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• 作者：Peter S. Berdonosov ; Elena S. Kuznetsova ; Valery A. Dolgikh ; Alexei V. Sobolev ; Igor A. Presniakov ; Andrei V. Olenev ; Badiur Rahaman ; Tanusri Saha-Dasgupta ; Konstantin V. Zakharov ; Elena A. Zvereva ; Olga S. Volkova ; Alexander N. Vasiliev
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：June 2, 2014
• 年：2014
• 卷：53
• 期：11
• 页码：5830-5838
• 全文大小：532K
• 年卷期：v.53,no.11(June 2, 2014)
• ISSN：1520-510X

文摘

We report the synthesis and characterization of the new bismuth iron selenite oxochloride Bi₂Fe(SeO₃)₂OCl₃. The main feature of its crystal structure is the presence of a reasonably isolated set of spin S = ⁵/₂ zigzag chains of corner-sharing FeO₆ octahedra decorated with BiO₄Cl₃, BiO₃Cl₃, and SeO₃ groups. When the temperature is lowered, the magnetization passes through a broad maximum at T_max 鈮?130 K, which indicates the formation of a magnetic short-range correlation regime. The same behavior is demonstrated by the integral electron spin resonance intensity. The absorption is characterized by the isotropic effective factor g 鈮?2 typical for high-spin Fe³⁺ ions. The broadening of ESR absorption lines at low temperatures with the critical exponent 尾 = ⁷/₄ is consistent with the divergence of the temperature-dependent correlation length expected for the quasi-one-dimensional antiferromagnetic spin chain upon approaching the long-range ordering transition from above. At T_N = 13 K, Bi₂Fe(SeO₃)₂OCl₃ exhibits a transition into an antiferromagnetically ordered state, evidenced in the magnetization, specific heat, and M枚ssbauer spectra. At T < T_N, the ⁵⁷Fe M枚ssbauer spectra reveal a low saturated value of the hyperfine field H_hf 鈮?44 T, which indicates a quantum spin reduction of spin-only magnetic moment 螖S/S 鈮?20%. The determination of exchange interaction parameters using first-principles calculations validates the quasi-one-dimensional nature of magnetism in this compound.