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| Journal Article | PUBDB-2024-01090 |
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2024
Wiley-VCH Verl.
Weinheim
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Please use a persistent id in citations: doi:10.1002/cphc.202300604 doi:10.3204/PUBDB-2024-01090
Abstract: We have performed in situ X-ray diffraction measurements of cubic silicon carbide (SiC) with a zinc-blende crystal structure (B3) at high pressures and temperatures using multi-anvil apparatus. The ambient volume inferred from the compression curves is smaller than that of the starting material. Using the 3$^{rd}$-order Birch-Murnaghan equation of state and the Mie-Grüneisen-Debye model, we have determined the thermoelastic parameters of the B3-SiC to be K$_0$=228±3 GPa, K$_0$’,=4.4±0.4, q=0.27±0.37, where K$_0$, K$_0$’ and q are the isothermal bulk modulus, its pressure derivative and logarithmic volume dependence of the Grüneisen parameter, respectively. Using the 3rd-order Birch-Murnaghan EOS with the thermal expansion coefficient, the thermoelastic parameters have been found as K$_0$=221±3 GPa, K$_0$’,=5.2±0.4, α$_0$=0.90±0.02 ⋅ 10$^{−5}$ ⋅ K$^{−1}$, where α$_0$ is the thermal expansion coefficient at room pressure and temperature. We have determined that paired B3-SiC – MgO calibrants can be used to estimate pressure and temperature simultaneously in ultrahigh-pressure experiments up to 60 GPa.
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