Crystal and Magnetic Structure in Co-Substituted BiFeO3

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• 作者：Izabela Sosnowska ; Masaki Azuma ; Rados艂aw Przenios艂o ; Dariusz Wardecki ; Wei-tin Chen ; Kengo Oka ; Yuichi Shimakawa
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：November 18, 2013
• 年：2013
• 卷：52
• 期：22
• 页码：13269-13277
• 全文大小：445K
• 年卷期：v.52,no.22(November 18, 2013)
• ISSN：1520-510X

文摘

Ultra-high-resolution neutron diffraction studies of BiFe_0.8Co_0.2O₃ show a transition from a cycloidal space modulated spin structure at T = 10 K to a collinear G-type antiferromagnetic structure at T = 120 K. The model of antiparallel directions of Fe³⁺ and Co³⁺ magnetic moments at the shared Wyckoff position describes well the observed neutron diffraction intensities. On heating above RT, the crystal structure of BiFe_0.8Co_0.2O₃ changes from a rhombohedral R3c to a monoclinic Cm. At 573 K only the Cm phase is present. The collinear C-type antiferromagnetic structure is present in the Cm phase of BiFe_0.8Co_0.2O₃ at RT after annealing.