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Bi1-ySmyFe1-xTixO3 ceramics with compositions at the rhombohedral- orthorhombic morphotropic phase boundary (y = 0.1, 0.12, 0 < x < 0.1) were prepared by solid state reaction method. Analysis of the crystal structure of the compounds based on the results of laboratory and synchrotron X-ray diffraction measurements as well as Raman spectroscopy experiments revealed a coexistence of the rhombohedral phase (SG R3c) and the anti-polar orthorhombic phase (SG Pbam) in the compounds Bi0.88Sm0.12Fe1-xTixO3 with 0 < x < 0.1; the compounds Bi0.9Sm0.10Fe1-xTixO3 are characterized by the mixed structural state for the concentration range 0 < x < 0.06 and by the single phase rhombohedral state within 0.06 < x < 0.1. Room temperature magnetization measurements demonstrate a gradual increase of remanent magnetization with Ti content in the compounds of both systems up to the maximal value of MR = 0.28 emu/g for compounds with x = 0.06 which is followed by a decrease in magnetization with further titanium doping. Temperature decrease leads to a reduction of remanent magnetization which is mainly caused by a partial recovery of spatially modulated spin structure occurred in the compounds of both systems. Time aging of the compounds for about 1 year leads to a drastic increase of MR, which is caused by a change in the structural phase ratio, homogeneity of the structural state and a contribution of unbounded spins demonstrated by low field measurements. Subjecting of the annealed compounds to external electric field of E = 40kV/cm leads to a decrease of magnetization associated with backward structural transformations and redistribution of the local structural defects in the compounds.

権利情報:

• In Copyright
  

キーワード: BiFeO3, SPring-8, Synchrotron

刊行年月日: 2024-08-14

出版者: Elsevier BV

掲載誌:

• Ceramics International (ISSN: 02728842) vol. 50 issue. 22 p. 44806-44813

研究助成金:

• National Natural Science Foundation of China No.U2067216
• National Aerospace Science Foundation of China No.U2067216
• Vancouver Island University
• Russian Science Foundation 23-19-00347

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4901

公開URL: https://doi.org/10.1016/j.ceramint.2024.08.237

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更新時刻: 2024-10-28 10:05:08 +0900

MDRでの公開時刻: 2026-08-14 08:29:22 +0900