Thermodynamic Regularities in Perovskite and K2NiF4 Compounds

Harumi Yokokawa, Tatsuya Kawada, Masayuki Dokiya

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85 Citations (Scopus)


It has been found that the enthalpy of formation of perovskite compounds, ΔfH° (ABO3, B = transition metais), from binary oxides can be well characterized in terms the tolerance factor, t≡(rA+ ro)√2 (rB+ ro), where rA and rB are the radii of A‐site ions with 12‐coordination and B‐site ions with 6‐coordination, respectively, and ΔfH°=−168 + 270(1 − t) kJ·mol−1 for AIBVO3, ΔfH°=−125 + 1000(1 − t) kJ·mol−1 for AIIBIVO3, and ΔfH°=− 90 + 720(1 − t) kJ·mol−1 for AIIIBIIIO3. Although the thermodynamic data of K2NiF4 compounds are not extensive, a similar regularity can be found when use is made of the radii of A‐site ions with 9‐coordination for the K2NiF4 compounds. These correlations will be quite useful in predicting.

Original languageEnglish
Pages (from-to)152-153
Number of pages2
JournalJournal of the American Ceramic Society
Issue number1
Publication statusPublished - 1989 Jan


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