학술논문
Adapting a continuous flow cryostat and a plate DAC to do high pressure Raman experiments at low temperatures.
Document Type
Article
Source
Subject
*LOW temperatures
*SPECIFIC heat capacity
*CRYOSTATS
*FINITE element method
*DIAMOND anvil cell
*SPECIFIC heat
*TEMPERATURE measurements
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Language
ISSN
0034-6748
Abstract
We present a method for modifying a continuous flow cryostat and a steel plate DAC (Diamond Anvil Cell) to perform high pressure micro-Raman experiments at low temperatures. Despite using a steel DAC with a lower specific heat capacity (∼335 J/kg K), this setup can routinely perform high pressure (∼10 GPa) measurements at temperatures as low as 26 K. This adaptation is appropriate for varying the temperature of the sample while keeping it at a constant pressure. We determined that the temperature variation across the sample chamber is about 1 K using both direct temperature measurements and finite element analysis of the heat transport across the DAC. We present Raman spectroscopy results on elemental selenium at high pressures and low temperatures using our modified setup. [ABSTRACT FROM AUTHOR]