Atomization energies and enthalpies of formation of the SnBi[sub n] (n=1–3) gaseous molecules by Knudsen cell mass spectrometry

Meloni, G.; Gingerich, K. A.
April 2002
Journal of Chemical Physics;4/22/2002, Vol. 116 Issue 16, p6957
Academic Journal
The equilibria involving the gaseous species SnBi, SnBi[sub 2], and SnBi[sub 3] above the condensed system Bi–Sn contained in a graphite cell have been investigated by the Knudsen effusion technique combined with mass spectrometry. Third law enthalpies for the reactions SnBi[sub n](g)=Sn(cond)+nBi(g), n=1–3, were evaluated. By combining the experimental reaction enthalpies with the appropriate thermodynamic data taken from literature, the following atomization energies, Δ[sub a]H[sub 0][sup o], and enthalpies of formation, Δ[sub f]H[sub 298.15][sup o], in kJ mol-1, have been derived: SnBi, 191.1±12.0 and 317.5±12.0; SnBi[sub 2], 415.2±15.0 and 303.0±15.0; SnBi[sub 3], 603.4±18.0 and 323.0±18.0. © 2002 American Institute of Physics.


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