期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 92, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/5.0009663
关键词
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资金
- COMPRES, the Consortium for Materials Properties Research in Earth Sciences, under NSF [EAR 1606856]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
In this study, a ring-heater design was developed for BX90 diamond anvil cells (DACs) to achieve a homogeneous temperature field and reliable temperature measurement. This design allows for in situ studies of samples and determination of thermal expansion coefficient.
Resistive heating of a sample in a diamond anvil cell (DAC) can generate a homogeneous temperature field across the sample chamber with reliable temperatures measured by a thermocouple. It is of importance in experiments aiming at exploring phase diagrams and quantifying thermoelastic properties of materials. Here, we present a ring-heater design developed for BX90 diamond anvil cells (DACs). It is made of a ring-shaped aluminum oxide holder hosting a tungsten wire coil inside and coupled with Ar + 2% H-2 gas to prevent oxidation during experiment. This modular plug-and-play design enables in situ studies of samples via x-ray diffraction up to a temperature of 1700 K. Temperature in the BX90 sample volume as measured through a thermocouple was calibrated using the melting point of gold. As an application of this design, we report the thermal expansion coefficient of MgO at 9.5(1) GPa.
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