Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 34, Issue 25, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-648X/ac6389
Keywords
magnetoelectric coupling; doping; bismuth ferrite; neutron diffraction
Categories
Funding
- National Natural Science Foundation of China [12174274]
- [P2018091000001]
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This study investigated the crystal and magnetic structures of strontium-doped BiFeO3 using neutron powder diffraction and the Rietveld method. The results showed that the structural deformations and antiferromagnetic order varied with chemical composition but had little variation with temperature. It was concluded that there is no significant coupling between antiferromagnetism and ferroelectricity in Sr-doped BiFeO3 and pure BiFeO3.
We report results from a study of the crystal and magnetic structures 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.
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