Abstract
The impurity-induced ferroelectric phase transitions in incipient perovskite ferroelectrics are discussed along with improper ferroelastic phase transitions. It is shown that the critical concentration of impurities is proportional to 1/ϵ3/2 and that the ferroelectric phase transitions probably suppress ferroelastic transitions.
This work was partially supported by the Russion Ministry of Industry, Science and Technology (grant Sc.Sc. 2168.2003.2).