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Molar atomization enthalpies and molar enthalpies of formation of GeSi, GeSi2, Ge2Si, and Ge2Si2by Knudsen-effusion mass spectrometry

✍ Scribed by R. Viswanathan; R.W. Schmude Jr.; K.A. Gingerich

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
360 KB
Volume
27
Category
Article
ISSN
0021-9614

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✦ Synopsis

The partial pressures of Ge(g), Si(g), Si2(g), Ge2(g), GeSi(g), GeSi2(g), Ge2Si(g), and Ge2Si2(g) were measured over a (germanium + silicon + silicon nitride + silver) condensed-phase mixture in the temperature range 1583 K to 1869 K by Knudsen-effusion mass spectrometry. The thermal functions for the Gex Siy gaseous species were calculated, and the atomization equilibria: Gex Siy(g)=xGe(g)+ySi(g), were evaluated. The values of DatomH°m(T : 0)/(kJ•mol -1 ), where DatomH°m denotes the standard molar atomization enthalpy, are (292.728.6) for GeSi(g), (700.4216.8) for GeSi2(g), (665.3216.7) for Ge2Si(g), and (1109.9224.6) for Ge2Si2(g). These values, in combination with the standard molar enthalpies of formation DfH°m of Ge(g) and Si(g), yielded the values DfH°m(T : 0)/(kJ•mol -1 ): (530.329.8) for GeSi(g), (573.9218.9) for GeSi2(g), (529.4217.7) for Ge2Si(g), and (536.1226.3) for Ge2Si2(g).

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