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- W4245822443 abstract "We report a first-principles investigation of the thermal equation of state of hexagonal tungsten mono-carbide (WC) within the quasiharmonic approximation. The equilibrium c/a ratio of WC at a given unit cell volume and temperature is obtained through an explicit minimization of the Helmholtz free energy. The predicted isotherms, compressibility, thermal expansivity, shock Hugonoit, heat capacity, Grüneisen parameter, and Debye temperature of WC show excellent agreements with existing experimental measurements. Similar to ReB2, WC simultaneously exhibits both anisotropic linear compressibility and isotropic thermal expansivity. Such an unusual property is found to be the consequence of a complete cancelation of the effects due to free energy anisotropy and lattice anharmonicity. We demonstrate that the Mie–Grüneisen–Debye formalism, widely used for interpreting experimental pressure–volume–temperature data, may not be of sufficient accuracy for WC. By analyzing the electronic density of states and inter-atomic force constants, the nature of chemical bonding in WC is further elucidated in our study." @default.
- W4245822443 created "2022-05-12" @default.
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- W4245822443 date "1971-12-01" @default.
- W4245822443 modified "2023-09-25" @default.
- W4245822443 title "Grüneisen parameters of the lithium halides" @default.
- W4245822443 doi "https://doi.org/10.1016/0038-1098(71)90385-1" @default.
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