四方晶系
等结构
八面体
结晶学
离子
盐(化学)
材料科学
晶体结构
公式单位
化学
物理化学
有机化学
出处
期刊:Zeitschrift für Kristallographie
[Oldenbourg Wissenschaftsverlag]
日期:1990-02-01
卷期号:190 (3-4): 161-169
被引量:5
标识
DOI:10.1524/zkri.1990.190.3-4.161
摘要
Abstract Thirteen new phases, Li 2 MXO 4 , have been synthesised. Nine of these, labelled α , with: M = Mg, Mn, Fe, Co, Zn, have the tetragonal α -LiFeO 2 , rock salt-related structure and are isostructural with previously reported Li 2 MgZrO 4 . In their structures, M and X ions are disordered over the octahedral Fe sites of α -LiFeO 2 . Three phases, labelled β , with: MX = NiHf, CuZr, CuHf, have closely related structures but with a lower symmetry space group and significantly different c / a ratios for their tetragonal unit cells. A structural model involving ordering of M and X ions is proposed in which the driving force for ordering is a Jahn-Teller distortion associated with Ni and Cu. Two phases: X = NiHf, NiZr, form other high temperature polymorphs which are also related structurally to rock salt but with varying degrees of cation disorder.
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