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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Zhao, Li, Maria Teresa Fernández-Díaz, Liu Hao Tjeng et Alexander C. Komarek. « Oxyhalides : A new class of high-TC multiferroic materials ». Science Advances 2, no 5 (mai 2016) : e1600353. http://dx.doi.org/10.1126/sciadv.1600353.

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Magnetoelectric multiferroics have attracted enormous attention in the past years because of their high potential for applications in electronic devices, which arises from the intrinsic coupling between magnetic and ferroelectric ordering parameters. The initial finding in TbMnO3 has triggered the search for other multiferroics with higher ordering temperatures and strong magnetoelectric coupling for applications. To date, spin-driven multiferroicity is found mainly in oxides, as well as in a few halogenides. We report multiferroic properties for synthetic melanothallite Cu2OCl2, which is the first discovery of multiferroicity in a transition metal oxyhalide. Measurements of pyrocurrent and the dielectric constant in Cu2OCl2 reveal ferroelectricity below the Néel temperature of ~70 K. Thus, melanothallite belongs to a new class of multiferroic materials with an exceptionally high critical temperature. Powder neutron diffraction measurements reveal an incommensurate magnetic structure below TN, and all magnetic reflections can be indexed with a propagation vector [0.827(7), 0, 0], thus discarding the claimed pyrochlore-like “all-in–all-out” spin structure for Cu2OCl2, and indicating that this transition metal oxyhalide is, indeed, a spin-induced multiferroic material.
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Liu, Sheng, Feng Xiang, Yulan Cheng, Yajun Luo et Jing Sun. « Multiferroic and Magnetodielectric Effects in Multiferroic Pr2FeAlO6 Double Perovskite ». Nanomaterials 12, no 17 (30 août 2022) : 3011. http://dx.doi.org/10.3390/nano12173011.

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Single-phase multiferroics that allow the coexistence of ferroelectric and magnetic ordering above room temperature are highly desirable, and offer a fundamental platform for novel functionality. In this work, a double perovskite multiferroic Pr2FeAlO6 ceramic is prepared using a sol-gel process followed by a quenching treatment. The well-crystallized and purified Pr2FeAlO6 in trigonal structure with space group R3c is confirmed. A combination of the ferroelectric (2Pr = 0.84 μC/cm2, Ec = 7.78 kV/cm at an applied electric field of 20 kV/cm) and magnetic (2Mr = 433 memu/g, Hc = 3.3 kOe at an applied magnetic field of 1.0 T) hysteresis loops reveals the room-temperature multiferroic properties. Further, the magnetoelectric effect is observed from the measurements of magnetically induced dielectric response and polarization. The present results suggest a new complex oxide candidate for room-temperature multiferroic applications.
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Díaz-Moreno, Carlos A., Jorge A. López, Yu Ding, A. Hurtado Macias, Chunqiang Li et Ryan B. Wicker. « Multiferroic and Optical Properties of La0.05Li0.85NbO3 and LiNbO3 Nanocrystals ». Journal of Nanotechnology 2018 (3 septembre 2018) : 1–13. http://dx.doi.org/10.1155/2018/3721095.

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The chemistry and physics of surfaces is an increasingly important subject. The study of surfaces is the key of many important nanotechnological applications due to the understanding of phase transitions, electronic structure, and chemical bonding. In later years, exotic phenomena that jointly involve the magnetic and electrical conductivity properties have been discovered in oxides that contain magnetic ions. Moreover, the uses of magnetic oxides in electronic technology have become so important due to the miniaturization of devices and magnetic materials with dielectric properties or vice versa being required for inductors, information storage, thin films for high-density computer memories, microwave antireflection coatings, and permanent magnets for automobile ignitions among others. On the contrary, nanotechnology developments over 10 years or so have provided intensive studies in trying to combine properties such as ferroelectric, ferromagnetic, and optics in one single-phase nanoparticles or in composite thin films; this last effort has been recently known as multiferroic. Because of this, the resurgence of nanomaterials with multiferroic and optical properties is presented in this work of one single phase in lanthanum lithium niobate (La0.05Li0.85NbO3) and lithium niobate (LiNbO3) with ferromagnetic, ferroelectric, relaxor ferroelectricity, second harmonic generation, high-temperature ferromagnetic, and magnetoelectric properties.
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Skulski, Ryszard, Dariusz Bochenek, Przemysław Niemiec, Dagmara Brzezinska et Artur Chrobak. « Technology and Main Properties of PMN-PT-Ferrite Multiferroic Ceramic Composite Materials ». Advances in Science and Technology 98 (octobre 2016) : 3–8. http://dx.doi.org/10.4028/www.scientific.net/ast.98.3.

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In the presented work composite ferroelectric/ferrimagnetic ceramics have been obtained and described. The investigated material is based on PMN-PT powders and Ni-Zn ferrite powder. The Powders of ferroelectric component (i.e. (1–x)PMN-(x)PT with x from 0.25 to 0.40 with step 0.03 were synthesized using the sol-gel method. The magnetic component i.e. nickel-zinc ferrite was obtained from oxides using the classic method of obtaining ceramics. The compositions of PMN–PT used by us have rhombohedral or tetragonal symmetries, or belong to morphotropic region. The final ceramic composite samples were obtained using the classic method of ceramic technology with calcination route and final pressureless densification using free sintering. In this paper, XRD, EDS dielectric and magnetic properties have been investigated and described for the obtained composite ceramic samples.
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5

Dash, Swagatika, R. N. P. Choudhary, Piyush R. Das et Ashok Kumar. « Structural, dielectric, and multiferroic properties of (Bi0.5K0.5)(Fe0.5Nb0.5)O3 ». Canadian Journal of Physics 93, no 7 (juillet 2015) : 738–44. http://dx.doi.org/10.1139/cjp-2014-0025.

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A polycrystalline sample of (Bi0.5K0.5)(Fe0.5Nb0.5)O3 was prepared using a mixed oxide at 1000 °C. The preliminary structural analysis using X-ray diffraction data of the compound indicates the formation of a single-phase rhombohedral structure similar to that of parent BiFeO3. Microstructural and elemental analysis using a scanning electron micrograph and energy-dispersive X-ray spectroscopy, respectively, were carried out at room temperature with higher magnification exhibiting a uniform distribution of grains and stoichiometry. The appearance of hysteresis loops (P–E) confirms the existence of ferroelectricity of the sample with a high remnant polarization of (2Pr) 17.76 μCcm−2. Using impedance spectroscopy, the electrical properties of the material were investigated at a wide range of temperature (25–500 °C) and frequencies (1 kHz – 1 MHz) suggesting dielectric non-Debye-type relaxation in the material. The nature of the Nyquist plot ([Formula: see text] ∼ [Formula: see text]) shows the dominance of the grain contribution in the impedance. The bulk resistance of the compound decreases with increasing temperature, like that of a semiconductor, which shows a negative temperature coefficient of resistance (NTCR) behavior. The frequency dependence of AC conductivity suggests that that the material obeys Jonscher’s power law. Magnetic hysteresis (M–H) loop shows very weak ferromagnetic behavior at room temperature.
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Pattanayak, Samita, R. N. P. Choudhary et Piyush R. Das. « Studies of electrical conductivity and magnetic properties of Bi1-xGdxFeO3 multiferroics ». Journal of Advanced Dielectrics 04, no 02 (avril 2014) : 1450011. http://dx.doi.org/10.1142/s2010135x14500118.

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The polycrystalline samples of Bi 1-x Gd x FeO 3 (x = 0, 0.1, and 0.2) multiferroic oxides have been synthesized by a solid-state reaction/mixed oxide technique. The preliminary X-ray structural analysis with room temperature diffraction data confirmed the formation of single-phase systems. Study of room temperature scanning electron micrograph (SEM) of the surface of the above samples exhibits a uniform distribution of plate- and rod-shaped grains throughout the sample surface with less porosity. The dielectric behavior of the materials was studied in a wide range of frequency (1 kHz–1 MHz) and temperature (30–400°C). The nature of temperature dependence of dc conductivity confirms the Arrhenius behavior of the materials. The frequency–temperature dependence of ac conductivity suggests that the material obeys Jonscher's universal power law. An increase in Gd -content results in the enhancement of spontaneous magnetization BiFeO 3 (BFO) due to the collapse of spin cycloid structure. The magnetoelectric coupling coefficient of BFO has been enhanced on Gd -substitution.
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Zhou, Ziyao, Qu Yang, Ming Liu, Zhiguo Zhang, Xinyang Zhang, Dazhi Sun, Tianxiang Nan, Nianxiang Sun et Xing Chen. « Antiferroelectric Materials, Applications and Recent Progress on Multiferroic Heterostructures ». SPIN 05, no 01 (mars 2015) : 1530001. http://dx.doi.org/10.1142/s2010324715300017.

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Antiferroelectric (AFE) materials with adjacent dipoles oriented in antiparallel directions have a double polarization hysteresis loops. An electric field (E-field)-induced AFE–ferroelectric (FE) phase transition takes place in such materials, leading to a large lattice strain and energy change. The high dielectric constant and the distinct phase transition in AFE materials provide great opportunities for the realization of energy storage devices like super-capacitors and energy conversion devices such as AFE MEMS applications. Lots of work has been done in this field since 60–70 s. Recently, the strain tuning of the spin, charge and orbital orderings and their interactions in complex oxides and multiferroic heterostructures have received great attention. In these systems, a single control parameter of lattice strain is used to control lattice–spin, lattice–phonon, and lattice–charge interactions and tailor properties or create a transition between distinct magnetic/electronic phases. Due to the large strain/stress arising from the phase transition, AFE materials are great candidates for integrating with ferromagnetic (FM) materials to realize in situ manipulation of magnetism and lattice-ordered parameters by voltage. In this paper, we introduce the AFE material and it's applications shortly and then review the recent progress in AFEs based on multiferroic heterostructures. These new multiferroic materials could pave a new way towards next generation light, compact, fast and energy efficient voltage tunable RF/microwave, spintronic and memory devices promising approaches to in situ manipulation of lattice-coupled order parameters is to grow epitaxial oxide films on FE/ferroelastic substrates.
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8

Moustafa, A. M., S. A. Gad, G. M. Turky et L. M. Salah. « Structural, Magnetic, and Dielectric Spectroscopy Investigations of Multiferroic Composite Based on Perovskite–Spinel Approach ». ECS Journal of Solid State Science and Technology 11, no 3 (1 mars 2022) : 033008. http://dx.doi.org/10.1149/2162-8777/ac5c7d.

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Multiferroic composite materials with the nominal composition (La0.8Gd0.2FeO3)1−x(Mn0.5Cu0.5Fe2O4)x, x = 0.0≤x≤1 were prepared using the co-precipition method. XRD, FTIR and Raman were utilized to investigate the structure phase, microstructural characteristics, vibrational bands. The optical properties were analyzed; the VSM was used to investigate the magnetic properties of the composites. Broadband dielectric spectroscopy is employed to investigate the dielectric and electrical performance of the prepared multiferroic composites. Rietveld refinement of the XRD patterns confirmed the orthorhombic phase for lanthanum gadolinium iron oxide (La0.8Gd0.2FeO3) and cubic phase for manganese copper ferrite (Mn0.5Cu0.5Fe2O4). The crystallite size of LGFO phase pointed out that it increases with increasing the MCFO phase, while the microstrain found to decline. The FTIR results elucidated the tetrahedral and octahedral bands. The deduced optical properties revealed that the samples have optical energy gap in the range 4.18 −4.5 eV. The magnetic properties revealed that the composites exhibit typical ferromagnetic hysteresis loops, indicating the presence of ordered magnetic structure. The frequency dependence of permittivity ε′(f) and real part of complex conductivity, σ′(f) exhibits a development of a net of micro-capacitors like behavior that stores charge carriers.
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9

Algueró, Miguel, Rafael P. del Real, Harvey Amorín et Alicia Castro. « Coexisting magnetic orders and concomitant Morin-like transition and relaxor behavior in multiferroic Aurivillius Bi4Ti3 − 2xNbxFexO12 compounds ». Applied Physics Letters 121, no 12 (19 septembre 2022) : 122904. http://dx.doi.org/10.1063/5.0097079.

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Aurivillius layered oxides with general formula (Bi2O2)(Am−1BmO3m+1) stand out among room-temperature magnetoelectric multiferroics for their large magnetization. However, despite extensive research, there is an obvious lack of understanding of their magnetism. The chemical design strategy for obtaining multiferroism involves the incorporation of M3+ magnetic cations at the B-site of well-known ferroelectric compounds such as Bi4Ti3O12 (m = 3). We report here a study of the magnetism and dielectric properties of Aurivillius Bi4Ti3 − 2xNbxFexO12 phases with x ≥ 1 up to 1.2, which correspond to magnetic cation fractions at the B site between 0.33 and 0.4 above the threshold for percolation. This is a three-layer system, less prone to the formation of intergrowths, which nominally contains Fe3+ as single magnetic species. Despite that, a rich phenomenology is uncovered. Coexisting magnetic orders are present in the Aurivillius compounds, and a Morin-like transition takes place at low temperatures. The dielectric characterization does not show any associated anomaly that could indicate a polymorphic phase transition but the appearance of relaxor-like characteristics. Possible scenarios are discussed, which involve the presence of Fe2+, cation partitioning between nonequivalent B-sites, and the development of polar nanodomains within a ferroelectric phase at a spin reorientation transition.
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10

Zhang, Xiao Yan, Xi Wei Qi, Jian Quan Qi et Xuan Wang. « Preparation and Properties of Multiferroic La-Doped BiFeO3 Thin Film ». Advanced Materials Research 486 (mars 2012) : 417–21. http://dx.doi.org/10.4028/www.scientific.net/amr.486.417.

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Multiferroic La-doped Bi1-xLaxFeO3 thin films were prepared on conductive indium tin oxide (ITO)/glass substrates through a simple sol-gel process. The crystal structure of La-doped Bi1-xLaxFeO3 thin films annealed at different temperature was determined to be rhombohedral of R3m space and free of secondary phases. The grain size of La-doped BiFeO3 thin films tends to become larger and the grain boundary is gradually ambiguous compared to pure BiFeO3. The double remanent polarization 2Pr of Bi0.9La0.1FeO3 thin film annealed at 500°C is 6.66 µC/cm2, which is slightly improved than that of pure BiFeO3 thin film. With the increase of La-doping levels, the dielectric constant is increased and the dielectric loss is obviously decreased.
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11

Gomi, Manabu, K. Ban, Naoya Nishimura et Takeshi Yokota. « Magnetoelectric Effect in Multiferroic Perovskite-Oxide Composites ». Advances in Science and Technology 45 (octobre 2006) : 2514–19. http://dx.doi.org/10.4028/www.scientific.net/ast.45.2514.

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Magnetic, dielectric properties and magnetoelectric effect of ceramics with a composition of 0.9 BaTiO3-0.1 LaMnO3 have been investigated. X-ray diffraction measurements showed that the sintered ceramics are composites containing a small amount of (La, Ba)MnO3 phase in the BaTiO3 matrix. These composites were multiferroic, having ferromagnetic and ferroelectric Curie temperatures of 330 K and 392 K respectively. We found that the composite sintered at 1150 °C exhibits a reduction of spontaneous magnetization as large as 55 % at room temperature when an electric field of 1.4 KV/mm is applied. This reduction is probably ascribed to a change of hole concentration distribution in the precipitated ferromagnetic (La, Ba)MnO3 and the resultant decrease of ferromagnetic Curie temperature.
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12

Awan, M. S., A. S. Bhatti, S. Qing et C. K. Ong. « Tailoring of Multiferroic Properties of BiFeO3 Thin Films by Cation Substitution ». Key Engineering Materials 442 (juin 2010) : 102–8. http://dx.doi.org/10.4028/www.scientific.net/kem.442.102.

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Mn-doped multiferroic BiFeO3 (BFMO) thin films were deposited on LaNiO3(LNO)/SrTiO3(STO)/Si(100) substrates by pulsed laser deposition (PLD) technique. X-ray diffraction (XRD) showed that films were bicrystalline single phase with (110) preferential orientation. Multiferroic top layer and oxide bottom electrode (LNO) epitaxially followed the buffer layer (STO). Oxygen partial pressure during deposition proved to be critical for phase formation, crystallinity and resistivity of the films. Atomic force microscopic (AFM) studies revealed the smooth, dense and crack free surfaces of the films. Cross-section view of the multilayers by field emission scanning electron microscope (FE-SEM) gave their thickness. Mn substitution resulted in the increase of magnetization saturation, coercive field and clarity of hysteresis loop. The magneto-electric (ME) effect was demonstrated by measuring the dielectric response in a varying magnetic field. Optimally deposited BFMO films show saturated P-E loop.
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Wodecka-Duś, Beata, Lucjan Kozielski, Jolanta Makowska, Mateusz Bara et Małgorzata Adamczyk-Habrajska. « Fe-Doped Barium Lanthanum Titanate as a Competitor to Other Lead-Free Piezoelectric Ceramics ». Materials 15, no 3 (30 janvier 2022) : 1089. http://dx.doi.org/10.3390/ma15031089.

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Multiferroic solid solutions of Ba1−xLaxTi1−x/4O3 and iron (BLFT) were synthesized using the conventional mixed oxide method. The dependence of the piezoelectric coefficients on Fe content in BLFT ceramics was determined by the quasi-static and resonance method. The results indicate that 0.3 mol% addition of Fe3+ ions to the ceramic structure increased the value of the piezoelectric parameter d33 to the maximum of 159 pC/N. This puts BLFT ceramics among other good-quality and lead-free piezoelectric ceramics. A major enhancement of dielectric properties related to the manipulation of Fe content in the barium lanthanum titanate (BLT) ceramics system is reported as well.
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Kumari, Kalpana. « Magnetic and dielectric properties of Fe3BO6 nanoplates prepared through self-combustion method ». Journal of Advanced Dielectrics 07, no 06 (décembre 2017) : 1750043. http://dx.doi.org/10.1142/s2010135x17500436.

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In the present investigation, a facile synthesis method is explored involving a self-combustion of a solid precursor mixture of iron oxide Fe2O3 and boric acid (H3BO3) using camphor (C[Formula: see text]H[Formula: see text]O) as fuel in ambient air in order to form a single phase Fe3BO6 crystallites. X-ray diffraction (XRD), Field emission electron microscopy (FESEM), magnetic, and dielectric properties of as prepared sample are studied. From XRD pattern, a single phase compound is observed with an orthorhombic crystal structure (Pnma space group), with average crystallite size of 42[Formula: see text]nm. A reasonably uniform size distribution of the plates and self-assemblies is retained in the sample. A magnetic transition is observed in dielectric permittivity (at [Formula: see text]445[Formula: see text]K) and power loss (at [Formula: see text]435[Formula: see text]K) when plotted against temperature. A weak peak occurs near 330[Formula: see text]K due to the charge reordering in the sample. For temperatures above the transition temperature, a sharp increase of the dielectric loss is observed which occurs due to the presence of thermally activated charge carriers. A canted antiferromagnetic Fe[Formula: see text] ordering in a Fe3BO6 lattice with a localized charge surface layer is an apparent source of exhibiting a ferroelectric feature in this unique example of a centrosymmetric compound. An induced spin current over the Fe sites thus could give rise to a polarization hysteresis loop. Due to the presence of both ferromagnetic as well as polarization ordering, Fe3BO6 behaves like a single phase multiferroic ceramics.
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Rafitasari, Yeti, Ardita Septiani, Asep Ridwan Nugraha, Ervin Naufal Arrasyid, Dedi et Agustinus Agung Nugroho. « Synthesis of Bismuth Ferrite and its Application for Oscillator Material up to 25 GHz Range ». Materials Science Forum 1028 (avril 2021) : 9–14. http://dx.doi.org/10.4028/www.scientific.net/msf.1028.9.

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Among other multiferroic materials, bismuth ferrite (BiFeO3) attracts much attention due to its room-temperature properties and its wide potential applications. However, the synthesis to obtain a single-phase material is hard to be achieved because of the volatility of bismuth oxide. In this study, the BiFeO3 powders were synthesized by using a sol-gel method from the nitrates of bismuth and iron salt with the various stoichiometric ratios between Bi and Fe of 1:1.02, 1:1, 1.02:1, and 1.03:1. The single-phase and a good stoichiometric ratio of Bi: Fe = 1:1 was obtained from the starting composition ratio of 1.03:1 with a quenching process from 550°C sintering temperature. The single-phase of BiFeO3 shows a hysteresis curve of a weak antiferromagnetic with a coercive field of about 1.38 kOe at room temperature. The measurement of microwave oscillator was measured by using a dielectric resonator from 0 to 25 GHz does not show any resonant peak.
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Jejel, C. A., A. V. Sakhnenko, I. A. Golubeva et O. V. Zotova. « RESEARCH OF THE DIELECTRIC PROPERTIES OF A COMPOSITE BASED ON THE MULTIFERROIC OF COPPER OXIDE AND FERROELECTRIC BARIUM TITANATE ». Messenger AmSU, no 89 (2020) : 52–56. http://dx.doi.org/10.22250/jasu.89.13.

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Stojanovic, Nemanja, Aleksandra Kalezic-Glisovic, Aco Janicijevic et Aleksa Maricic. « Evolution of structural and functional properties of the Fe/BaTiO3 system guided by mechanochemical and thermal treatment ». Science of Sintering 52, no 2 (2020) : 163–76. http://dx.doi.org/10.2298/sos2002163s.

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Multiferroic systems are attractive to the researches worldwide due to diversity of existing applications, as well as possible novel ones. In order to contribute to understanding of the processes that take place within the structure of such a system, we subjected it to mechanochemical activation and thermal treatment. Powdery mixtures of iron and barium titanate in a mass ratio of 30% Fe and 70% BaTiO3 were activated in a planetary ball mill for time duration of 30 to 300 min and subsequently sintered at 1200?C in the atmosphere of air. During the activation the system undergoes structural phase transitions, whereby the content of iron and its oxides changes. The highest Fe content was observed in the sample activated for 270 min, with local maxima in crystallite size and microstrain values and a minimum in dislocation density. The complex dielectric permittivity changes in the applied radio frequency field, rangingfrom 176.9 pF/m in thesample activated for 90 min to 918.1 pF/m in the sample activated for 180 min. As the frequency of the field increases, an exponential decrease in the magnetic with a simultaneous increase in the electrical energy losses is noticeable. The system exhibits ferromagnetic resonance, whereby longer activation in the mill shifts the resonant frequency to higher values. Negative electrical resistance was observed in all analyzed samples. The activation time changes both the demagnetization temperature and the Curie temperature of the samples undergoing heating and cooling cycles in the external permanent magnetic field. Curie temperature is the highest in the sample activated for 240 min. Thermal treatment increases the initial magnetization of all samples, with the most pronounced increase of ~95% in the sample activated for 300 min.
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Mazzoli, Claudio, et Paolo Ghigna. « Multiferroic Properties In Complex Oxides ». Current Inorganic Chemistry 3, no 1 (1 février 2013) : 70–74. http://dx.doi.org/10.2174/1877944111303010007.

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Ahmad, Javed, Shoaib Hassan, Jamshaid Alam Khan, Umair Nissar et Hammad Abbas. « Insight into Structural and Optical Properties of Pristine and Sr2+ Doped La2NiMnO6 ». Proceedings of the Pakistan Academy of Sciences : A. Physical and Computational Sciences 58, no 2 (27 décembre 2021) : 59–71. http://dx.doi.org/10.53560/ppasa(58-2)610.

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Double perovskites oxide (DPO) multiferroics La2-xSrxNiMnO6(x=0.0, 0.1, 0.2, 0.4, 0.6) are synthesized by sol-gel technique. The structural, optical and electrical (both DC and AC) properties of La2-xSrxNiMnO6 have been investigated by XRD and FTIR spectroscopy and two-probe resistivity and dielectric measurements as a function of temperature, respectively. The effect of doping of Strontium at A-site in double perovskites is discussed. XRD has revealed the formation of monoclinic structure of La2-xSrxNiMnO6 with space group P21 / n for x=0.0 and P21 for x=0.1, 0.2, 0.4, 0.6. The average crystallite size has been calculated to be in the range 31 to 46 nm as determined by Debye Scherrer equation. Infrared active optical phonons observed from reflectivity spectra have been analysed fitting the theoretical oscillators using Lorentz oscillator model. We have observed several well-resolved phonon modes in La2-xSrxNiMnO6 with increasing dopant concentration. Activation energy calculated using Arrhenius Plot is in the range of 0.31 to 0.18 eV, confirming the semiconducting nature of all samples. The dielectric constant and tangent loss as a function of temperature and frequency are also discussed for these multiferroics.
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Lu, Yalin, et R. J. Knize. « a-b Plane Dielectric Discussion on Layered Multiferroic Oxides ». PIERS Online 6, no 3 (2010) : 201–3. http://dx.doi.org/10.2529/piers090908175250.

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Singh, Gulab, H. P. Bhasker, R. P. Yadav, Aditya Kumar, Bushra Khan, Ashok Kumar et Manoj K. Singh. « Magneto-dielectric and multiferroic properties in Bi0.95Yb0.05Fe0.95Co0.05O3 ». Physica Scripta 94, no 6 (2 avril 2019) : 065802. http://dx.doi.org/10.1088/1402-4896/ab03a5.

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Hsu, H. C., C. D. Yang, W. Y. Tseng, H. C. Ku et Y. Y. Hsu. « Magnetic and dielectric properties of multiferroic Tb0.5Eu0.5MnO3 ». Journal of Physics : Conference Series 273 (1 janvier 2011) : 012114. http://dx.doi.org/10.1088/1742-6596/273/1/012114.

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Goian, Veronica, Stanislav Kamba, Přemysl Vaněk, Maxim Savinov, Christelle Kadlec et Jan Prokleška. « Magnetic and dielectric properties of multiferroic Eu0.5Ba0.25Sr0.25TiO3ceramics ». Phase Transitions 86, no 2-3 (février 2013) : 191–99. http://dx.doi.org/10.1080/01411594.2012.727261.

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Ti, Ruixia, Fengzhen Huang, Weili Zhu, Ju He, Tingting Xu, Chen Yue, Jing Zhao, Xiaomei Lu et Jinsong Zhu. « Multiferroic and dielectric properties of Bi4LaTi3FeO15 ceramics ». Ceramics International 41 (juillet 2015) : S453—S457. http://dx.doi.org/10.1016/j.ceramint.2015.03.157.

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Klein, Andreas. « Interface Properties of Dielectric Oxides ». Journal of the American Ceramic Society 99, no 2 (14 janvier 2016) : 369–87. http://dx.doi.org/10.1111/jace.14074.

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Yanoh, T., A. Kurokawa, T. Miyasaka, K. Mori, M. Hachisu, H. Takeuchi, S. Yano et al. « Magnetic and Dielectric Properties of Multiferroic Bi1-xGdxFeO3 ». Journal of the Japan Society of Powder and Powder Metallurgy 61, S1 (2014) : S30—S33. http://dx.doi.org/10.2497/jjspm.61.s30.

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Kuroe, Haruhiko, Kento Aoki, Ryusuke Itoh, Tomohiro Hosaka, Takuya Hasegawa, Suguru Hachiuma, Mitsuru Akaki et al. « Thermal, dielectric, and magnetic properties in multiferroic Cu2.85Zn0.15Mo2O9 ». Journal of the Korean Physical Society 63, no 3 (août 2013) : 542–45. http://dx.doi.org/10.3938/jkps.63.542.

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Bakr Mohamed, Mohamed, Manuel Hinterstein et H. Fuess. « Dielectric anomaly and magnetic properties of multiferroic GaFe0.75Mn0.25O3 ». Materials Letters 85 (octobre 2012) : 102–5. http://dx.doi.org/10.1016/j.matlet.2012.07.007.

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Deng, Xiaohui, Wei Lu, Hai Wang, Haitao Huang et Jiyan Dai. « Electronic, magnetic and dielectric properties of multiferroic MnTiO3 ». Journal of Materials Research 27, no 11 (24 avril 2012) : 1421–29. http://dx.doi.org/10.1557/jmr.2012.101.

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Cho, Jae-Hyeon, et Wook Jo. « Progress in the Development of Single-Phase Magnetoelectric Multiferroic Oxides ». Ceramist 24, no 3 (30 septembre 2021) : 228–47. http://dx.doi.org/10.31613/ceramist.2021.24.3.03.

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Magnetoelectric (ME) multiferroics manifesting the coexistence and the coupling of ferromagnetic and ferroelectric order are appealing widespread interest owing to their fascinating physical behaviors and possible novel applications. In this review, we highlight the progress in single-phase ME multiferroic oxides research in terms of the classification depending on the physical origins of ferroic properties and the corresponding examples for each case, i.e., material by material, along with their ME multiferroic properties including saturation magnetization, spontaneous polarization, (anti)ferromagnetic/ferroelectric transition temperature, and ME coefficient. The magnetoelectrically-active applications of high expectancy are presented by citing the representative examples such as magnetoelectric random-access-memory and multiferroic photovoltaics. Furthermore, we discuss how the development of ME multiferroic oxides should proceed by considering the current research status in terms of developed materials and designed applications. We believe that this short review will provide a basic introduction for the researchers new to this field.
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Rather, Gowher Hameed, Mehraj ud Din Rather, Nazima Nazir, Afreen Ikram, Mohd Ikram et Basharat Want. « Particulate multiferroic Ba0.99Tb0.02Ti0.99O3 – CoFe1.8Mn0.2O4 composites : Improved dielectric, ferroelectric and magneto-dielectric properties ». Journal of Alloys and Compounds 887 (décembre 2021) : 161446. http://dx.doi.org/10.1016/j.jallcom.2021.161446.

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Niemiec, P., R. Skulski, D. Bochenek et P. Wawrzała. « Technology and Electrophysical Properties of Multiferroic PZT–PFT Ceramics ». Archives of Metallurgy and Materials 58, no 4 (1 décembre 2013) : 1361–64. http://dx.doi.org/10.2478/amm-2013-0175.

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Abstract We present the results of obtaining and investigating ceramic samples of solid solution (1-x)(PbZr0.53Ti0.47O3)- x(PbFe0.5Ta0.5O3) [i.e. (1-x)PZT-xPFT] with x =0.25, 0.35 and 0.45 obtained using conventional ceramic technology. These materials belong to class of materials known as multiferroics. Solid solutions PZT-PFT are the lowest-loss room-temperature multiferroics known, and as a result there are very interesting for magnetoelectric devices. Paper presents the results of termogravimetric investigations, EDS, XRD and main dielectric measurements. It has been stated that with increasing content of PFT decreases the mean diameter of grains and more wide distribution of grain diameters is observed. For x =0.25 sharp phase transition from ferroelectric phase to paraelectric one is observed and high values of dielectric permittivity. Composition PZT-PFT with x =0.45 has the lowest values of dielectric permittivity, and the transition is more diffused. The increase of x leads also to the shift of the temperature of maximum of dielectric permittivity towards lower temperatures. Samples with x =0.25 and x =0.35 exhibit very low values of dielectric losses up to about 100°C. Dielectric losses for samples with x =0.45 are higher. For obtained PZT-PFT samples we have investigated P-E hysteresis loops at room temperature for frequency 1 Hz. For composition x =0.25 it after application the field about 2.5 kV/mm polarization is equal approximately 28 μC/cm2, while for x =0.35, and x =0.45 after application the field about 2.0 kV/mm the polarizations are equal about 25 μC/cm2 and 20 μC/cm2 respectively. Very low values of losses and high values of polarization lead to the conclusion that interesting material PZT-PFT for applications should be composition with x =0.25.
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Xu, Wenfei, Zhi Wang, Jing Yang, Wei Bai, Yuanyuan Zhang et Xiaodong Tang. « Magnetic and Dielectric Properties in Multiferroic Y-type Hexaferrite ». Molecular Crystals and Liquid Crystals 603, no 1 (2 novembre 2014) : 235–39. http://dx.doi.org/10.1080/15421406.2014.967614.

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Kallaev, S. N., S. A. Sadykov, N. M. Alikhanov, Z. M. Omarov, R. G. Mitarov et L. A. Reznichenko. « Specific Heat and the Dielectric Properties of Bi0.8Ho0.2FeO3 Multiferroic ». Physics of the Solid State 62, no 6 (juin 2020) : 1039–42. http://dx.doi.org/10.1134/s1063783420060098.

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Pavlenko, A. V., K. M. Zhidel et L. A. Shilkina. « 0.5BiFeO3–0.5PbFe0.5Nb0.5O3 Multiferroic Ceramic : Structure, Dielectric and Magnetodielectric Properties ». Physics of the Solid State 62, no 10 (octobre 2020) : 1880–85. http://dx.doi.org/10.1134/s1063783420100248.

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Goian, V., S. Kamba, D. Nuzhnyy, P. Vaněk, M. Kempa, V. Bovtun, K. Knížek et al. « Dielectric, magnetic and structural properties of novel multiferroic Eu0.5Ba0.5TiO3ceramics ». Journal of Physics : Condensed Matter 23, no 2 (16 décembre 2010) : 025904. http://dx.doi.org/10.1088/0953-8984/23/2/025904.

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Banerjee, P., et A. Franco. « Enhanced dielectric and magnetic properties in multiferroic Bi0.99Y0.01Fe0.99Ni0.01O3 ceramic ». Materials Letters 184 (décembre 2016) : 17–20. http://dx.doi.org/10.1016/j.matlet.2016.08.009.

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Dai, Zhonghua, Yasuhisa Fujita et Yukikuni Akishige. « Dielectric properties and heating effect of multiferroic BiFeO3 suspension ». Materials Letters 65, no 13 (juillet 2011) : 2036–38. http://dx.doi.org/10.1016/j.matlet.2011.04.029.

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Grigalaitis, R., M. M. Vijatović Petrović, J. D. Bobić, A. Dzunuzovic, R. Sobiestianskas, A. Brilingas, B. D. Stojanović et J. Banys. « Dielectric and magnetic properties of BaTiO3 –NiFe2O4 multiferroic composites ». Ceramics International 40, no 4 (mai 2014) : 6165–70. http://dx.doi.org/10.1016/j.ceramint.2013.11.069.

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Wu, Y. J., Z. J. Hong, Y. Q. Lin, S. P. Gu, X. Q. Liu et X. M. Chen. « Room temperature multiferroic Ba4Bi2Fe2Nb8O30 : Structural, dielectric, and magnetic properties ». Journal of Applied Physics 108, no 1 (juillet 2010) : 014111. http://dx.doi.org/10.1063/1.3459887.

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Apostolova, I. N. « Dielectric and phonon properties of the multiferroic ferrimagnet Cu2OSeO3 ». Journal of Applied Physics 115, no 6 (14 février 2014) : 064103. http://dx.doi.org/10.1063/1.4865270.

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Kumar, Manish, S. Shankar, Om Parkash et O. P. Thakur. « Dielectric and multiferroic properties of 0.75BiFeO3–0.25BaTiO3 solid solution ». Journal of Materials Science : Materials in Electronics 25, no 2 (11 décembre 2013) : 888–96. http://dx.doi.org/10.1007/s10854-013-1661-9.

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Rajan, Soumya, P. M. Mohammed Gazzali, Lidia Okrasa et G. Chandrasekaran. « Multiferroic and magneto-dielectric properties in Fe doped BaTiO3 ». Journal of Materials Science : Materials in Electronics 29, no 13 (2 mai 2018) : 11215–28. http://dx.doi.org/10.1007/s10854-018-9208-8.

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Li, Zhengxin, Zhenhua Wang, Rongli Gao, Wei Cai, Gang Chen, Xiaoling Deng et Chunlin Fu. « Dielectric, ferroelectric and magnetic properties of Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 ceramics prepared at different sintering conditions ». Processing and Application of Ceramics 12, no 4 (2018) : 394–402. http://dx.doi.org/10.2298/pac1804394l.

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Although BiFeO3 (BFO) has attracted great attention due to its special physical properties as a typical single phase multiferroic material, the application is limited due to the formation of impurities, defects and so forth. Herein, we report improved multiferroic properties of Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 (BLSFTO) ceramics by combination of co-doping and sintering schedule. BLSFTO multiferroic ceramics were prepared by using the conventional solid state reaction method and the effect of sintering time (2, 5, 10, 20 and 30 h) on the structural, dielectric and multiferroic properties was investigated systematically. The result indicates that stable BLSFTO phase with perovskite structure was formed for all the samples. Only some impurities such as Bi2O4 can be observed when the sintering time is longer than 20 h, indicating that the sintering time can induce structural changes in BLSFTO and too long sintering time can remarkably increase the secondary phases. In addition, the frequency dependent dielectric properties show that sintering time has distinct effect on the frequency stability and the relaxation process. The result demonstrates that the enhanced magnetization, improved dielectric and ferroelectric properties may be correlated with the structural transformation, impurities, oxygen vacancies and grain morphology.
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ZHU, J. L., H. X. YANG, S. M. FENG, L. J. WANG, Q. Q. LIU, C. Q. JIN, X. H. WANG, L. T. LI et J. YU. « THE MULTIFERROIC PROPERTIES OF Bi(Fe1/2Cr1/2)O3 COMPOUND ». International Journal of Modern Physics B 27, no 15 (4 juin 2013) : 1362023. http://dx.doi.org/10.1142/s0217979213620233.

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Dense Bi ( Fe 1/2 Cr 1/2) O 3 ceramics with R3c crystal structure were synthesized by solid-state reaction under high pressure. Transmission electron microscope observations revealed an incommensurable superstructure along 〈110〉 direction. Magnetization measurements indicated a transition to a cooperative magnetic state below ~130 K. Dielectric properties of Bi ( Fe 1/2 Cr 1/2) O 3 showed a dielectric constant anomaly located at ~140 K indicating the giant dielectric relaxation in multiferroic Bi ( Fe 1/2 Cr 1/2) O 3 compound, which can be explained by the enhanced conductivity and possible Maxwell–Wagner contribution. Large dielectric frequency dispersion was observed at 140–185 K, and was supposed to be a thermal activated intrinsic process.
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Xu, Fang Long, Peng Jun Zhao, Jia Qi Zhang et Xin Qian Xiong. « Fluorine Doping Effects on the Electric Property of BiFeO3 Thin Films ». Applied Mechanics and Materials 624 (août 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.
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Shireen, Ajmala, Rana Saha, P. Mandal, A. Sundaresan et C. N. R. Rao. « Multiferroic and magnetodielectric properties of the Al1−xGaxFeO3family of oxides ». J. Mater. Chem. 21, no 1 (2011) : 57–59. http://dx.doi.org/10.1039/c0jm02688c.

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Xu, Xinye, Zheng Wu, Yanmin Jia, Weijian Li, Yongsheng Liu, Yihe Zhang et A’Xi Xue. « Multiferroic Properties of Nanopowder-Synthesized Ferroelectric-Ferromagnetic 0.6BaTiO3-0.4NiFe2O4Ceramic ». Journal of Nanomaterials 2015 (2015) : 1–5. http://dx.doi.org/10.1155/2015/613565.

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Multiferroic 0.6BaTiO3-0.4NiFe2O4dense nanoceramic composites were synthesized via a powder-in-sol precursor hybrid chemical synthesis route and a ceramic sintering process. At the measured frequency range (1 kHz~1 MHz), the relative dielectric constant is 150~1670 and the dielectric loss is 0.05~0.70. The composite ceramic showed obvious coexistence of ferroelectric and ferromagnetic phases. With the increase of temperature, the saturation ferromagnetic magnetization decreases, while the ferroelectric polarization increases.
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Ramachandran, T., Nhalil E. Rajeevan et P. P. Pradyumnan. « Thermoelectric Property in Multiferroics ». Advanced Materials Research 584 (octobre 2012) : 157–61. http://dx.doi.org/10.4028/www.scientific.net/amr.584.157.

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Thermoelectricity has gained special interest due to its potential applications, especially the advancements in the electronic devices with very low power consumption. Thermoelectric materials can be used to make energy conversion devices that generate power from thermal sources. Multiferroic oxides, in particular cobaltates, have been actively studied as a new type of thermoelectric material (1). The crystal structure of these cobaltates offers a possibility to manipulate Seebeck coefficient, electric conductivity, and thermal conductivity to optimize the figure of merit ZT. The theoretical explanation and experimental observations by some investigators proved the candidature of multiferroic materials for thermoelectric generation. Many semiconducting multiferroic oxides are showing spin dependent Seebeck coefficient (2-3). Moreover, most of these oxides are inherently stable at high temperatures in air, making them a suitable material for high temperature applications. In this work we have investigated the multiferroic and thermoelectric properties of thinfilms of doped cobalt oxide matrices. The observations confirmed that these materials are suitable for thermoelectric generation.
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ZHANG, X., G. Q. ZHANG, J. MIAO, X. G. XU et Y. JIANG. « ENHANCED MULTIFERROIC PROPERTIES OF BiFeO3 CERAMICS BY Mo DOPING ». Modern Physics Letters B 25, no 18 (20 juillet 2011) : 1521–28. http://dx.doi.org/10.1142/s0217984911026371.

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We have investigated the magnetic and electrical properties of multiferroic BiFe 1-x Mo x O 3 ceramics ( BFMO , x = 0.0%, 0.2%, 0.5% and 0.8%) prepared by the sol–gel method. The phase structure of BFMO samples were confirmed by X-ray diffraction. It was found that the substitution of Mo is responsible for the increasing of the magnetization in BFMO ceramics. Moreover, both dielectric and polarization-electric field properties suggest that the Mo doping could improve the dielectric and ferroelectric properties in BFMO ceramic.
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