SOME CALCULATION METHODS AS A TOOL TO REVISE THERMODYNAMIC DATA FOR THE SRCUO2, SR2CUO3, SR14CU24O41 AND SRCU2O2 DOUBLE OXIDES

Various calculation methods were used to review and revise known exper imental data of thermochemical properties of the Sr-Cu double oxides i n order to estimate the reliable values of Delta H-298(0), S-298(0), ( H298-H00)-H-0, and Delta H of phase transformations as well as C-p (T) and C-p at T>T-ph.tr for the SrCuO2, Sr2CuO3, SrCu24O41 and SrCu2O2 c ompounds. Calorimetry-based experimental data were treated by the meth od called ''Linear Approximation Rule'' which provided satisfactory ag reement. For all double oxides the temperature dependences of reduced Gibbs energy were also calculated in the interval for 298-6000 K. (C) 1998 Elsevier Science B.V.