Phase evolution in SrTiO3-PbZrO3 solid solution

The article is focused on the compositional evolution and interrelation of phases in (1−x)SrTiO3-xPbZrO3 solid solution. The results of dielectric and ultrasonic wave velocity measurements in a temperature range from 4.2 to 600 K are reported. Experimental evidences of a ferroelectric phase transition at the critical concentration xc1=0.0028, the transformation from the ferroelectric to relaxor ferroelectric state at 0.08≤x 0.6 are obtained. It was also shown that antiferrodistortive (improper ferroelastic) phase exists up to the concentrations 0.08antiferroelectric (the second antiferrodistortive) phase transition is suppressed also in the relaxor region at x<0.7. The experimental phase diagram and interrelations between the phases in the system are analyzed within the phenomenological Lifshits model.