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Journal articles on the topic 'Magnetic Perovskite Oxides'

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1

Matsumoto, Yasumichi. "Electrochemical and Photoelectrochemical Processing for Oxide Films." MRS Bulletin 25, no. 9 (2000): 47–50. http://dx.doi.org/10.1557/mrs2000.179.

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Metal oxides are important materials in industry. For example, there are many kinds of functional oxides: dielectric oxides such as BaTiO3 (perovskite), semiconductor oxides such as ZnO, ionic conductors such as Bi2O3, magnetic oxides such as Fe3−xMxO4 (spinel), and so on. These oxide materials must be prepared as films, nanodots, and layered films to increase their functionality for a wide variety of applications.
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2

Bhavyasree, A. B., K. P. Latha, and H. S. Jayanna. "Photocatalytic activity of Perovskites for degradation of dyes." Research Journal of Chemistry and Environment 25, no. 9 (2021): 146–50. http://dx.doi.org/10.25303/259rjce146150.

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Perovskites are mixed metal-oxides which have received much attention and more applicative interests in the research field as well as in industry due to their unique properties like high surface area, small size, excellent magnetic property, thermal stability and low price. Perovskites are effectively used as semiconductors, adsorbents, catalyst, Superconductors etc. The present study outlined the broad overview of the Perovskite as photocatalyst.
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3

Barrera, A., M. L. Chávez, E. Chavira, T. A. García, and J. M. E. Carreto. "Perovskite gels combustion synthesis from rare earth aluminates. Development of multifuncional properties." MRS Advances 5, no. 62 (2020): 3301–13. http://dx.doi.org/10.1557/adv.2020.444.

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AbstractThe purpose of this work was the synthesis of the perovskites with rare earth, by gel combustion method with pigmenting, magnetic and luminescent properties. The synthesis of perovskite structure is important for material development, with multi features. In this work, the synthesis was from metal oxides by the method of combustion of gels at 500 °C, for 10 s. Color of perovskites obtained, with nanometric particle size (31-44 nm) was analysed by CIEL*a*b* with tonalities ranged from white to pink except for Pr-perovskites with yellow and brown. Its paramagnetic properties were verifie
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4

Toan, N. N., S. Saukko, V. Lantto, Do Thi Anh Thu, and Nguyen Sy Hieu. "Gas Sensing with Nanocrystalline Magnetic Perovskite Oxides." Physica Scripta T114 (January 1, 2004): 167–70. http://dx.doi.org/10.1088/0031-8949/2004/t114/042.

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5

Shimakawa, Yuichi. "Multiple magnetic interactions in ordered perovskite-structure oxides." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C981. http://dx.doi.org/10.1107/s2053273314090184.

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Cation ordering in transition-metal oxides often drastically modifies their properties. We focus on A-and-B-site-ordered quadruple perovskite-structure oxides AA'3B2B'2O12, in which transition-metal ions are included at the A', B, and B' sites in an ordered manner. In such compounds A'-A', A'-B, A'-B', and B-B' interactions compete with each other and play important role in giving rise to unusual properties. The A-and-B-site-ordered quadruple perovskite CaCu3Fe2Sb2O12with magnetic Fe3+at the B site and nonmagnetic Sb5+at the B' site was successfully synthesized under a high-pressure and high-t
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6

Abdel Maksoud, M. I. A., Ramy Amer Fahim, Ahmed G. Bedir, et al. "Engineered magnetic oxides nanoparticles as efficient sorbents for wastewater remediation: a review." Environmental Chemistry Letters 20, no. 1 (2021): 519–62. http://dx.doi.org/10.1007/s10311-021-01351-3.

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AbstractThe rapid urbanization and industrialization is causing worldwide water pollution, calling for advanced cleaning methods. For instance, pollutant adsorption on magnetic oxides is efficient and very practical due to the easy separation from solutions by an magnetic field. Here we review the synthesis and performance of magnetic oxides such as iron oxides, spinel ferrites, and perovskite oxides for water remediation. We present structural, optical, and magnetic properties. Magnetic oxides are also promising photocatalysts for the degradation of organic pollutants. Antimicrobial activitie
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7

Yan, Aiyu, Bin Liu, Baofeng Tu, et al. "A Temperature-Programmed-Reduction Study on La1−xSrxCrO3 and Surface-Ruthenium-Modified La1−xSrxCrO3." Journal of Fuel Cell Science and Technology 4, no. 1 (2006): 79–83. http://dx.doi.org/10.1115/1.2393308.

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A series of La1−xSrxCrO3(0⩽x⩽0.3) composite oxides were prepared by a modified citric method. These perovskite oxides were further modified with Ru through impregnation. X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and temperature-programmed-reduction (TPR) techniques were adopted to investigate the properties of both the as-prepared perovskite oxides and the surface-Ru-modified La1−xSrxCrO3 samples. XPS results indicated the existence of Cr6+ ions in the fresh samples and transformed to Cr3+ after reduction. The hydrogen consumed by these perovskite oxides during TPR increased wi
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8

Ohtomo, Akira, Suvankar Chakraverty, Hisanori Mashiko, Takayoshi Oshima, and Masashi Kawasaki. "Spontaneous atomic ordering and magnetism in epitaxially stabilized double-perovskites." MRS Proceedings 1454 (2012): 3–13. http://dx.doi.org/10.1557/opl.2012.923.

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ABSTRACTWe report on the atomic ordering of B-site transition-metals and magnetic properties in double-perovskite oxides, La2CrFeO6 (LCFO) and La2VMnO6 (LVMO), which have never been reported to exist in ordered forms. These double-perovskite oxides are particularly interesting because of possible ferromagnetism (expected from the Kanamori-Goodenough rule for LCFO) and half-metallic antiferromagnetism (predicted for LVMO). Using pulsed-laser deposition technique with single solid-solution targets, we have prepared epitaxial films in ordered forms. Despite similar ionic characters of constituent
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9

Yoo, Young K., and Frank Tsui. "Continuous Phase Diagramming of Epitaxial Films." MRS Bulletin 27, no. 4 (2002): 316–23. http://dx.doi.org/10.1557/mrs2002.99.

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AbstractHigh-throughput and systematic studies of complex materials systems using the approach of “continuous phase diagramming” (CPD) are described in this article. The discussions focus on the techniques of epitaxial film synthesis of CPD and mapping physical and structural properties, using two different material systems as examples: doped perovskite manganese oxides and magnetic alloys. In doped perovskite manganese oxides, a highly correlated system, mapping the optical, electrical, and magnetic properties, reveals surprising evidence of electronic phase transitions that correlate with th
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10

Náfrádi, Bálint, Péter Szirmai, Massimo Spina, et al. "Tuning ferromagnetism at room temperature by visible light." Proceedings of the National Academy of Sciences 117, no. 12 (2020): 6417–23. http://dx.doi.org/10.1073/pnas.1915370117.

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Most digital information today is encoded in the magnetization of ferromagnetic domains. The demand for ever-increasing storage space fuels continuous research for energy-efficient manipulation of magnetism at smaller and smaller length scales. Writing a bit is usually achieved by rotating the magnetization of domains of the magnetic medium, which relies on effective magnetic fields. An alternative approach is to change the magnetic state directly by acting on the interaction between magnetic moments. Correlated oxides are ideal materials for this because the effects of a small external contro
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11

Porta, Piero, Sergio De Rossi, Marco Faticanti, et al. "Perovskite-Type Oxides." Journal of Solid State Chemistry 146, no. 2 (1999): 291–304. http://dx.doi.org/10.1006/jssc.1999.8326.

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12

Lisi, Luciana, Giovanni Bagnasco, Paolo Ciambelli, et al. "Perovskite-Type Oxides." Journal of Solid State Chemistry 146, no. 1 (1999): 176–83. http://dx.doi.org/10.1006/jssc.1999.8327.

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13

Li, Xiaoning, Xiaofeng Yin, Wen Gu, et al. "Sonocatalysis of the magnetic recyclable layered perovskite oxides." Ultrasonics Sonochemistry 49 (December 2018): 260–67. http://dx.doi.org/10.1016/j.ultsonch.2018.08.008.

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14

Liu, Y., J. Dong, and D. Y. Xing. "Magnetic phase diagram of perovskite Mn oxides at." European Physical Journal B 3, no. 2 (1998): 185–88. http://dx.doi.org/10.1007/s100510050301.

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15

Mazza, Alessandro R., Elizabeth Skoropata, Jason Lapano, et al. "Hole doping in compositionally complex correlated oxide enables tunable exchange biasing." APL Materials 11, no. 3 (2023): 031118. http://dx.doi.org/10.1063/5.0142224.

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Magnetic interfaces and the phenomena arising from them drive both the design of modern spintronics and fundamental research. Recently, it was revealed that through designing magnetic frustration in configurationally complex entropy stabilized oxides, exchange bias can occur in structurally single crystal films. This eliminates the need for complex heterostructures and nanocomposites in the design and control of magnetic response phenomena. In this work, we demonstrate through hole doping of a high entropy perovskite oxide that tuning of magnetic responses can be achieved. With detailed magnet
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16

Denis Romero, Fabio, and Yuichi Shimakawa. "Charge transitions in perovskite oxides containing unusually high-valent Fe." Chemical Communications 55, no. 26 (2019): 3690–96. http://dx.doi.org/10.1039/c8cc10207d.

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17

Itoh, Mitsuru, and Hiroki Taniguchi. "Ferroelectricity in Perovskite-Type Oxides." Ferroelectrics 369, no. 1 (2008): 127–32. http://dx.doi.org/10.1080/00150190802377918.

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18

Younsi, Ahmed Memdouh, Lakhdar Gacem, and Mohamed Toufik Soltani. "Lattice Parameters, Electronic, and Magnetic Properties of Cubic Perovskite Oxides ARuO3 (A=Sr, Rb): A First‑Principles Study." Revue des composites et des matériaux avancés 31, no. 6 (2021): 335–40. http://dx.doi.org/10.18280/rcma.310604.

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Trioxides of rubidium, strontium, and ruthenium belong to the family of alkali and alkaline earth ruthenates. SrRuO3 crystallizes in various symmetry classes—orthorhombic, tetragonal, or cubic—whereas RbRuO3 is perovskite (cubic) structured and crystallizes only in the cubic space group Pm3¯¯¯m(No. 221). In this study, we investigated the structural stability as well as the electronic and magnetic properties of two cubic perovskites SrRuO3 and RbRuO3. We established the corresponding lattice parameters, magnetic moments, density of states (DOS), and band structures using ab‑initio density‑func
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19

Shaikh, Monirul, Aafreen Fathima, M. J. Swamynadhan, Hena Das, and Saurabh Ghosh. "Investigation into Cation-Ordered Magnetic Polar Double Perovskite Oxides." Chemistry of Materials 33, no. 5 (2021): 1594–606. http://dx.doi.org/10.1021/acs.chemmater.0c02976.

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20

Mochizuki, Masahito, and Masatoshi Imada. "Magnetic Phase Transition of the Perovskite-Type Ti Oxides." Journal of the Physical Society of Japan 69, no. 7 (2000): 1982–85. http://dx.doi.org/10.1143/jpsj.69.1982.

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21

Guo, Z. B., Y. W. Du, J. S. Zhu, H. Huang, W. P. Ding, and D. Feng. "Large Magnetic Entropy Change in Perovskite-Type Manganese Oxides." Physical Review Letters 78, no. 6 (1997): 1142–45. http://dx.doi.org/10.1103/physrevlett.78.1142.

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22

Sekizawa, K., M. Kitagawa, and Y. Takano. "Magnetic properties of Pr ions in perovskite-type oxides." Journal of Magnetism and Magnetic Materials 177-181 (January 1998): 541–42. http://dx.doi.org/10.1016/s0304-8853(97)00947-5.

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23

KUZUSHITA, K. "Charge disproportionation and magnetic properties in perovskite iron oxides." Physica B: Condensed Matter 329-333 (May 2003): 736–37. http://dx.doi.org/10.1016/s0921-4526(02)02478-x.

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24

Jiang, Jie, Jinming Dong, and D. Y. Xing. "Magnetic transition in perovskite Mn oxides at T=0." Physical Review B 55, no. 14 (1997): 8973–81. http://dx.doi.org/10.1103/physrevb.55.8973.

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25

Tokuda, Makoto, Khandaker Jahirul Isram, Yudai Ogata, et al. "Strong-Gravity Experiments on Perovskite-Type Oxides." Advances in Science and Technology 88 (October 2014): 70–73. http://dx.doi.org/10.4028/www.scientific.net/ast.88.70.

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Strong gravitational field causes the displacement or/and sedimentation of atoms in solids, by which we can changes the crystalline state or/and composition in multicomponent condensed matter. Perovskite-type doped manganite, La1-xSrxMnO3(LSMO) has unique magnetoresistance effect which is called “colossal magnetoresistance (CMR)”. In this study, the strong gravity experiment (0.40x106G, 400°C, 20h) was performed on the LSMO oriented crystal to examine the change in composition or structure. The LSMO crystal whose growing crystal direction is normal to (214) plane was prepared by the floating z
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26

Hasanli, Nijat, Alex Scrimshire, Paul A. Bingham, Robert G. Palgrave, and Michael A. Hayward. "Structure and magnetism of the Rh4+-containing perovskite oxides La0.5Sr0.5Mn0.5Rh0.5O3 and La0.5Sr0.5Fe0.5Rh0.5O3." Dalton Transactions 49, no. 32 (2020): 11346–53. http://dx.doi.org/10.1039/d0dt02466j.

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27

Tiittanen, Taneli, Sami Vasala, and Maarit Karppinen. "Assessment of magnetic properties of A2B′B′′O6 double perovskites by multivariate data analysis techniques." Chemical Communications 55, no. 12 (2019): 1722–25. http://dx.doi.org/10.1039/c8cc09579e.

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28

Abhyankar, Nandita, Amit Agrawal, Pragya Shrestha, et al. "Scalable microresonators for room-temperature detection of electron spin resonance from dilute, sub-nanoliter volume solids." Science Advances 6, no. 44 (2020): eabb0620. http://dx.doi.org/10.1126/sciadv.abb0620.

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We report a microresonator platform that allows room temperature detection of electron spins in volumes on the order of 100 pl, and demonstrate its utility to study low levels of dopants in perovskite oxides. We exploit the toroidal moment in a planar anapole, using a single unit of an anapole metamaterial architecture to produce a microwave resonance exhibiting a spatially confined magnetic field hotspot and simultaneously high quality-factor (Q-factor). To demonstrate the broad implementability of this design and its scalability to higher frequencies, we deploy the microresonators in a comme
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29

Rao, C. N. R. "Perovskite oxides and high-temperature superconductivity." Ferroelectrics 102, no. 1 (1990): 297–308. http://dx.doi.org/10.1080/00150199008221489.

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30

Bobrysheva, N. P., and A. A. Selyutin. "Magnetic properties of iron atoms in the perovskite-like oxides." Russian Journal of General Chemistry 79, no. 4 (2009): 695–96. http://dx.doi.org/10.1134/s1070363209040021.

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31

Tokura, Y., Y. Tomioka, H. Kuwahara, A. Asamitsu, Y. Moritomo, and M. Kasai. "Magnetic-field-induced insulator-metal phenomena in perovskite manganese oxides." Physica C: Superconductivity 263, no. 1-4 (1996): 544–49. http://dx.doi.org/10.1016/0921-4534(96)00076-7.

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32

Shimakawa, Yuichi, and Masaichiro Mizumaki. "Multiple magnetic interactions in A-site-ordered perovskite-structure oxides." Journal of Physics: Condensed Matter 26, no. 47 (2014): 473203. http://dx.doi.org/10.1088/0953-8984/26/47/473203.

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33

Barilo, S. N., V. I. Gatalskaya, S. V. Shiryaev, et al. "Magnetic behavior of single crystalsof the perovskite oxides LaMn1−xCoxO3." physica status solidi (a) 199, no. 3 (2003): 484–90. http://dx.doi.org/10.1002/pssa.200306666.

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34

Zhou, Wenhan, Shengli Zhang, and Haibo Zeng. "Perovskite oxides as a 2D dielectric." Nature Electronics 5, no. 4 (2022): 199–200. http://dx.doi.org/10.1038/s41928-022-00757-3.

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35

Zaidi, M. A., J. Dhahri, I. Zeydi, T. Alharbi, and H. Belmabrouk. "Large magnetocaloric effect and critical behavior in La0.7Ba0.2Ca0.1Mn1−xAlxO3." RSC Advances 7, no. 69 (2017): 43590–99. http://dx.doi.org/10.1039/c7ra08162f.

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The structural, magnetic and magnetocaloric properties of La<sub>0.7</sub>Ba<sub>0.2</sub>Ca<sub>0.1</sub>Mn<sub>1−x</sub>Al<sub>x</sub>O<sub>3</sub> (0 ≤ x ≤ 0.1) perovskite manganite oxides have been investigated.
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36

Berta, Y., D. B. Studebaker, M. Todd, T. H. Baum, and Z. L. Wang. "Structure Characterization of Colossal Magnetoresistive Oxides." Microscopy and Microanalysis 4, S2 (1998): 572–73. http://dx.doi.org/10.1017/s1431927600022984.

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Magnetoresistance describes a phenomenon in which the electrical resistance of the material depends strongly on an externally applied magnetic field. Colossal magnetoresistance (CMR) was observed in a new class of oxides, (La,A)MnO3 (A = Ca, Sr, or Ba), and the Magnetoresistance ratio of ΔR/R(H)&gt; -100,000% has been reported in epitaxially grown La0.67Ca0.33MnO3 films. The new types of intrinsic magnetoresistive oxides offer exciting possibilities for improved magnetic sensors, magnetoresistive read heads, and magnetoresistive random access memory (MRAM).The CMR magnetic oxides have a perovs
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37

Jin, Xiang, Yi Lu, Yunbin Sun, et al. "Magnetic Properties and Magnetic Entropy Changes of Eu-Doped La0.9Sr0.1MnO3 Perovskite Manganese Oxides." Journal of Low Temperature Physics 195, no. 5-6 (2019): 403–18. http://dx.doi.org/10.1007/s10909-019-02171-0.

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38

Shanmugapriya, K., S. Periandy, and D. Mohan Radheep. "Investigation on magnetic and magnetocaloric properties of Sr0.25Ca0.75Mn0.9Ti0.1O3 perovskite." European Physical Journal Applied Physics 98 (2023): 42. http://dx.doi.org/10.1051/epjap/2023230030.

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Interest in magnetic refrigeration, which is based on the magnetocaloric effect (MCE), has greatly increased during the past two decades. As a less-polluting and more effective cooling technology than gas compression, magnetic refrigeration is one of the prominent and possible options. Perovskite Oxides played a major contribution for the development of magnetic refrigeration (MR). Sr0.25Ca0.75Mn1-xTixO3 (x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8) polycrystalline samples were synthesized by conventional solid-state reaction. Its cubic perovskite-type crystal structure is discovered to be o
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39

Hwang, Ji Yong, II Tae Kim, and Hyung Wook Choi. "Characteristics of Perovskite Solar Cells with ZnGa2O4:Mn Phosphor Mixed Polyvinylidene Fluoride Down-Conversion Layer." Journal of Nanoelectronics and Optoelectronics 16, no. 6 (2021): 855–60. http://dx.doi.org/10.1166/jno.2021.3013.

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To reduce the manufacturing cost of perovskite solar cells, soda-lime glass and transparent conducting oxides such as indium tin oxide and fluorine-doped tin oxide are the most widely used substrates and lighttransmitting electrodes. However, the transmittance spectra of soda-lime glass, indium tin oxide, and fluorinedoped tin oxide show that all light near and below 330 nm is absorbed; thus, with the use of these substrates, light energy near and below 330 nm cannot reach the perovskite light-absorbing layer. It is expected that the overall solar cell can be improved if the wavelength can be
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40

Yin, Yinong, Fanfan Shi, Guo-Qiang Liu, et al. "Spin-glass behavior and magnetocaloric properties of high-entropy perovskite oxides." Applied Physics Letters 120, no. 8 (2022): 082404. http://dx.doi.org/10.1063/5.0081688.

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The high-entropy concept has been recently proposed to be a promising paradigm to enhance the magnetocaloric properties of materials. Motivated by this, the magnetic properties and the magnetocaloric performance of two high-entropy perovskites (Dy1/4Ho1/4Er1/4Tb1/4)FeO3 and (Gd1/5Dy1/5Ho1/5Er1/5Tb1/5)FeO3 have been investigated. The magnetic measurements indicate that a spin-glass phase occurs at low temperatures in the high-entropy compounds, which is induced by the strong compositional disorder of rare-earth sublattice. The glassy state can lead to a sluggish magnetic transition and conseque
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41

Ishigaki, Takamasa, Shigeru Yamauchi, Kohji Kishio, Junichiro Mizusaki, and Kazuo Fueki. "Diffusion of oxide ion vacancies in perovskite-type oxides." Journal of Solid State Chemistry 73, no. 1 (1988): 179–87. http://dx.doi.org/10.1016/0022-4596(88)90067-9.

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42

Ishihara, Tatsumi, Hideaki Matsuda, and Yusaku Takita. "Oxide Ion Conductivity in Doped NdAlO3 Perovskite‐Type Oxides." Journal of The Electrochemical Society 141, no. 12 (1994): 3444–49. http://dx.doi.org/10.1149/1.2059351.

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43

Geguzina, G. A. "The complex oxides with octahedral structures: Existence areas and phase transitions." Journal of Advanced Dielectrics 10, no. 01n02 (2020): 2060013. http://dx.doi.org/10.1142/s2010135x20600139.

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The experimental and calculated data on the existence of complex oxides in solid state with the octahedral structures of four families, namely perovskites, Bi-containing layered perovskite-like ones, tetragonal tungsten bronzes and pyrochlores, and about their phase transitions are systematized and summarized on the basis of the quasi-elastic or geometric models of these structures. It has been established that similar existence areas and similar correlations between the interatomic bond strains in their structures, on the one hand, and the temperatures of their ferroelectric or antiferroelect
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44

Asano, Hidefumi, Norihito Koduka, Mikito Sugiyama, and Masaaki Matsui. "Growth and Properties of Half-Metallic Double Perovskite Thin Films." Materials Science Forum 475-479 (January 2005): 2197–202. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2197.

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Ferromagnetic oxides with ordered double-perovskites Sr2FeMoO6 and Sr2CrReO6 are known to be in a half-metallic ground state with high Curie temperatures Tc, and hence one of the promising materials for spin electronics. This paper reports epitaxial growth and micro-structural, magnetic, and electrical characterization of thin films of these oxides. It is shown that a coherent growth without strain relaxation, which is accomplished by the use of substrate or buffer layers with a small (0.1%) lattice match, is essential to obtain high quality films with both atomically flat surface and high mag
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45

Masrour, R., A. Jabar, G. Kadim, and M. Ellouze. "Crystallographic, electronic and magnetic properties of Sr2FeW1-xMoxO6 double perovskite oxides." Inorganic Chemistry Communications 134 (December 2021): 109047. http://dx.doi.org/10.1016/j.inoche.2021.109047.

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46

Li, Cheng, Xiang Jin, Huiqin Yun, Hongwei Chen, and Jianjun Zhao. "Magnetic and critical behavior studies of Ni2+-doped perovskite manganese oxides." Journal of Materials Science: Materials in Electronics 33, no. 4 (2022): 2052–66. http://dx.doi.org/10.1007/s10854-021-07410-3.

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47

Benali, A., M. Bejar, E. Dhahri, M. Sajieddine, M. P. F. Graça, and M. A. Valente. "Magnetic, Raman and Mössbauer properties of double-doping LaFeO3 perovskite oxides." Materials Chemistry and Physics 149-150 (January 2015): 467–72. http://dx.doi.org/10.1016/j.matchemphys.2014.10.047.

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48

Choi, Si-Young, Minseok Choi, Sung-Dae Kim, Hyung Jeen Jeen, and Young-Mok Rhyim. "Cationic Ordering and Magnetic Properties of Re-Based Double Perovskite Oxides." Microscopy and Microanalysis 21, S3 (2015): 125–26. http://dx.doi.org/10.1017/s1431927615001427.

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49

Tomioka, Y., A. Asamitsu, H. Kuwahara, et al. "Magnetic-field-induced metal-insulator transition in perovskite-type manganese oxides." Physica B: Condensed Matter 237-238 (July 1997): 6–10. http://dx.doi.org/10.1016/s0921-4526(97)00013-6.

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Righi, L., M. Amboage, J. Gutiérrez, J. M. Barandiarán, L. Fernández Barquı́n, and M. T. Fernández-Dı́az. "Magnetic and nuclear structure of the perovskite-like oxides (LaBi)0.7Ca0.3MnO3." Physica B: Condensed Matter 276-278 (March 2000): 718–19. http://dx.doi.org/10.1016/s0921-4526(99)01523-9.

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