Effects of Composition, Pressure, and Temperature on the Elastic Properties of SiO2–TiO2 Glasses: An Integrated Ultrasonic and Brillouin Study
Effects of Composition, Pressure, and Temperature on the Elastic Properties of SiO2–TiO2 Glasses: An Integrated Ultrasonic and Brillouin Study
复制标题
成分、压力和温度对 SiO2-TiO2 玻璃弹性性能的影响：超声和布里渊综合研究
作者：
M. Manghnani;Q. Williams;T. Matsui;P. C. Schultz;C. Kurkjian
我们系统地研究了通过脉冲叠加（PSP）超声技术，测量了八种SiO2-TiO 2玻璃的（ρ、VP、VS、K、μ和σ），组成为1.3至14.7wt%TiO2，与压力（最高0.5 GPa）的函数，和两个组成（1.3和9.4重量%的TiO 2）高达~5.7 GPa的布里渊散射在金刚石对顶砧单元。还在退火至1020 °C之后测量参数。除了K和σ之外，成分-弹性关系或多或少是线性的;退火只是使关系更加均匀（更少分散）。在环境压力和高压下，超声波和布里渊测量之间有很好的一致性。随着TiO 2含量的增加，压力引起的异常弹性行为（负的dVP/dP和dK/dP）变得更负（更可压缩）。相应地，随着TiO 2含量的增加，声学Grüneisen参数变得更负，在约8-10 wt% TiO 2附近达到最小值。两种玻璃（1.3和9.4重量% TiO 2）中的低压和高压超声以及布里渊VP和VS的比较显示出极好的一致性，很好地定义了低压下的可逆弹性行为和高压（≥5.7 GPa）下的不可逆行为。这一结果与我们以前的高压拉曼研究一致，表明在类似的压力范围内发生了不可逆的结构变化。
We have systematically investigated the elastic properties (ρ, VP, VS, K, μ and σ) of eight SiO2–TiO2 glasses, varying in composition from 1.3 to 14.7 wt% TiO2, as a function of pressure up to 0.5 GPa by the pulse superposition (PSP) ultrasonic technique, and two compositions (1.3 and 9.4 wt% TiO2) up to ~5.7 GPa by Brillouin scattering in a diamond anvil cell. The parameters were also measured after annealing to 1020 °C. Composition–elasticity relationships, except for K and σ, are more or less linear; the annealing simply makes the relationships more uniform (less scatter). There is excellent agreement between the ultrasonic and Brillouin measurements at ambient and high pressure. The pressure-induced anomalous elastic behavior (negative dVP/dP and dK/dP) becomes more negative (more compressible) with the increasing TiO2 content. Correspondingly, the acoustic Grüneisen parameters become more negative with increases in the TiO2 content, reaching a minimum near ~8–10 wt% TiO2. The comparison of the low- and high-pressure ultrasonic and Brillouin VP and VS in two glasses (1.3 and 9.4 wt% TiO2) shows excellent agreement, defining the reversible elastic behavior at low pressures and irreversible behavior at higher pressures (≥5.7 GPa) well. This result is consistent with our previous high-pressure Raman study showing an irreversible structural change in a similar pressure range.