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为了解高温高压条件下,α-β石英相变过程中的弹性性质,在0.7～1.8GPa,室温～1120℃条件下,利用多顶砧波速测量装置,采用脉冲反射-透射法,测量了α石英以及相变为β石英的纵波速度,弹性纵波穿过单晶α石英的方向为平行结晶轴X方向。实验结果表明,随温度升高,α石英的纵波速度开始非线性降低,之后,快速升高,这一现象是由于α-β石英相变引起的,依据晶体对称性与弹性参数的关系确定了α石英的弹性参数(C_(11)),及其随温度和压力的变化关系,同时获得了β石英的弹性参数(C_(11)),实验证实,测量α-β石英相变时的纵波速度,不仅是确定α-β石英相变温度和压力的一种方法,也是校正高压腔体温度和压力的有力手段。
In order to understand the elastic properties of α-β quartz under the conditions of high temperature and high pressure, the α / β quartz crystal was measured by pulse reflection-transmission method under the conditions of 0.7 ~ 1.8GPa and room temperature ~ 1120 ℃. Quartz and the P-quartz compressional wave velocity. The direction of the elastic longitudinal wave passing through the monocrystalline α-quartz is the X direction of the parallel crystallographic axis. The experimental results show that as the temperature increases, the longitudinal wave velocity of α-quartz begins to decrease non-linearly and then increases rapidly. This phenomenon is caused by the phase transformation of α-β quartz and is determined by the relationship between the symmetry and the elastic parameters (C_ (11)) and their relationship with temperature and pressure were obtained. At the same time, the elastic parameters (C_ (11)) of β-quartz were obtained. Speed, not only to determine α-β quartz phase transition temperature and pressure of a method, but also to correct high-pressure chamber temperature and pressure a powerful tool.