Collapsing cristobalitelike structures in silica analogues at high pressure -: art. no. 015503
Collapsing cristobalitelike structures in silica analogues at high pressure -: art. no. 015503
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DOI：
10.1103/physrevlett.91.015503
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发表时间：
2003-07-04
影响因子：
8.6
通讯作者：
Tse, JS
中科院分区：
文献类型：
--
作者：
Haines, J;Chateau, C;Tse, JS
用x射线衍射和理论方法研究了高压下二氧化硅三元类似物BPO4和BAsO4的方石样形态。这些化合物的行为代表了一种极端情况，即组成四面体的倾斜角在高压下以惊人的方式增加，导致拓扑结构从类似方石的框架向“坍塌方石”结构发生重大变化。这些化合物提供了框架结构在没有中间相变的情况下以连续方式坍塌成紧密堆积形式的第一个例子。
The cristobalitelike forms of the ternary silica analogues BPO4 and BAsO4 were investigated at high pressure by x-ray diffraction and theoretical methods. The behavior of these compounds represents an extreme case in which the tilt angle of the constituent tetrahedra increases in a spectacular way at high pressure resulting in a major change in topology from a cristobalitelike framework towards a "collapsed cristobalite" structure. These compounds provide the first examples of the collapse of a framework structure to a close-packed form in a continuous manner without an intervening phase transition.