PHASE TRANSITIONS OF BASI2 AT HIGH PRESSURES AND HIGH TEMPERATURES
PHASE TRANSITIONS OF BASI2 AT HIGH PRESSURES AND HIGH TEMPERATURES
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BASI2 在高压和高温下的相变
DOI：
10.1103/physrevb.58.11922
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发表时间：
1998
影响因子：
3.7
通讯作者：
O. Shimomura
中科院分区：
文献类型：
--
作者：
M. Imai;T. Hirano;T. Kikegawa;O. Shimomura
原位X射线衍射测量表明，BaSi 2 在压力高达7 GPa和温度高达1300 K时具有三种高压高温相：三角相、立方相和附加相。三角相存在于比之前报道的温度更低的温度下，并且附加相出现在之前报道的三角区域的压力-温度区域中。在高压下出现的结构与具有较小原子序数金属的其他碱土金属二硅化物在环境条件下出现的结构相同。这与纯元素或 AB 2 型化合物（例如 4A 族元素的二氧化物）的结构顺序不同。
In situ x-ray diffraction measurements reveal that BaSi 2 has three high-pressure, high-temperature phases: a trigonal, a cubic, and an additional phase, at pressures up to 7 GPa and temperatures up to 1300 K. The trigonal phase exists at lower temperatures than previously reported, and the additional phase appears in the pressure-temperature region reported as the trigonal region previously. The structures that appear at high pressures are the same as those at ambient conditions of the other alkaline-earth-metal disilicides with a smaller atomic number metal. This is different from structural sequence for pure elements or for AB 2-type compounds such as dioxides of 4A group elements.