Fluorine-combustion calorimetric determinations of the standard molar enthalpy changes for the formation of SiSe2(cr), SiSe1.94(cr), and SiSe1.94(vit), and for the transition: SiSe1.94(vit) = SiSe1.94(cr) at the temperature T = 298.15 K. Implications of the results for the enthalpies of dissociation Dom(Se—SiSe) and Dom(SiSe). Thermodynamic properties of SiSe(g)

✍ Scribed by Iwona Tomaszkiewicz; S. Susman; K.J. Volin; P.A.G. O'Hare

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 468 KB
• Volume: 26
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.1994.1126

✦ Synopsis

Fluorine-bomb calorimetry was used to determine the standard massic energies of combustion (\Delta_{\mathrm{c}} u^{\nu}) of the silicon selenides (\mathrm{SiSe}{2}(\mathrm{cr}), \mathrm{SiSe}{1.94}(\mathrm{cr})), and (\mathrm{SiSe}{1.94}(\mathrm{vit})), according to the combustion reaction: (\mathrm{SiSe}{v}(\mathrm{~s})+(2+3 v) \mathrm{F}{2}(\mathrm{~g})=\mathrm{SiF}{4}(\mathrm{~g})+v \mathrm{SeF}{6}(\mathrm{~g})). The following additional results were derived for the standard molar energy of combustion (\Delta{\mathrm{c}} U_{\mathrm{m}}^{\circ}); the standard molar enthalpy of combustion (\Delta_{\mathrm{c}} H_{\mathrm{m}}^{\circ}); and the standard molar enthalpy of formation (\Delta_{\mathrm{f}} H_{\mathrm{m}}^{\circ}), all at the temperature (T=298.15 \mathrm{~K}) and for the standard pressure (p^{\circ}=101.325 \mathrm{kPa}) :