On the Ferroelectric Structural Phase Transitions in Solid Solutions

If the ferroelectric solid solutions are regarded as homogeneous phases between two or more components, then, according to the ferroelectric–paraelectric diagrams, the diffused phase transitions can be explained by the occurrence of at least two coexisting phases in thermal equilibrium: one ferroelectric the other paraelectric within a certain temperature range. The representative F–P diagrams and transition mechanisms for the binary and ternary solid solutions are presented.