期刊
MATERIALS LETTERS
卷 65, 期 12, 页码 1970-1972出版社
ELSEVIER
DOI: 10.1016/j.matlet.2011.04.009
关键词
BiFeO3; Multiferroics; Crystal structure; Phase transitions
资金
- Foundation for Science and Technology of Portugal (FCT)
- BRFFI [T10R-119]
Regularities of the structural phase evolution associated with changing ionic radius of the A-site dopants in Bi(7/8)Ln(1/8)FeO(3) (Ln = La-Dy) series were investigated by X-ray diffraction technique at room temperature. A strong tendency to the structural phase separation was found. Initial polar rhombohedral R3c structure characteristic of pure bismuth ferrite is retained only for La-doped compound. For most other samples, intrinsic polar-antipolar R3c + Pnam (Ln = Pr, Nd, Sm), antipolar-nonpolar Pnam + Pnma (Ln = Gd), or polar-nonpolar R3c + Prima (Ln = Tb, Dy) phase coexistence was revealed. Investigation of temperature evolution of crystal structure of La-doped compound performed with a neutron powder diffraction technique found that its high-temperature paraelectric phase had the orthorhombic Pnma symmetry. (C) 2011 Elsevier B.V. All rights reserved.
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