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Title: Pressure-Dependent Thermal Expansion Coefficient by a Diamond Anvil Cell

Journal Article · · International Journal of Thermophysics
ORCiD logo [1];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Southern University and A & M College
  2. Southern Univ. and A&M College, Baton Rouge, LA (United States)

A thermal expansion coefficient (αp) is an essential thermophysical quantity for high-pressure research. The thermal expansion coefficient is the volume change over the 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. We report a pressure-dependent thermal expansion coefficient of MgO at 9.5 GPa by reversible heating/cooling was determined by a DAC and its result matches the one collected by a large volume press, whose isobaric heating was conducted by manually adjusting its load/pressure.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Southern Univ. and A&M College, Baton Rouge, LA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOD; USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Contributing Organization:
Lawrence Berkeley National Laboratory (LBNL). Advanced Light Source (ALS)
Grant/Contract Number:
AC02-05CH11231; NA0003979
OSTI ID:
1865614
Journal Information:
International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 2 Vol. 43; ISSN 0195-928X
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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