been very little work done on controlling electronic correlations.

Conference papers on the topic "The multiferroic BiFeO3":

1

Rader, Claire, Megan F. Nielson, Brittany E. Knighton, Aldair Alejandro, and Jeremy A. Johnson. "2D THz Measurement of Magnon-Phonon Coupling in Multiferroic BiFeO3." In CLEO: Fundamental Science. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_fs.2023.ff1g.4.

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With 2D THz spectroscopy we directly measure magnon-phonon coupling in multiferroic BiFeO3. Using theoretical modeling, we are able to decipher different types of coupling that appear in 2D spectral features.
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Song, Wei, Dong Zhang, Zhi Sun, Bai Han, Li-juan He, Xuan Wang, and Qing-quan Lei. "Preparation and characterization of multiferroic BiFeO3." In 2012 IEEE 10th International Conference on the Properties and Applications of Dielectric Materials (ICPADM). IEEE, 2012. http://dx.doi.org/10.1109/icpadm.2012.6318899.

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Khomchenko, V. A., N. A. Sobolev, M. Kopcewicz, M. Maglione, and Y. G. Pogorelov. "Heterovalent A-site doping of multiferroic BiFeO3." In 2008 17th IEEE International Symposium on the Applications of Ferroelectrics (ISAF). IEEE, 2008. http://dx.doi.org/10.1109/isaf.2008.4693778.

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Paul, Pralay, Tuhin Kumar Maji, Krishna Kanhaiya Tiwari, Balaji Mandal, A. K. Rajarajan, Ranu Bhatt, Debjani Karmakar, and T. V. C. Rao. "Theoretical and experimental study of multiferroic BiFeO3." In DAE SOLID STATE PHYSICS SYMPOSIUM 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4980778.

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Knighton, Brittany E., Megan F. Nielson, Aldair Alejandro, Lauren M. Davis, R. Tanner Hardy, Min-Cheol Lee, Aiping Chen, Rohit P. Prasankumar, and Jeremy A. Johnson. "Two-dimensional THz Spectroscopy of Multiferroic BiFeO3." In 2020 45th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). IEEE, 2020. http://dx.doi.org/10.1109/irmmw-thz46771.2020.9370699.

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Rieck, Jan, Cynthia Quinteros, Mart Salverda, and Beatriz Noheda. "Multiferroic BiFeO3 Domain Walls as Memristive Devices." In Materials, devices and systems for neuromorphic computing 2022. València: Fundació Scito, 2022. http://dx.doi.org/10.29363/nanoge.matnec.2022.016.

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I-Wei Chu, Kai Su, Ronald Pirich, and Nan-Loh Yang. "Three approaches for the synthesis of multiferroic BiFeO3." In 2010 IEEE Long Island Systems, Applications and Technology Conference. IEEE, 2010. http://dx.doi.org/10.1109/lisat.2010.5478337.

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Piccone, B. E., J. E. Blendell, and R. E. Garcia. "Response surface measurement for BiFeO3-CoFe2O4 multiferroic nanocomposite." In 2008 17th IEEE International Symposium on the Applications of Ferroelectrics (ISAF). IEEE, 2008. http://dx.doi.org/10.1109/isaf.2008.4693782.

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Katoch, Rajesh, Rajeev Gupta, and Ashish Garg. "Structural investigation of multiferroic BiFeO3-PbTiO3 solid solution." In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4873102.

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Sheikh, Javed R., Vishwajit M. Gaikwad, and Smita A. Acharya. "Investigation of multiferroic behavior on flakes-like BiFeO3." In DAE SOLID STATE PHYSICS SYMPOSIUM 2015. Author(s), 2016. http://dx.doi.org/10.1063/1.4948196.

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