Инд. авторы:	Litasov K.D., Gavryushkin P.N., Dorogokupets P.I., Sharygin I.S., Shatskiy A., Fei Y.W., Rashchenko S.V., Seryotkin Y.V., Higo Y., Funakoshi K., Ohtani E.
Заглавие:	Thermal equation of state to 33.5 Pa and 1673 K and thermodynamic properties of tungsten
Библ. ссылка:	Litasov K.D., Gavryushkin P.N., Dorogokupets P.I., Sharygin I.S., Shatskiy A., Fei Y.W., Rashchenko S.V., Seryotkin Y.V., Higo Y., Funakoshi K., Ohtani E. Thermal equation of state to 33.5 Pa and 1673 K and thermodynamic properties of tungsten // Journal of Applied Physics. - 2013. - Vol.113. - Iss. 13. - Art.133505. - ISSN 0021-8979. - EISSN 1089-7550.
Внешние системы:	DOI: 10.1063/1.4799018; РИНЦ: 20445692; SCOPUS: 2-s2.0-84880663091; WoS: 000317238000011;
Реферат:	eng: A comprehensive P-V-T dataset for bcc-tungsten was obtained for pressures up to 33.5GPa and temperatures 300-1673 K using MgO and Au pressure scales. The thermodynamic analysis of these data was performed using high-temperature (HT) and Mie-Gruneisen-Debye (MGD) relations combined with the Vinet equations of state (EOS) for room-temperature isotherm and the newly proposed Kunc-Einstein (KE) EOS. The KE EOS allowed calibration of W thermodynamic parameters to the pressures of at least 300GPa and temperatures up to 4000 K with minor uncertainties (<1% in calculated volume of W). A detailed analysis of room-temperature compression data with Vinet EOS yields V-0 = 31.71 +/- 0.02 angstrom(3), K-T = 308 +/- 1 GPa, and K-T = 0 4.20 +/- 0.05. Estimated thermoelastic parameters for HT include (partial derivative K-T/partial derivative T)(P) = -0.018 +/- 0.001 GPa/K and thermal expansion alpha = a(0) + a(1)T with a(0) = 1.35 (+/- 0.04) x 10(-5) K-1 and a(1) =0.21 (+/- 0.05) x 10(-8) K-2. Fitting to the MGD relation yielded c0 1.8160.02 and q = 0.71 +/- 0.02 with the Debye temperature (theta(0),) fixed at 370-405 K. The parameters for KE EOS include two Einstein temperatures, Theta(E1o) = 314 K and Theta(E2o) = 168 K, Gruneisen parameter at ambient condition c0 1.67 and infinite compression c1 0.66, with beta = 1.16 (which is a power-mode parameter in the Gruneisen equation), anharmonicity (m = 3.57) and electronic (g = 0.11) equivalents of the Gr_ uneisen parameter, and additional parameters for intrinsic anharmonicity, a(0) = 6.2 x 10(-5) K-1, and electronic contribution, e(0) = 4.04 x 10(-5) K-1 to the free energy. Fixed parameters include k = 2 in KE EOS and m(E1) = m(E2) = 1.5 in expression for Einstein temperature. Present analysis should represent the best fit of the experimental data for W and can be used for a variety of thermodynamic calculations for W and W-containing systems including phase diagrams, chemical reactions, and electronic structure. (C)2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4799018]
Ключевые слова:	SOLIDS; TA; MGO; MO; EXPANSION; POLYCRYSTALLINE TUNGSTEN; ELASTIC PROPERTIES; HIGH-PRESSURE; SHOCK COMPRESSION; MOLYBDENUM;
Издано:	2013
Физ. характеристика:	133505