日本結晶学会誌
Online ISSN : 1884-5576
Print ISSN : 0369-4585
最近の研究から
平面四配位を有する酸化物における圧力誘起相転移
山本 隆文陰山 洋
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2016 年 58 巻 6 号 p. 261-266

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A spin state transition in a square planar coordinated iron was found in SrFeO2 and Sr3Fe2O5 under high pressure. This transition occurs as a consequence of enhanced Fe-Fe direct interactions between adjacent face-to-face FeO4 square planar units. We also found a pressure-induced structural transition in Sr3Fe2O5, which is viewed as a B1(NaCl structure) to B2(CsCl structure) structural transition. Such a B1-B2 structural transition generally occurs in intergrowth system consisting of rock-salt blocks and square-planar blocks, as found in A2MO3 (A=Ca, Sr; M=Cu, Pd). An empirical relation between the structural transition pressure Ps and the ionic radius for the binary system holds well for the intergrowth structure, which indicates that the square-planar block is highly compressible along the out-of-plane direction.

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© 2016 日本結晶学会
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