THERMOCHEMICAL PROPERTIES OF MECUO2 AND ME2CUO3 (ME = CA, SR, BA) MIXED OXIDES

Optimized experimental data and estimated values are utilized for the assessment of thermochemical functions of alkali-earth cuprates. For t he determination of temperature dependences of heat capacities the Neu mann-Kopp additive rule was employed, Values of standard enthalpy of f ormation and molar entropy of Ca2CuO3, SrCuO2, Sr2CuO3 and BaCuO2 were optimized from experimental results. For the estimation of enthalpies of formation of CaCuO2 and Ba2CuO3 a linear correlation between entha lpy of formation from oxides and ionic radius of alkali-earth cations was used. Molar entropy of CaCuO2 and Ba2CuO3 was estimated using the modified contribution method. (C) 1998 Elsevier Science B.V.