Pressure‐Induced Phase Transformation in NaCl
Pressure‐Induced Phase Transformation in NaCl
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DOI：
10.1063/1.1655752
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发表时间：
1968
影响因子：
3.2
通讯作者：
W. Bassett;Taro Takahashi;H. Mao;J. Weaver
中科院分区：
文献类型：
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作者：
W. Bassett;Taro Takahashi;H. Mao;J. Weaver
在大约300 kbar和室温下，在金刚石砧高压单元中观察到NaCl中的压力诱导相变，该相变快速可逆地发生。X射线衍射数据表明，高压多晶型物具有氯化铯（B2）结构。在相变压力下，低压相（B1）和高压相（B2）的晶格参数分别为4.872±0.004 A和2.997±0.004 A，相变的体积变化为− 1.00±0.05 cm 3 mole−1。相变的熵变由体积变化和弗里茨等人的冲击实验获得的高温高压数据计算得出，为1.5±0.3 cal deg−1 mole−1。与其他碱金属氯化物的比较表明，B1-B2相变的熵变和体积变化之间存在线性关系。一个热力学方程占这种关系已推导出的假设下，Gruneise…
A pressure‐induced phase transformation in NaCl which occurs rapidly and reversibly at approx 300 kbar and room temperature has been observed in a diamond‐anvil high‐pressure cell. X‐ray diffraction data indicate that the high‐pressure polymorph has the cesium chloride (B2) structure. The lattice parameters of the low‐ (B1) and high‐ (B2) pressure phases at the transformation pressure are, respectively, 4.872±0.004 A and 2.997±0.004 A, and the volume change for the transformation is − 1.00±0.05 cm3 mole−1. The entropy change for the phase transformation has been calculated from the volume change and from the high‐temperature‐pressure data obtained by the shock experiments of Fritz et al. and found to be 1.5±0.3 cal deg−1 mole−1. Comparison with other alkali chlorides indicates that a linear relationship exists between the entropy change and the volume change for the B1‐B2 phase transformation. A thermodynamic equation accounting for this relationship has been derived under the assumption that the Gruneise...