International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The ferro-, antiferroelectric and rotational phase transitions of known binary perovskite structure oxides (ABO3) and fluorites (ABF3) have been considered. Some correlations between their phase transition temperature values, on the one hand, and the interatomic bond А-X (X–O or F) strain values, on the other hand, have been constructed. It has been established that the known perovskite structure binary oxides and fluorites with different phase transition nature, caused of a lot of their composition and structure factors, are conditioned, among another, by the interatomic bond А-X strains in their structure.

The functional parameters of lead magnesium niobate PbMg1/3Nb2/3O3 (PMN) and materials based on it make it possible their use as elements of precision motion devices. Nevertheless, it is necessary to increase the time stability of these parameters. Here, the ceramic (1-x)PMN-xPbTiO3 (PMN-PT) was sintered by the spark plasma sintering method (SPS), which, in contrast to traditional sintering methods, allowed to reduce the sintering time and temperature and to obtain fine-grained ceramics with high and stable piezoelectric parameters. The preparation technology of ferro-piezoceramic material PСR-1 needs to be improved, in particular, it is necessary to increase the density of its ceramics. It is shown that the use of ultrasound as an additional influence on the process of mechanically activating of the initial powders on different equipment affects the density, piezo- and dielectric properties of mechanically activated PСR-1 ceramics and allows increasing its density by 10% and at the same time to low its sintering temperature.