Experimental evidence of high pressure during crystallization of glass – The formation of an orthorhombic high-pressure BaF2 phase
Experimental evidence of high pressure during crystallization of glass – The formation of an orthorhombic high-pressure BaF2 phase
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DOI：
10.1016/j.scriptamat.2010.01.053
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发表时间：
2010-05
影响因子：
6
通讯作者：
C. Bocker;I. Avramov;C. Rüssel
中科院分区：
文献类型：
--
作者：
C. Bocker;I. Avramov;C. Rüssel
在Na_2O/K_2O/Al_2O_3/KF/BaF_2/SiO_2系统中，对三种不同的玻璃进行了晶化。冷却后，在一个样品中，只有立方BaF 2被检测到，在第二个样品中，主要是斜方晶的修改被发现，并在第三个样品中，两个阶段都存在。根据文献，斜方晶相仅在高压下是热力学稳定的。在结晶过程中，压应力不能松弛，形成正交相。这是第一个实验证据的高压形成过程中的玻璃结晶。
Three different glasses in the system Na2O/K2O/Al2O3/KF/BaF2/SiO2were crystallized. After cooling, in one sample only cubic BaF2was detected, in the second sample predominantly the orthorhombic modification was found, and in the third sample, both phases were present. The orthorhombic phase according to the literature is thermodynamically stable only at high pressures. During crystallization, compressive stresses cannot relax and the orthorhombic phase is formed. This is the first experimental evidence of the formation of high pressure during crystallization of glass.