Construction of an Adiabatic High-Pressure Calorimeter Using Helium Gas for Pressurization
Construction of an Adiabatic High-Pressure Calorimeter Using Helium Gas for Pressurization
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氦气加压绝热高压热量计的构建
DOI：
10.1246/bcsj.60.1269
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发表时间：
1987
影响因子：
4
通讯作者：
H. Suga
中科院分区：
文献类型：
--
作者：
O. Yamamuro;M. Oguni;T. Matsuo;H. Suga
以氦气为传压介质，构造了一种新型绝热高压量热计。它在温度范围从12到370 K的恒定压力下工作，最高可达250 MPa。样品电池由Be-Cu合金制成，内部体积为26 cm3。压力传递管连接外部压力控制系统，在整个压力和温度范围内，自动保持内部压力恒定在±1kpa。因此，在热容测量过程中，任何试样遵循的热力学路径都可以明确地描述。在25 ~ 370 K的温度范围内，分别测量了负载158.9 MPa和无He气体的样品电池的热容。压缩He气体的热容数据误差在0.3%以内。因此，目前的量热计使我们能够将各种材料的低温热力学研究扩展到高压，而不会显著损失所要求的精度。
A novel adiabatic high-pressure calorimeter was constructed with using helium gas as a pressure transmitting medium. It works under a constant pressure up to 250 MPa in the temperature range from 12 to 370 K. Sample cell is made of Be–Cu alloy and has internal volume of 26 cm3. The pressure transmitting tube is connected to an external pressure-control system, which enables to keep automatically the inner pressure constant within ±1 kPa over the whole pressure and temperature ranges. Thus the thermodynamic path that any specimen follows during the heat capacity measurement can be described unambiguously. Heat capacities of the sample cells loaded without and with 158.9 MPa He gas were measured in the temperature range from 25 to 370 K. The imprecision of heat capacity data of the compressed He gas was within 0.3%. Thus the present calorimeter enables us to extend the low-temperature thermodynamic study on various kinds of materials to high pressures without a significant loss of the claimed precision.