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Статті в журналах з теми "Mn-Doped perovskites"

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Автор: Grafiati

Опубліковано: 24 червня 2023

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1

Bin Selim, Fahim, Alamgir Kabir, and Sadiq Shahriyar Nishat. "Effects of transition metal doping on CsGeBr₃ perovskite: First-principles study." AIP Advances 12, no. 7 (July 1, 2022): 075122. http://dx.doi.org/10.1063/5.0091354.

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Metal halide perovskites have shown the most promising results as the light-harvesting section of photovoltaics and opto-electronic devices. Among the non-toxic halide perovskites, CsGeBr3 was found to be the best candidate for opto-electronic applications; however, it is understood that the efficiency of CsGeBr3 can be further increased with the insertion of transition metals as dopants. In this article, the first-principles density functional theory calculations are used to predict the mechanical, structural, electronic, and optical properties of pristine, Ni-doped, Mn-doped, and Fe-doped CsGeBr3 with 12.5% of doping concentration. All the doped materials are found to be ferromagnetic and mechanically stable. They have finite magnetization values. The optical absorption edge in all the doped materials shows that they have additional peaks within the large emission range of solar radiation, which makes them more suitable than the pristine material for photovoltaics and opto-electronic applications. Among the doped materials, Mn-doped and Fe-doped CsGeBr3 have comparably higher absorption peaks and are almost identical in shape. The electronic bandgap is smaller than the pristine structure in the case of Fe-doped CsGeBr3 and larger for Ni and Mn-doped CsGeBr3. These combinational analyses lead to the decision that, among the non-toxic, inorganic perovskite materials, Fe-doped CsGeBr3 is better suited for the use in opto-electronic applications.

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2

Zhang, Yaheng, Chao Fan, Jianghong Tang, Gaoming Huang, Xinfa Qiang, Yu Fu, Wenjuan Zhou, Juan Wu, and Shouqiang Huang. "Systematic Microwave-Assisted Postsynthesis of Mn-Doped Cesium Lead Halide Perovskites with Improved Color-Tunable Luminescence and Stability." Nanomaterials 12, no. 15 (July 23, 2022): 2535. http://dx.doi.org/10.3390/nano12152535.

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The metal doping at the Pb2+ position provides improved luminescence performance for the cesium lead halide perovskites, and their fabrication methods assisted by microwave have attracted considerable attention due to the advantages of fast heating and low energy consumption. However, the postsynthetic doping strategy of the metal-doped perovskites driven by microwave heating still lacks systematic research. In this study, the assembly of CsPbBr3/CsPb2Br5 with a strong fluorescence peak at 523 nm is used as the CsPbBr3 precursor, and through the optimization of the postsynthetic conditions such as reaction temperatures, Mn2+/Pb2+ feeding ratios, and Mn2+ sources, the optimum Mn2+-doped product (CsPb(Cl/Br)3:Mn) is achieved. The exciton fluorescence peak of CsPb(Cl/Br)3:Mn is blueshifted to 437 nm, and an obvious fluorescence peak attributing to the doped Mn2+ ions at 597 nm is obtained. Both the CsPbBr3 precursor and CsPb(Cl/Br)3:Mn have high PLQY and stability because there are CsPb2Br5 microcubic crystals to well disperse and embed the CsPbBr3 nanocrystals (NCs) in the precursor, and after Mn2+-doping, this structure is maintained to form CsPb(Cl/Br)3:Mn NCs on the surface of their microcrystals. The exploration of preparation parameters in the microwave-assisted method provides insights into the enhanced color-tunable luminescence of the metal-doped perovskite materials.

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3

Witkiewicz-Lukaszek, Sandra, Anna Mrozik, Vitaliy Gorbenko, Tetiana Zorenko, Pawel Bilski, Yurii Syrotych, and Yuriy Zorenko. "Development of the Composite Thermoluminescent Detectors Based on the Single Crystalline Films and Crystals of Perovskite Compounds." Materials 15, no. 23 (November 28, 2022): 8481. http://dx.doi.org/10.3390/ma15238481.

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This work is dedicated to the development of new types of composite thermoluminescent detectors based on the single crystalline films of Ce-doped GdAlO3 perovskite and Mn-doped YAlO3 and (Lu0.8Y0.2)AlO3:Mn perovskites as well as Ce and Pr-doped YAlO3 single crystal substrates. These detectors were obtained using the Liquid Phase Epitaxy growth method from the melt solution based on the PbO-B2O3 fluxes. Such composite detectors can by applied for the simultaneous registration of different components of mixed ionization fluxes using the differences between the thermoluminescent glow curves, recorded from the film and crystal parts of epitaxial structures. For creation of the new composite detectors, we considered using, for the film and crystal components of epitaxial structures (i) the different perovskite matrixes doped with the same type of activator or (ii) the same perovskite host with various types of activators. The thermoluminescent properties of the different types of epitaxial structures based on the abovementioned films and crystal substrates were examined in the conditions of β-particles and X-ray excitation with aim of determination of the optimal combination of perovskites for composite detectors. It was shown that, among the structures with all the studied compositions, the best properties for the simultaneous thermoluminescent detection of α- and X-rays were the GdAlO3:Ce film/YAlO3:Ce crystal epitaxial structure.

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4

Aliaga, H., R. Allub, and B. Alascio. "Phase diagram of electron-doped Mn perovskites." Journal of Magnetism and Magnetic Materials 196-197 (May 1999): 522–24. http://dx.doi.org/10.1016/s0304-8853(98)00869-5.

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5

Zhang, Zhen, Zhaokuan Wen, Ting Li, Zhiguo Wang, Zhiyong Liu, Xiaxia Liao, Shanming Ke, and Longlong Shu. "Flexoelectric aging effect in ferroelectric materials." Journal of Applied Physics 133, no. 5 (February 7, 2023): 054102. http://dx.doi.org/10.1063/5.0134531.

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In spite of the flexoelectric effect being a universal phenomenon in the ferroelectric perovskites, the current understanding of flexoelectric aging in ferroelectrics is, actually, rather incomplete. In this paper, we have fabricated a series of Mn-doped BaTiO3 perovskite ceramics (BaTi1–xMnxO3, x = 0.1% and 1%, BTMO) to systematically investigate the corresponding flexoelectric aging behavior by controlling the concentration of Mn. We found that the variation of Mn dopant significantly effects the Curie temperature, dielectric constant, flexoelectric aging, and flexoelectric coefficient of the BTMO ceramics. Especially for the BTMO (0.1%) ceramics, obvious ferroelectric aging and flexoelectric aging phenomenon are observed at room temperature. The main reason for aging of BTMO ceramics is that the doping of Mn introduces oxygen vacancies, which tend to be stable under the action of strain gradient and electric field. Therefore, the results presented in this paper verify that the flexoelectric aging in Mn-doped BTO ceramics is closely related to ferroelectric fatigue.

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6

Zampieri, G., M. Abbate, F. Prado, and A. Caneiro. "Mn-2p XPS spectra of differently hole-doped Mn perovskites." Solid State Communications 123, no. 1-2 (July 2002): 81–85. http://dx.doi.org/10.1016/s0038-1098(02)00233-8.

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7

Demont, Antoine, and Stéphane Abanades. "High redox activity of Sr-substituted lanthanum manganite perovskites for two-step thermochemical dissociation of CO2." RSC Adv. 4, no. 97 (2014): 54885–91. http://dx.doi.org/10.1039/c4ra10578h.

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8

Demeter, M., M. Neumann, V. R. Galakhov, N. A. Ovechkina, E. Z. Kurmaev, and N. I. Labachevskaya. "Electronic Structure of Doped La-Mn-O Perovskites." Acta Physica Polonica A 98, no. 5 (November 2000): 587–91. http://dx.doi.org/10.12693/aphyspola.98.587.

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9

K., Nila Nandha, and Angshuman Nag. "Synthesis and luminescence of Mn-doped Cs2AgInCl6 double perovskites." Chemical Communications 54, no. 41 (2018): 5205–8. http://dx.doi.org/10.1039/c8cc01982g.

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10

Das Adhikari, Samrat, Anirban Dutta, Sumit Kumar Dutta, and Narayan Pradhan. "Layered Perovskites L2(Pb1–xMnx)Cl4 to Mn-Doped CsPbCl3 Perovskite Platelets." ACS Energy Letters 3, no. 6 (May 3, 2018): 1247–53. http://dx.doi.org/10.1021/acsenergylett.8b00653.

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11

ZHANG, NING. "SPIN-POLARIZATION DEPENDENT SMALL POLARON HOPPING IN MANGANESE PEROVSKITES." Modern Physics Letters B 17, no. 01 (January 10, 2003): 25–38. http://dx.doi.org/10.1142/s0217984903004816.

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Анотація:

A model of small polaron hopping being dependent on spin-polarization is suggested to describe the transport and the colossal magnetoresistance behaviors in manganese perovskites R-A-Mn-O (R: rear earth; A: alkali earth or transition metals). Being different from the theory of simple small polarons, the double exchange interaction and some empirical rules related to lattice effect induced by an external magnetic field and changing concentration have been taken into account. Based on this, a simple formula of resistivity versus temperature, concentration and normalized magnetization has been obtained for the hole-doped perovskite. From the formula, most of the transport behaviors including the colossal magnetoresistive observed in the perovskite have been successfully illustrated.

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12

Zeng, Min, Federico Locardi, Dimitrije Mara, Zeger Hens, Rik Van Deun, and Flavia Artizzu. "Switching on near-infrared light in lanthanide-doped CsPbCl3 perovskite nanocrystals." Nanoscale 13, no. 17 (2021): 8118–25. http://dx.doi.org/10.1039/d1nr00385b.

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13

Gálvez, M. E., R. Jacot, J. Scheffe, T. Cooper, G. Patzke, and A. Steinfeld. "Physico-chemical changes in Ca, Sr and Al-doped La–Mn–O perovskites upon thermochemical splitting of CO2via redox cycling." Physical Chemistry Chemical Physics 17, no. 9 (2015): 6629–34. http://dx.doi.org/10.1039/c4cp05898d.

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14

Wang, Shuaiqi, Duobin Wu, Shuming Yang, Hongyu Zhen, Zhenghuan Lin, and Qidan Ling. "Highly-efficient and stable warm white emission from perovskite/silica composites with photoactivated luminescence enhancement." Journal of Materials Chemistry C 8, no. 36 (2020): 12623–31. http://dx.doi.org/10.1039/d0tc03249b.

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Composite films based on Mn-doped perovskites emit strong and stable warm white light, and can be used as single-component luminescent material in UV-driven WLEDs. Additionally, the films exhibit interesting photoinduced-luminescence enhancement.

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15

Demazeau, Gérard, Alexey Baranov, Igor Presniakov, and Alexey Sobolev. "High Oxygen Pressures and the Stabilization of the Highest Oxidation States of Transition Metals – Mössbauer Spectroscopic Characterization of the Induced Electronic Phenomena." Zeitschrift für Naturforschung B 61, no. 12 (December 1, 2006): 1527–40. http://dx.doi.org/10.1515/znb-2006-1209.

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High oxygen pressures are a fruitful tool for the stabilization of the highest formal oxidation states of transition metals (Mn+) leading to the strongest chemical bonds; the improvement of the Mn+-O bond covalency induces different electronic phenomena. Among the physical characterizations applied to investigate such phenomena, 57Fe and 119Sn Mössbauer spectra are evaluated for studying unusual electronic configurations, orbital ordering, charge disproportionation and insulator-metal transitions in the perovskites series of 57Fe doped RENiO3 nickelates (RE = rare earths, Y and Tl) and 119Sn doped AEFeO3 ferrates (AE = Ca, Sr).

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16

Dąbrowa, Juliusz, Klaudia Zielińska, Anna Stępień, Marek Zajusz, Margarita Nowakowska, Maciej Moździerz, Katarzyna Berent, Maria Szymczak та Konrad Świerczek. "Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln1−xSrx(Co,Cr,Fe,Mn,Ni)O3−δ (Ln = La, Pr, Nd, Sm or Gd) Perovskites". Materials 14, № 18 (13 вересня 2021): 5264. http://dx.doi.org/10.3390/ma14185264.

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Phase composition, crystal structure, and selected physicochemical properties of the high entropy Ln(Co,Cr,Fe,Mn,Ni)O3−δ (Ln = La, Pr, Gd, Nd, Sm) perovskites, as well as the possibility of Sr doping in Ln1−xSrx(Co,Cr,Fe,Mn,Ni)O3−δ series, are reported is this work. With the use of the Pechini method, all undoped compositions are successfully synthesized. The samples exhibit distorted, orthorhombic or rhombohedral crystal structure, and a linear correlation is observed between the ionic radius of Ln and the value of the quasi-cubic perovskite lattice constant. The oxides show moderate thermal expansion, with a lack of visible contribution from the chemical expansion effect. Temperature-dependent values of the total electrical conductivity are reported, and the observed behavior appears distinctive from that of non-high entropy transition metal-based perovskites, beyond the expectations based on the rule-of-mixtures. In terms of formation of solid solutions in Sr-doped Ln1−xSrx(Co,Cr,Fe,Mn,Ni)O3−δ materials, the results indicate a strong influence of the Ln radius, and while for La-based series the Sr solubility limit is at the level of xmax = 0.3, for the smaller Pr it is equal to just 0.1. In the case of Nd-, Sm- and Gd-based materials, even for the xSr = 0.1, the formation of secondary phases is observed on the SEM + EDS images.

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17

Ren, Lixia, Yutao Wang, Min Wang, Shuanhu Wang, Yang Zhao, Claudio Cazorla, Changle Chen, Tom Wu, and Kexin Jin. "Tuning Magnetism and Photocurrent in Mn-Doped Organic–Inorganic Perovskites." Journal of Physical Chemistry Letters 11, no. 7 (March 12, 2020): 2577–84. http://dx.doi.org/10.1021/acs.jpclett.0c00034.

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18

Schrenk, Florian, Lorenz Lindenthal, Gernot Pacholik, Tina Navratil, Tobias Maximilian Berger, Hedda Drexler, Raffael Rameshan, Thomas Ruh, Karin Föttinger, and Christoph Rameshan. "Perovskite-Type Oxide Catalysts in CO2 Utilization: A Principal Study of Novel Cu-Doped Perovskites for Methanol Synthesis." Compounds 2, no. 4 (December 14, 2022): 378–87. http://dx.doi.org/10.3390/compounds2040031.

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Six different perovskite-type oxides were investigated with respect to their ability for methanol synthesis via H2 and CO2: Fe-, Mn-, and Ti-based perovskites were prepared with and without Cu doping. For assessment, the catalysts were subjected to preliminary tests at atmospheric pressure to evaluate their ability to activate CO2. Additional catalytic tests with the doped versions of each catalyst type were carried out in a pressured reactor at 21 bar. After the measurements, the catalysts were characterized with X-ray diffraction (XRD) and scanning electron microscopy (SEM). All catalysts were able to produce methanol in the pressure tests. CO2 conversions between 14% and 23% were reached at 400 °C, with the highest methanol selectivity at the lower temperature of 250 °C. The combination of XRD and SEM revealed that the Fe-based and Ti-based perovskites were stable under reaction conditions and that catalytically highly active and stable nanoparticles had formed. The minor formation of CaCO3, which is a deactivating phase, was observed for one catalyst. These nanoparticles showed resistance to coking and sintering. However, the yield and selectivity for methanol need to be improved via the further tailoring of the perovskite composition.

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19

Torregrosa-Rivero, Verónica, María-Salvadora Sánchez-Adsuar, and María-José Illán-Gómez. "Modified BaMnO3-Based Catalysts for Gasoline Particle Filters (GPF): A Preliminary Study." Catalysts 12, no. 11 (October 28, 2022): 1325. http://dx.doi.org/10.3390/catal12111325.

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Gasoline engines, mainly gasoline direct injection engines (GDI) require, in addition to three-way catalysts (TWC), a new catalytic system to remove the formed soot. Gasoline Particle Filters (GPF) are, among others, a possible solution. BaMnO3 and copper-doped BaMnO3 perovskites seem to be a feasible alternative to current catalysts for GPF. The physical and chemical properties of these two perovskites determining the catalytic performance have been modified using different synthesis routes: (i) sol-gel, (ii) modified sol-gel and iii) hydrothermal. The deep characterization allows concluding that: (i) all samples present a perovskite-like structure (hexagonal), except BMC3 which shows a polytype one (due to the distortion caused by copper insertion in the lattice), and ii) when a low calcination temperature is used during synthesis, the sintering effect decreases and the textural properties, the reducibility and the oxygen mobility are improved. The study of soot oxidation simulating the hardest GDI scenarios reveals that, as for diesel soot removal, the best catalytic performance involves the presence of oxygen vacancies to adsorb and activate oxygen and a labile Mn (IV)/Mn (III) redox pair to dissociate the adsorbed oxygen. The combination of both properties allows the transport of the dissociated oxygen towards the soot.

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20

Lightfoot, Philip. "Mode Analysis of the High Temperature Behaviour of some Ferroic Perovskites." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C506. http://dx.doi.org/10.1107/s2053273314094935.

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The advent of user-friendly on-line software (such as ISODISTORT [1] and AMPLIMODES [2]) to analyse crystal structures in terms of `distortion modes' rather than the conventional approach of refining individual atomic coordinates, has opened up new possibilities in the understanding of structure-property relationships in functional materials. The perovskite family is ideally suited to this approach, with many different variants on the basic cubic structure-type being brought about by simple symmetry-lowering modes such as tilting or distortion of almost rigid metal-ligand octahedral groups. In this talk I will illustrate the use of distortion mode analysis in understanding the sometimes complex, unusual and surprising structural behavior of several functional perovskites, particularly ferroelectrics and multiferroics. Examples chosen will exploit the use of powder neutron diffraction as the primary experimental technique, and will include sodium niobate, NaNbO3, which has the most complex high-temperature phase diagram of any simple perovskite, and derivatives of BiFeO3 (such as La or Mn-doped) which display unusual magnetostrictive behaviour.

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21

Tkach, Alexander, Abilio Almeida, Igor Levin, Joseph C. Woicik, and Paula M. Vilarinho. "Dielectric Relaxation, Local Structure and Lattice Dynamics in Mn-Doped Potassium Tantalate Ceramics." Materials 14, no. 16 (August 17, 2021): 4632. http://dx.doi.org/10.3390/ma14164632.

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Alkaline niobate and tantalate perovskites have attracted attention as polar dielectrics for electronics and telecommunications. Here, we studied the polar behaviour, lattice dynamics, and local structure in conventionally processed K0.985Mn0.015TaO3±δ ceramics using a combination of variable-temperature dielectric and Raman spectroscopies, and X-ray absorption fine structure (XAFS) measurements, respectively. Mn doping induces a low-frequency dielectric relaxation in KTaO3 (KT), which follows the Arrhenius law with an activation energy U ≈ 105 meV and the characteristic relaxation time τ0 ≈ 4.6 × 10−14 s. Our XAFS results support preferential Mn occupancy of the cuboctahedral sites as Mn2+, with these cations strongly off-centred in the oversized oxygen cages. Such disordered Mn displacements generate electric dipoles, which are proposed as the source of the observed dielectric relaxation. We show that in Mn-doped ceramics, the low-frequency polar TO1 mode softens on cooling and, at low temperatures, exhibits a higher frequency than in undoped KT. This mode displays no detectable splitting, which contrasts with Li-doped KT that also contains off-centred Li+ species on the cuboctahedral sites. Therefore, we conclude that the coupling between the Mn displacements and the lattice is weaker than in the Li case, and Mn-doped KT therefore exhibits a dielectric relaxation but no ferroelectric transition.

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22

Zhang, Liangdong, Tao Jiang, Chang Yi, Jiquan Wu, Xiao-Ke Liu, Yarong He, Yanfeng Miao, et al. "Bright Free Exciton Electroluminescence from Mn-Doped Two-Dimensional Layered Perovskites." Journal of Physical Chemistry Letters 10, no. 11 (May 23, 2019): 3171–75. http://dx.doi.org/10.1021/acs.jpclett.9b01326.

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23

Pandey, Nivedita, Abhishek Kumar, and Subhananda Chakrabarti. "Investigation of the structural, electronic, and optical properties of Mn-doped CsPbCl3: theory and experiment." RSC Advances 9, no. 51 (2019): 29556–65. http://dx.doi.org/10.1039/c9ra05685h.

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24

Khomchenko, V. A., I. O. Troyanchuk, D. V. Karpinsky, S. Das, V. S. Amaral, M. Tovar, V. Sikolenko, and J. A. Paixão. "Structural transitions and unusual magnetic behavior in Mn-doped Bi1−xLaxFeO3 perovskites." Journal of Applied Physics 112, no. 8 (October 15, 2012): 084102. http://dx.doi.org/10.1063/1.4759435.

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25

Cheng, Zhao-hua, Zhi-hong Wang, Nai-li Di, Rui-wei Li, R. A. Dunlap, and Bao-gen Shen. "Mössbauer Studies of Fe-doped La-Ca-Mn-O Colossal Magnetoresistive Perovskites." Microscopy and Microanalysis 8, S02 (August 2002): 396–97. http://dx.doi.org/10.1017/s1431927602100742.

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26

Liu, Yu-Wei, Shao-Hong Guo, Si-Qi You, Chun-Yi Sun, Xin-Long Wang, Liang Zhao, and Zhong-Min Su. "Mn-doped CsPb(Br/Cl)3 mixed-halide perovskites for CO2 photoreduction." Nanotechnology 31, no. 21 (March 12, 2020): 215605. http://dx.doi.org/10.1088/1361-6528/ab72be.

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27

Hou, Lu, Yihua Zhu, Jingrun Zhu, Xuyan Li, Feng Zeng, Tingyu Yang, Yiqin Gong, Jianhua Shen, and Chunzhong Li. "Synthesis of Gram‐Scale Ultrastable Mn‐Doped 2D Perovskites for Light‐Emitting Diodes." Advanced Materials Interfaces 8, no. 7 (February 22, 2021): 2002175. http://dx.doi.org/10.1002/admi.202002175.

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28

Salman, Ata ul Rauf, Signe Marit Hyrve, Samuel Konrad Regli, Muhammad Zubair, Bjørn Christian Enger, Rune Lødeng, David Waller, and Magnus Rønning. "Catalytic Oxidation of NO over LaCo1−xBxO3 (B = Mn, Ni) Perovskites for Nitric Acid Production." Catalysts 9, no. 5 (May 8, 2019): 429. http://dx.doi.org/10.3390/catal9050429.

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Анотація:

Nitric acid (HNO3) is an important building block in the chemical industry. Industrial production takes place via the Ostwald process, where oxidation of NO to NO2 is one of the three chemical steps. The reaction is carried out as a homogeneous gas phase reaction. Introducing a catalyst for this reaction can lead to significant process intensification. A series of LaCo1−xMnxO3 (x = 0, 0.25, 0.5 and 1) and LaCo1−yNiyO3 (y = 0, 0.25, 0.50, 0.75 and 1) were synthesized by a sol-gel method and characterized using N2 adsorption, ex situ XRD, in situ XRD, SEM and TPR. All samples had low surface areas; between 8 and 12 m2/g. The formation of perovskites was confirmed by XRD. The crystallite size decreased linearly with the degree of substitution of Mn/Ni for partially doped samples. NO oxidation activity was tested using a feed (10% NO and 6% O2) that partly simulated nitric acid plant conditions. Amongst the undoped perovskites, LaCoO3 had the highest activity; with a conversion level of 24.9% at 350 °C; followed by LaNiO3 and LaMnO3. Substitution of LaCoO3 with 25% mol % Ni or Mn was found to be the optimum degree of substitution leading to an enhanced NO oxidation activity. The results showed that perovskites are promising catalysts for NO oxidation at industrial conditions.

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29

Fokina, N. P. "[sup 55]Mn Spin Relaxation with the Participation of Mobile Carriers in Doped Perovskites." Physics of the Solid State 47, no. 3 (2005): 513. http://dx.doi.org/10.1134/1.1884714.

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30

Yang, Zhongqin, Ling Ye, and Xide Xie. "Theoretical Studies of Electronic and Magnetic Properties of Mn-Site-Doped Perovskites LaMn1-xNixO3." physica status solidi (b) 220, no. 2 (August 2000): 885–95. http://dx.doi.org/10.1002/(sici)1521-3951(200008)220:2<885::aid-pssb885>3.0.co;2-s.

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31

Siemons, Maike, and Ulrich Simon. "High Throughput Screening of the Sensing Properties of Doped SmFeO₃." Solid State Phenomena 128 (October 2007): 225–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.128.225.

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p-type semiconducting perovskites Sm1-xAxFe1-yByO3 (A=La, Sr, x=0, 10, 20 at%, B=Cr, Co, Mn, y=0, 10, 20 at%) were synthesised via the polyol method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to confirm the structure and morphology of the materials. Thick films of the materials prepared together with surface doped SmFeO3 (with Au, Ce, Ir, Pd, Pt, Rh, Ru) samples were electrically characterised using high throughput impedance spectroscopy (HT-IS). The gas sensing behaviour was tested at temperatures ranging from 200 to 500°C. For La and Cr doping a model describing a correlation between the (M-O) binding energy and the sensing properties was verified.

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Thakur, Samita, K. Singh, and O. P. Pandey. "Sr doped BiMO 3 (M = Mn, Fe, Y) perovskites: Structure correlated thermal and electrical properties." Materials Chemistry and Physics 187 (February 2017): 96–103. http://dx.doi.org/10.1016/j.matchemphys.2016.11.052.

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33

Sun, Chun, Zhiyuan Gao, Yuchen Deng, Hanxin Liu, Le Wang, Sijing Su, Peng Li, Huanrong Li, Zihui Zhang, and Wengang Bi. "Orange to Red, Emission-Tunable Mn-Doped Two-Dimensional Perovskites with High Luminescence and Stability." ACS Applied Materials & Interfaces 11, no. 37 (August 23, 2019): 34109–16. http://dx.doi.org/10.1021/acsami.9b11665.

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34

Repa, Gil M., and Lisa A. Fredin. "Mn environment in doped SrTiO₃ revealed by first-principles calculation of hyperfine splittings." Applied Physics Letters 121, no. 2 (July 11, 2022): 022401. http://dx.doi.org/10.1063/5.0096788.

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In order to take advantage of the strong correlation between geometric changes and electronic properties, better understanding of the structure and properties of perovskites doped with paramagnetic transition metal ions is required. Computational characterization of these dopants and calculated hyperfine values provide a guide that can ultimately aid in the interpretation of experimentally obtained electron paramagnetic resonance (EPR) spectra. In this study, we perform ab initio calculation of the hyperfine splitting parameter for Sr-substituted Mn2+ in SrTiO3 in various geometries in order to assign experimentally reported EPR peaks to exact dopant structures. Additionally, we calculate the hyperfine parameters for Mn4+ and Mn2+∕4+ with adjacent oxygen vacancy, which remain to be assigned peaks in experimental EPR spectra. Calculation of Ti-substituted Mn is largely hindered by the highly correlated electronic structure; however, it is shown that reasonable hyperfine values for Ti-site defects can be obtained by tuning functional parameters. Overall, this study demonstrates that calculating the hyperfine splitting for a transition metal dopant in a complex oxide is feasible and can provide a fingerprint for different geometries in equivalently defected systems.

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35

Cascos, V., L. Troncoso та J. A. Alonso. "New families of Mn+-doped SrCo1−xMxO3−δ perovskites performing as cathodes in solid-oxide fuel cells". International Journal of Hydrogen Energy 40, № 34 (вересень 2015): 11333–41. http://dx.doi.org/10.1016/j.ijhydene.2015.03.134.

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36

Olszewska, Anna, та Konrad Świerczek. "ReBaCo2-xMnxO5+δ (Re: rare earth element) layered perovskites for application as cathodes in Solid Oxide Fuel Cells". E3S Web of Conferences 108 (2019): 01020. http://dx.doi.org/10.1051/e3sconf/201910801020.

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Анотація:

Decrease of the operation temperature is considered as one of the most important targets in development of Solid Oxide Fuel Cells (SOFC), as it leads to considerable extension of their long-term operation and makes construction and utilization of the SOFC generators cost-effective. Relatively high value of the activation energy of the oxygen reduction reaction (ORR) occurring at the cathode, and consequently, large cathodic polarization resistance at lower temperatures is a major obstacle hindering usage of SOFCs at decreased temperatures. In this work possibility of application of manganese-doped cobalt-based cation-ordered perovskites as candidate cathode materials in the intermediate temperature (IT, ca. 600-800 °C) range is discussed. The considered oxide materials, depending on chemical composition, i.e. choice of Re element and Mn-doping level exhibit high values of mixed ionic-electronic conductivity, as well as good catalytic activity toward the oxygen reduction and moderate thermal expansion. Cathode layers manufactured on a basis of selected ReBaCo2-xMnxO5+δ oxides show low polarisation resistance.

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37

Lee, Sang Eun, Jun Seo Park, and Hee Jung Park. "Electrochemical Performance of the Ni-Fe Based Metal-Support Solid Oxide Fuel Cell with Ba-Sr-Co-Fe-O and La-Sr-Mn-O Cathodes." Korean Journal of Metals and Materials 60, no. 7 (July 5, 2022): 523–30. http://dx.doi.org/10.3365/kjmm.2022.60.7.523.

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Unlike conventional solid oxide fuel cells (SOFCs) where ceramic materials have been used as a support, in this study a new SOFC structure with a metal support and a contact layer between the support and anode is suggested. A mixture of Ni-Fe alloy and zirconia ceramics as the contact layer were employed to enhance the compatibility of the metal support and the anode (Ni-zirconia). Common materials, including acceptor-doped zirconia and perovskites (Ba-Sr-Co-Fo-O, La-Sr-Mn-O), were used for the solid electrolyte and cathode of the SOFC. The electrode polarization resistance of the metal-supported SOFC manufactured in this way depended on the resistance between the cathode and electrolyte. For the SOFC with a Ba-Sr-Co-Fe-O cathode, not only large polarization resistance but also large ohmic resistance occurred due to the formation of an insulator phase on the surface of the solid electrolyte. Consequently, it exhibited low fuel cell performance (power density ~ 40 mW/cm2 at 750oC). On the other hand, a high fuel cell performance of ~ 290 mW/cm2 was achieved for the SOFC with the La-Sr-Mn-O cathode. The ohmic resistance was affected by the metal support and the contact layer.

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38

Hou, Lu, Yihua Zhu, Jingrun Zhu, Yiqin Gong, and Chunzhong Li. "Mn-doped 2D Sn-based perovskites with energy transfer from self-trapped excitons to dopants for warm white light-emitting diodes." Journal of Materials Chemistry C 8, no. 25 (2020): 8502–6. http://dx.doi.org/10.1039/d0tc00959h.

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39

Ke, Bao, Ruosheng Zeng, Zhuang Zhao, Qilin Wei, Xiaogang Xue, Kun Bai, Chunxiao Cai, Weichang Zhou, Zhiguo Xia, and Bingsuo Zou. "Homo- and Heterovalent Doping-Mediated Self-Trapped Exciton Emission and Energy Transfer in Mn-Doped Cs2Na1–xAgxBiCl6 Double Perovskites." Journal of Physical Chemistry Letters 11, no. 1 (December 18, 2019): 340–48. http://dx.doi.org/10.1021/acs.jpclett.9b03387.

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40

Onrubia-Calvo, Jon A., B. Pereda-Ayo, U. De-La-Torre, and Juan R. González-Velasco. "Key factors in Sr-doped LaBO3 (B = Co or Mn) perovskites for NO oxidation in efficient diesel exhaust purification." Applied Catalysis B: Environmental 213 (September 2017): 198–210. http://dx.doi.org/10.1016/j.apcatb.2017.04.068.

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41

Usman, Muhammed Haris Palattuparambil, Rangarajan Bakthavatsalam, and Janardan Kundu. "Colloidal Mn 2+ Doped 2D ( n =1) Lead Bromide Perovskites: Efficient Energy Transfer and Role of Anion in Doping Mechanism." ChemistrySelect 3, no. 23 (June 20, 2018): 6585–95. http://dx.doi.org/10.1002/slct.201801248.

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42

Sahadevan, Jhelai, P. Sivaprakash, S. Esakki Muthu, Ikhyun Kim, N. Padmanathan, and V. Eswaramoorthi. "Influence of Te-Incorporated LaCoO3 on Structural, Morphology and Magnetic Properties for Multifunctional Device Applications." International Journal of Molecular Sciences 24, no. 12 (June 14, 2023): 10107. http://dx.doi.org/10.3390/ijms241210107.

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A high perovskite activity is sought for use in magnetic applications. In this paper, we present the simple synthesis of (2.5% and 5%) Tellurium-impregnated-LaCoO3 (Te-LCO), Te and LaCoO3 (LCO) by using a ball mill, chemical reduction, and hydrothermal synthesis, respectively. We also explored the structure stability along with the magnetic properties of Te-LCO. Te has a rhombohedral crystal structure, whereas Te-LCO has a hexagonal crystal system. The reconstructed Te was imbued with LCO that was produced by hydrothermal synthesis; as the concentration of the imbuing agent grew, the material became magnetically preferred. According to the X-ray photoelectron spectra, the oxidation state of the cobaltite is one that is magnetically advantageous. As a result of the fact that the creation of oxygen-deficient perovskites has been shown to influence the mixed (Te4+/2−) valence state of the incorporated samples, it is abundantly obvious that this process is of utmost significance. The TEM image confirms the inclusion of Te in LCO. The samples start out in a paramagnetic state (LCO), but when Te is added to the mixture, the magnetic state shifts to a weak ferromagnetic one. It is at this point that hysteresis occurs due to the presence of Te. Despite being doped with Mn in our prior study, rhombohedral LCO retains its paramagnetic characteristic at room temperature (RT). As a result, the purpose of this study was to determine the impacts of RT field dependency of magnetization (M-H) for Te-impregnated LCO in order to improve the magnetic properties of RT because it is a low-cost material for advanced multi-functional and energy applications.

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43

Zhang, Long, Zhengtao Liu, Xuening Sun, Guangming Niu, Jutao Jiang, Yuanyuan Fang, Defang Duan, et al. "Retainable Bandgap Narrowing and Enhanced Photoluminescence in Mn‐Doped and Undoped Cs ₂ NaBiCl ₆ Double Perovskites by Pressure Engineering." Advanced Optical Materials 10, no. 2 (November 21, 2021): 2101892. http://dx.doi.org/10.1002/adom.202101892.

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44

Makino, Narimichi, Bong Yeon Lee, Makoto Moriya, Wataru Sakamoto, Takashi Iijima, and Toshinobu Yogo. "Synthesis and Properties of Mn-Doped (Bi_0.5Na_0.5)TiO₃ Thin Films by Chemical Solution Deposition." Key Engineering Materials 582 (September 2013): 59–62. http://dx.doi.org/10.4028/www.scientific.net/kem.582.59.

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Lead-free ferroelectric (Bi0.5Na0.5)TiO3(BNT) thin films were prepared by chemical solution deposition. BNT and Mn-doped BNT precursor thin films crystallized in the perovskite single phase at 700 °C on Pt/TiOx/SiO2/Si substrates. The leakage current density of the perovskite BNT films, especially in the high applied field region, was reduced by doping with a small amount of Mn. Also, Mn doping markedly improved the ferroelectric properties of the films. 0.5 and 1.0 mol% Mn-doped BNT thin films exhibited well-shaped ferroelectric polarization (P) electric field (E) hysteresis loops at room temperature. Furthermore, the 1 mol% Mn-doped BNT films showed a typical field-induced strain loop, and the effectived33values were estimated to be about 60 pm/V.

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45

Hang, Qi Ming, Feng Shan, Jian Min Zhu, and Xin Hua Zhu. "Synthesis, Microstructure, and Dielectric Properties of Mn-Doped 0.33BaTiO₃-0.67BiFeO₃ Multiferroic Solid Solutions." Materials Science Forum 745-746 (February 2013): 107–12. http://dx.doi.org/10.4028/www.scientific.net/msf.745-746.107.

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In this work, 0.33BaTiO3-0.67BiFeO3 multiferroic ceramics doped with x mol% MnO2 (x= 0.1-1.0) were fabricated by solid-state reaction method, and their microstructure and dielectric property were also investigated. The perovskite phase structure of the solid solutions was confirmed by X-ray diffraction patterns, and the formation of minor impure phase of Bi2Fe4O9 was prevent effectively by Mn-doping. With increasing the Mn-doped concentration, the dielectric constants of Mn-doped 0.33BaTiO3-0.67BiFeO3 multiferroic ceramics first increased, and reached a maximum value of 340 (measured @1MHz) at the Mn-doped concentration of 0.60 mol%, and then decreased. On the other hand, the dielectric losses first decreased, and reached the minimum value at the Mn-doped concentration of 0.30 mol%, and then increased along with increasing the Mn-doped concentrations. The ferroelectric domain structures in the Mn-doped 0.33BaTiO3 - 0.67BiFeO3 multiferroic ceramics with rhombohedral symmetry were also revealed by TEM image and selected area electron diffraction patterns, and tweed-like domain structures were observed.

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46

Hwang, Ji Yong, Chung Wung Bark, and Hyung Wook Choi. "Application of ZnGa2O4:Mn Down-Conversion Layer to Increase the Energy-Conversion Efficiency of Perovskite Solar Cells." Journal of Nanoscience and Nanotechnology 21, no. 8 (August 1, 2021): 4362–66. http://dx.doi.org/10.1166/jnn.2021.19407.

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The perovskite solar cell is capable of energy conversion in a wide range of wavelengths, from 300 nm to 800 nm, which includes the entire visible region and portions of the ultraviolet and infrared regions. To increase light transmittance of perovskite solar cells and reduce manufacturing cost of perovskite solar cells, soda-lime glass and transparent conducting oxides, such as indium tin oxide and fluorine-doped tin oxide are mainly used as substrates and light-transmitting electrodes, respectively. However, it is evident from the transmittance of soda-lime glass and transparent conductive oxides measured via UV-Vis spectrometry that they absorb all light near and below 310 nm. In this study, a transparent Mn-doped ZnGa2O4 film was fabricated on the incident surface of perovskite solar cells to obtain additional light energy by down-converting 300 nm UV light to 510 nm visible light. We confirmed the improvement of power efficiency by applying a ZnGa2O4:Mn down-conversion layer to perovskite solar cells.

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47

Shuai, Yao, Sheng Qiang Zhou, and Heidemarie Schmidt. "Electrical and Magnetic Properties of Polycrystalline Mn-Doped BaTiO₃ Thin Films Grown on Pt/Sapphire Substrates by Pulsed Laser Deposition." Advances in Science and Technology 67 (October 2010): 212–17. http://dx.doi.org/10.4028/www.scientific.net/ast.67.212.

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5 at.% Mn-doped and undoped, 200 nm thick BaTiO3 thin films have been grown under different oxygen partial pressures by pulsed laser deposition on Pt/sapphire substrates. X-ray diffraction (XRD) measurements reveal the same polycrystalline single-phase perovskite structure for all the thin films despite the different oxygen partial pressure, while their preferred orientation strongly depends on the oxygen partial pressure. The 5 at. % Mn-doping decreases the dielectric loss of the Mn-doped BaTiO3 thin films, however, their relative permittivity is also decreased. Ferroelectricity has been probed on the Mn-doped and undoped BaTiO3 thin films grown under relatively high oxygen partial pressure. A ferromagnetic coupling of the Mn dopant ions has been probed at room tempetature on the Mn-doped BaTiO3 thin films prepared under low oxygen partial pressure and is understood in terms of the bound magnetic polaron model.

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48

Xing, Gongcheng, Yuxin Feng, Min Pan, Yi Wei, Guogang Li, Peipei Dang, Sisi Liang, Maxim S. Molokeev, Ziyong Cheng, and Jun Lin. "Photoluminescence tuning in a novel Bi3+/Mn4+ co-doped La2ATiO6:(A = Mg, Zn) double perovskite structure: phase transition and energy transfer." Journal of Materials Chemistry C 6, no. 48 (2018): 13136–47. http://dx.doi.org/10.1039/c8tc05171b.

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Enhanced red emission of Mn⁴⁺ and photoluminescence tuning by Bi³⁺ → Mn⁴⁺ energy transfer and symmetric changes in Bi³⁺/Mn⁴⁺-doped La₂ATiO₆ (A = Mg, Zn) double perovskite structure phosphors.

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49

Ming, Hong, Lili Liu, Shengan He, Jiaqing Peng, Fu Du, Junxiang Fu, Fengli Yang, and Xinyu Ye. "An ultra-high yield of spherical K2NaScF6:Mn4+ red phosphor and its application in ultra-wide color gamut liquid crystal displays." Journal of Materials Chemistry C 7, no. 24 (2019): 7237–48. http://dx.doi.org/10.1039/c9tc02295c.

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A novel Mn⁴⁺-doped double-perovskite red phosphor K₂NaScF₆:Mn⁴⁺ with ultra-high synthetic yield and uniform spherical morphology was developed for ultra-wide color gamut LCDs.

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50

Wang, Peng, Jiashan Mao, Lu Zhao, Bin Jiang, Chunyan Xie, Yan Lin, Fengfeng Chi, Min Yin, and Yonghu Chen. "Double perovskite A2LaNbO6:Mn4+,Eu3+ (A = Ba, Ca) phosphors: potential applications in optical temperature sensing." Dalton Transactions 48, no. 27 (2019): 10062–69. http://dx.doi.org/10.1039/c9dt01524h.

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