The PZT system (PbTixZr1–O3, 0≤x≤1.0): The real phase diagram of solid solutions (room temperature) (Part 2)

The sequence of phase transformations in the ceramic system PbTixZr1−xO3 (0≤x≤1.0) is determined and the real phase diagram of solid solutions is built. The observed periodicity of phase formation processes in the rhombohedral and tetragonal regions is explained by the real (defective) structure of PZT system ceramics, which is in many respects related to the variable valence of Ti ions and, as a result, to formation, accumulation, and ordering of point defects (oxygen vacancies) and their elimination by crystallographic shifts. The obtained results are useful in interpretation of the macroscopic properties of ceramics based on the PZT system.