Study of the Order‐Disorder Transition in A(B′B″)O3 Perovskite Type Ceramics

Based on an order–disorder transition model and the calculation of coulombic electrostatic interaction of B‐site ions, an “ordering structure factor” F 0 is introduced. Consequently, an available criterion and diagram to predict the order–disorder transition of A(B′B″)O 3 is presented quantitatively. The theoretical results compare satisfactorily with experimental data collected from the literature for different kinds of A(B′B″)O 3 ferroelectrics and antiferroelectrics. Permittivity ɛ′ is a sensitive parameter and plays an important role in order–disorder transition. The reason for conflicting arguments from different references for the ordering of some compounds is discussed.