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Neutron powder-diffraction study of phase transitions in strontium-doped bismuth ferrite: 1. Variation with chemical composition

Ma, Zhengzheng, Tan, Lei, Huang, Haijun, He, Lunhua, Chen, Jie, Lu, Huaile, Deng, Sihao, Yin, Wen, Zhang, Junrong, Tian, Haolai, and others. (2022) Neutron powder-diffraction study of phase transitions in strontium-doped bismuth ferrite: 1. Variation with chemical composition. Journal of Physics: Condensed Matter, 34 (25). Article Number 255401. ISSN 0953-8984. E-ISSN 1361-648X. (doi:10.1088/1361-648X/ac6389) (KAR id:94068)

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We report results from a study of the crystal structure of strontium-doped BiFeO3 using neutron powder diffraction and the Rietveld method. Measurements were obtained over a wide range of temperatures from 300–800 K for compositions between 10–16% replacement of bismuth by strontium. The results show a clear variation of the two main structural deformations – symmetry-breaking rotations of the FeO6 octahedra and polar ionic displacements that give ferroelectricity – with chemical composition, but relatively little variation with temperature. On the other hand, the antiferromagnetic order shows a variation with temperature and a second order phase transition consistent with the classical Heisenberg model. There is, however, very little variation in the behaviour of the antiferromagnetism with chemical composition, and hence with the degree of the structural symmetry-breaking distortions. We therefore conclude that there is no significant coupling between antiferromagnetism and ferroelectricity in Sr-doped BiFeO3 and, by extension, in pure BiFeO3.

Item Type: Article
DOI/Identification number: 10.1088/1361-648X/ac6389
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Chemistry and Forensics
Depositing User: Donna Arnold
Date Deposited: 19 Apr 2022 10:46 UTC
Last Modified: 01 Jun 2022 14:59 UTC
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Arnold, Donna C.:
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