Thermal equation of state of rhodium to 191 GPa and 2700 K using double-sided flash laser heating in a diamond anvil cell

J. D. McHardy; C. V. Storm; M. J. Duff; C. M. Lonsdale; G. A. Woolman; M. I. McMahon; N. Giordano; S. G. MacLeod

doi:10.1103/physrevb.109.094113

journal article Open Access Mar 21, 2024

Thermal equation of state of rhodium to 191 GPa and 2700 K using double-sided flash laser heating in a diamond anvil cell

J. D. McHardy

C. V. Storm

M. J. Duff C. M. Lonsdale

Physical Review B Vol. 109 No. 9 · American Physical Society (APS)

View at Publisher Save 10.1103/physrevb.109.094113

Abstract

The phase behavior of rhodium (Rh) metal has been studied to 191 GPa and 2700 K using a combination of room-temperature isothermal compression and double-sided flash laser heating experiments. The isothermal compression data have been fitted with a second-order adapted polynomial of order L equation of state (EoS) with best-fitting parameters of V0=13.764(2)Å3/atom, K0=258(3)GPa, and K′=5.36(9). Two-dimensional maps of the uniaxial stress component t are presented for Rh at different pressures showing the spatial distribution of the local stress state of a relatively high-yield strength material encased in a Bi pressure medium. In addition, a simple, thermal pressure equation-of-state model, based on a single Einstein temperature, has been fitted to the high-pressure-temperature data up to 2700 K at 148 GPa and ambient-pressure thermal expansion data up to 1982 K. Also determined are the best-fitting parameters to reproduce the thermal EoS within the two-dimensional integration software. The optimized parameters are V0=13.764Å3/atom, K0=260.54GPa, K′=5.114, αT=2.99×10−5 K−1, ∂αT/∂T=1.27×10−9 K−2, ∂K0/∂T=−6.43×10−5GPa/K, and ∂K′/∂T=−9.3×10−10K−1.

Published by the American Physical Society
2024

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Published: Mar 21, 2024
Vol/Issue: 109(9)
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J. D. McHardy