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BiFeO3-related perovskite-type materials attract a lot of attention from viewpoints of applications and fundamental science. In this work, we prepared two modification of heavily Mn-doped BiFeO3: BiFe0.6Mn0.4O3. A high-pressure (HP) modification was prepared at about 6 GPa and 1400 K. An ambient pressure (AP) modification was prepared by heating the HP modification at 780 K in air at AP (post-synthesis annealing). Crystal structures of both modifications and in-situ transformation were investigated with synchrotron powder X-ray diffraction. The transformation starts at about 700 K and finishes at about 780 K. The HP modification crystallizes in space group Pnma with a = 5.57956 Å, b = 15.70576 Å, c = 11.22557 Å, and the AP modification crystallizes in space group Pbam with a = 5.63839 Å, b = 11.2710 Å, c = 7.75923 Å (all parameters are at room temperature). Such post-synthesis annealing of the HP modification (conversion polymorphism) is the only way to prepare the Pbam modification of the oxygen stoichiometric BiFe0.6Mn0.4O3. Magnetic properties of both modifications are reported. The Néel temperatures are TN = 350 K (HP) and TN = 335 K (AP). The HP modification shows larger spin canting. Both modifications show negative magnetization phenomena at low temperatures in low magnetic fields.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

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

刊行年月日: 2024-08-19

出版者: MDPI AG

掲載誌:

• Inorganics (ISSN: 23046740) vol. 12 issue. 8 p. 226-226 226

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原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.3390/inorganics12080226

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更新時刻: 2024-08-31 08:30:24 +0900

MDRでの公開時刻: 2024-08-31 08:30:24 +0900