The standard molar enthalpies of formation of SrTeO3 and SrTe2O5

Author： Mishra R.   Bharadwaj S.R.   Kerkar A.S.   Dharwadkar S.R.  

Publisher： Academic Press

ISSN： 0021-9614

Source： Journal of Chemical Thermodynamics, Vol.30, Iss.7, 1998-07, pp. : 879-883

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Abstract

The molar enthalpies of solution of SrTeO3, SrTe2O5, TeO2, and SrCO3 in HCl (aq, c=11 mol·dm-3) have been measured by using an isoperibol calorimeter. From these results and other auxiliary data, the standard molar enthalpies of formation ∆fHm°(298.15 K) of SrTeO3(cr) and SrTe2O5(cr) have been calculated to be -(1026.0±10.7) kJ·mol-1 and -(1381.2±12.9) kJ·mol-1, respectively. These values of enthalpies of formation are consistent with the second-law enthalpies of formation derived from their vapour pressures determined in this laboratory by a transpiration technique.

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