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Perovskite-type materials containing Bi3+ cations at the A sites are interesting from viewpoints of applications and fundamental science as the lone pair of Bi3+ cations often stabilizes polar, ferro-electric structures. It can be illustrated by a lot of discoveries of different new functionalities in bulk and thin films of BiFeO3 and its derivatives. In this work, we investigated solid solutions of BiCr1-xFexO3 with 0.1 < x < 0.4 prepared by a high-pressure (HP) method and post-synthesis an-nealing at ambient pressure (AP). HP-BiCr1-xFexO3 modifications with 0.1 < x < 0.3 were mixtures of two phases with space groups C2/c and Pbam, and the amount of the C2/c phase decreased with increasing x. The amount of the C2/c phase was also significantly decreased in AP-BiCr1-xFexO3 modifications, and the C2/c phase almost disappeared in AP-BiCr1-xFexO3 with 0.2 < x < 0.3. Fun-damental, strong reflections of HP-BiCr1-xFexO3 and AP-BiCr1-xFexO3 were almost unchanged; on the other hand, weak superstructure reflections were different and showed clear signs of strong anisotropic broadening and incommensurate positions. These structural features prevented us from determining their room-temperature structures. On the other hand, HP-BiCr1-xFexO3 and AP-BiCr1-xFexO3 showed high-temperature structural phase transitions to the GdFeO3-type Pnma modification at Tsrt = 450 K (x = 0.1), Tsrt = 480 K (x = 0.2), Tsrt = 510 K (x = 0.3), and Tsrt = 546 K (x = 0.4). Crystal structures of the GdFeO3-type Pnma modifications of all the samples were investigated by synchrotron powder X-ray diffraction. Magnetic properties of HP-BiCr1-xFexO3 and AP-BiCr1-xFexO3 were quite close to each other (HP vs AP), and the x = 0.2 samples demonstrated negative magnetization phenomena without signs of the exchange bias effect.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: multiferroics, doped BiFeO3, BiCrO3, high-pressure synthesis, irreversible transformations, conversion polymorphism, incommensurate structures

刊行年月日: 2025-03-18

出版者: MDPI AG

掲載誌:

• Inorganics (ISSN: 23046740) vol. 13 issue. 3 91

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.3390/inorganics13030091

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更新時刻: 2025-11-08 08:30:07 +0900

MDRでの公開時刻: 2025-11-08 08:21:17 +0900