Crystal structure, electronic structure, and magnetic properties of bismuth-strontium ferrites

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• 作者：Li ; J. ; Duan ; Y. ; He ; H. ; Song ; D.
• 关键词：Oxide materials ; Transition metal compounds ; Magnetically ordered materials ; Mö ; ssbauer spectroscopy ; Magnetic measurements
• 刊名：Journal of Alloys and Compounds
• 出版年：2001
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：February 9, 2001
• 卷：315
• 期：1-2
• 页码：259-264
• 文件大小：158 K

摘要

Bi_1−xSr_xFeO₃ compounds were studied by X-ray diffraction, Mössbauer effect, and magnetic measurements. The replacement of trivalent Bi by divalent Sr leads to a change of the lattice symmetry from the rhombohedrally distorted perovskite of BiFeO₃ to the cubic one of SrFeO_2.97 and results in oxygen deficiency in the lattice. The oxygen-deficient Bi_1−xSr_xFeO₃ compounds have two different crystal sites for iron ions, i.e., the octahedral sites and the oxygen-deficient tetrahedral sites. However, the iron ions both on the octahedral sites and the tetrahedral sites are in the trivalent state. Bi_1−xSr_xFeO₃ exhibits the presence of both antiferromagnetic and weak ferromagnetic interactions simultaneously. As the Sr content increases, the susceptibility and magnetization of Bi_1−xSr_xFeO₃ decrease.