TY - JOUR
T1 - Pressure-volume-temperature equation of state of tungsten carbide to 32 GPa and 1673 K
AU - Litasov, Konstantin D.
AU - Shatskiy, Anton
AU - Fei, Yingwei
AU - Suzuki, Akio
AU - Otani, Eiji
AU - Funakoshi, Kenichi
N1 - Funding Information:
We thank the reviewers for thorough reviews and suggestions and Chris Seagle for helpful comments. This work was conducted as a part of the Global Center-of-Excellence Program “Global Education and research Center for Earth and Planetary dynamics” at Tohoku University and partly supported by NSF Geophysics Program (Grant No. EAR-0809539 to Y.F.) and Grants in Aid from Japan Society for Promotion of Science (Scientific Research C No 22540486 to K.L., Scientific Research A No 21684032 to A. Suzuki, and Specially Promoted Research No 22000002 to E.O.).
PY - 2010/9/1
Y1 - 2010/9/1
N2 - We have obtained pressure-volume-temperature (P-V-T) equation of state for hexagonal tungsten carbide (α-WC) up to 32 GPa and 1673 K using synchrotron x-ray diffraction in a multianvil apparatus at the SPring-8 facility. MgO and Au were used as pressure calibrants. A least-squares fit of the P-V-T -data to a high-temperature Birch-Murnaghan equation of state yielded V0 =20.750±0.002 Å3, KT =384±4 GPa, K′ =4.65±0.32, temperature derivative of the bulk modulus ( KT /T) P =-0.014±0.002 GPa/K, and thermal expansion α= a0 + a1 T with a0 =0.96 (±0.05) × 10-5 K-1 and a1 =0.48 (±0.05) × 10-8 K-2. The data showed an anisotropic nature of compressibility, with the a -axis (K Ta =341±6 GPa) more compressible than the c -the axis (K Tc =506±12 GPa) as well as an anisotropic temperature dependence of K T. The estimated thermal Grüneisen parameters are 1.44-1.64 and the Debye temperature is calculated to be 1220 K, which is different from previous estimates.
AB - We have obtained pressure-volume-temperature (P-V-T) equation of state for hexagonal tungsten carbide (α-WC) up to 32 GPa and 1673 K using synchrotron x-ray diffraction in a multianvil apparatus at the SPring-8 facility. MgO and Au were used as pressure calibrants. A least-squares fit of the P-V-T -data to a high-temperature Birch-Murnaghan equation of state yielded V0 =20.750±0.002 Å3, KT =384±4 GPa, K′ =4.65±0.32, temperature derivative of the bulk modulus ( KT /T) P =-0.014±0.002 GPa/K, and thermal expansion α= a0 + a1 T with a0 =0.96 (±0.05) × 10-5 K-1 and a1 =0.48 (±0.05) × 10-8 K-2. The data showed an anisotropic nature of compressibility, with the a -axis (K Ta =341±6 GPa) more compressible than the c -the axis (K Tc =506±12 GPa) as well as an anisotropic temperature dependence of K T. The estimated thermal Grüneisen parameters are 1.44-1.64 and the Debye temperature is calculated to be 1220 K, which is different from previous estimates.
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U2 - 10.1063/1.3481667
DO - 10.1063/1.3481667
M3 - Article
AN - SCOPUS:77956793441
SN - 0021-8979
VL - 108
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 5
M1 - 053513
ER -