Thermodynamic properties of vanadium silicides. I. Standard molar enthalpy of formation Delta H-f(m)degrees of vanadium disilicide (VSi2) at the temperature 298.15 K
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Watling, K
Hope, GA
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Abstract
The massic energy of combustion of vanadium disilicide in fluorine according to the reaction V Si2(cr) + (13 / 2)F2(g) = V F5(g) + 2SiF4(g) has been measured calorimetrically. On the basis of the derived molar enthalpy of reaction and the standard molar enthalpies of formationΔfHmo of VF5(g) and SiF4(g),ΔfHmo (VSi2, cr, 298.15 K) = − (133.3 ± 2.0)kJ · mol − 1at T = 298.15 K and p = 0.1 MPa. This result is compared with other values ofΔfHmo (VSi2) from the literature. The complete conventional thermodynamic properties of VSi2are also tabulated between the temperatures 298.15 K and 1950 K.
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Journal of Chemical Thermodynamics
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31
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11
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Physical chemistry
Theoretical and computational chemistry