Crystal structure of monoclinic ilvaite and the nature of the monoclinic-orthorhombic transition at high pressure
Crystal structure of monoclinic ilvaite and the nature of the monoclinic-orthorhombic transition at high pressure
复制标题
单斜钙钛矿的晶体结构和高压下单斜晶-斜方晶相转变的性质
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
R. Hazen
中科院分区：
文献类型：
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作者：
L. Finger;R. Hazen
Crystal structures of monoclinic ilvaites from Elba, Italy, and Seriphos, Greece, have been refined and an Fe 2 + — Fe 3 + order parameter has been related to the monoclinic angle β. Lattice constants have been determined as a function of pressure in a diamond-anvil cell. At high pressure the 0-angle decreases and the structure becomes orthorhombic. This transition, which is not first order, may be described as a λ-point, which has both order-disorder and displacive character. The electron disorders at the λ-point; however, there is residual short-range order above this point. One consequence is that the transition conditions observed by calorimetry are not necessarily the same as those of crystallography.
