Abstract

The high-precision volume measurements of the g-As₂S₃ glass have been performed at high hydrostatic pressures up to 8.6 GPa, and room temperature. The glass behaves elastically during compression only at pressures up to 1.5 GPa; at higher pressures, a smooth transformation and inelastic density relaxation (logarithmic in time) take place. In the initial segment, the bulk modulus is B = 13.5 ± 0.15 GPa and its pressure derivative is dB/dP = 6.2 ± 0.2. When pressure increases further, the relaxation rate passes through a maximum at 4 GPa, which is accompanied by a bulk modulus plateau, and then decreases and remains noticeable up to the maximum pressure. When pressure decreases, inelastic behavior and the reverse transformation are observed at pressures below 4 GPa. After pressure release, the g-As₂S₃ glasses have a residual densification of about 3% and their optical properties differ substantially from the initial ones. The glass density relaxes to a quasi-equilibrium value in several months under normal conditions. The kinetics of the Raman spectrum and the optical absorption edge of the glasses during relaxation is studied under normal pressure. The data on compressibility of glasses and comparative Raman studies of initial and compacted glasses show that at pressures up to 9 GPa, there is a strong increase in chemical disorder in the glass, while there is no significant change in the coordination number.

中文翻译：

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g-As 2 S 3玻璃在高达8.6 GPa的高静水压下的可压缩性和松弛度的高精度研究

摘要

g-As ₂ S ₃玻璃的高精度体积测量是在高达8.6 GPa的高静水压力和室温下进行的。玻璃在压缩过程中仅在最高1.5 GPa的压力下才具有弹性。在较高的压力下，会发生平稳的转变和非弹性密度松弛（时间为对数）。在初始段中，体积模量为B = 13.5±0.15 GPa，其压力导数为dB / dP＝ 6.2±0.2。当压力进一步增加时，弛豫率在4 GPa处通过最大值，并伴随着体积模量平稳期，然后降低，直至达到最大压力时仍保持明显。当压力降低时，在低于4 GPa的压力下会观察到非弹性行为和反向转变。释放压力后，g-As ₂ S ₃玻璃具有约3％的残留致密化，并且它们的光学性能与初始玻璃有很大不同。在正常条件下，玻璃密度会在几个月内松弛到准平衡值。在常压下研究了拉曼光谱的动力学和玻璃在弛豫过程中的光学吸收边缘。有关玻璃可压缩性的数据以及对初始玻璃和压实玻璃的拉曼比较研究表明，在压力高达9 GPa的情况下，玻璃中的化学无序性显着增加，而配位数没有明显变化。