ENERGETICS OF COMPOUNDS (A2 + B4 + O 3) WITH THE PEROVSKITE STRUCTURE.

Article abstract of DOI:10.1016/0022-4596(88)90028-X

The heats of formation from oxides for perovskite compounds, ABO//3(A equals Ca,Sr,Ba,Pb,Cd,B equals Ti,Zr), were determined by high-temperature solution calorimetry using an alkali borate solvent. The values obtained agree with the results of earlier HF solution calorimetry, when available. The heat of formation from the oxides generally becomes more negative the closer the tolerance factor for that perovskite is to unity. The heat of formation can be divided into two contributions, that from changes in electrostatic (Madelung) energy, which becomes more negative as the tolerance factor decreases mainly repulsive interactions.