High pressure synthesis, crystal structure and physical properties of a new Ni(II) perovskite BiNiO3
High pressure synthesis, crystal structure and physical properties of a new Ni(II) perovskite BiNiO3
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DOI：
10.1039/b206022a
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发表时间：
2002-01-01
影响因子：
--
通讯作者：
Kato, K
中科院分区：
文献类型：
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作者：
Ishiwata, S;Azuma, M;Kato, K
在氧化气氛下，以6gpa的高压合成了一种新型三斜型钙钛矿BiNiO3。基于同步加速器x射线粉末衍射和键价计算的结构改进揭示了Bi离子歧化成Bi3+和Bi5+，两者都位于畸变氧八面体中。由于Bi5+的存在，Ni的氧化态为+2，而不是预期的+3；BiNiO3表现出局域自旋为S = 1的绝缘行为。
A new triclinic perovskite, BiNiO3, has been synthesized at a high pressure of 6 GPa in an oxidizing atmosphere. Structure refinements based on synchrotron X-ray powder diffraction and bond-valence calculations revealed a disproportionation of the Bi ions into Bi3+ and Bi5+, both being located in distorted oxygen octahedra. Because of the presence of Bi5+, the oxidation state of Ni was +2, rather than +3 as had been expected; BiNiO3 thus showed insulating behavior with localized spins of S = 1.