Pressure-Dependent Thermal Expansion Coefficient by a Diamond Anvil Cell
Pressure-Dependent Thermal Expansion Coefficient by a Diamond Anvil Cell
复制标题
金刚石砧室的压力相关热膨胀系数
DOI：
10.1007/s10765-021-02945-3
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发表时间：
2022
影响因子：
2.2
通讯作者：
Shizhong Yang
中科院分区：
文献类型：
--
作者：
Jinyuan Yan;Shizhong Yang
热膨胀系数（α p）是高压研究中必不可少的热物理量。热膨胀系数是等压加热过程中体积随温度的变化。虽然金刚石对顶砧（DAC）的等压加热过程一直是通过保持加热过程中的压力恒定来进行的，但高温高压下的压力确定几十年来一直存在争议。本文提出了一种不需要在高温高压下确定压力的可逆加热/冷却方法。用DAC测定了MgO在9.5GPa压力下可逆加热/冷却时的热膨胀系数，其结果与大容量压力机通过手动调节负荷/压力进行等压加热时的结果相吻合。
A thermal expansion coefficient (α p ) is an essential thermophysical quantity for high pressure research. The thermal expansion coefficient is the volume change over temperature in an isobaric heating process. Although isobaric heating processes for diamond anvil cell (DAC) have been conducted by keeping the pressure constant during heating, pressure determination at high temperature high pressure is debatable for decades long. In this paper, a revertible heating/cooling approach is presented, while its pressure determination at high temperature high pressure is not required. A pressure-dependent thermal expansion coefficient of MgO at 9.5 GPa by revertible heating/cooling was determined by a DAC and its result matches with the one collected by large volume press, whose isobaric heating was conducted by manually adjusting its load/pressure.