Journal of Chemical Thermodynamics p. 727 - 734 (1986)
Update date:2022-08-16
Topics:
Mallika, C.
Sreedharan, O. M.
The thermodynamic stabilities of TeO2(s) and Sb2Te3(s) were determined by the solid-electrolyte technique using the following galvanic cells in the temperature ranges 588 to 722 K and 726 to 898 K for TeO2(s) and 645 to 712 K for Sb2Te3(s): Pt/C/Te(s)/TeO2(s)/YSZ/air
0>/Pt, (I); Pt/C/Te(l)/TeO2(s)/YSZ/air
0>/Pt, (II); Pt/C/Sb2Te3(s)/Te(s)/Sb2O3(s)/YSZ/air
0>/Pt, (III); where p0 = 101325 Pa and YSZ denotes 15 mass per cent of Y2O3 stabilizing ZrO2.The standard molar Gibbs energies of formation calculated from the above cells are: ΔfG0m(TeO2,s)/(kJ/mol) = -(323.28 - 0.17600 T/K) +/- 1.21, (588 to 722 K); ΔfG0m(TeO2,s)/(kJ/mol) = -(339.31 - 0.19861 T/K) +/- 0.60, (726 to 898 K); ΔfG0m(Sb2Te3,s)/(kJ/mol) = -(91.57 - 0.04339 T/K) +/- 1.20, (645 to 712 K).From these results, values of -(321.11 +/- 1.29) kJ/mol, 71.51 J/K*mol, and 16.0 kJ/mol were computed for ΔfH0m(TeO2, s, 298.15 K), S0m(TeO2, s, 298.15 K), and ΔfusH0m(Te, s), respectively, and were compared with literature values.
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