Binary, Ternary and Four-Component Systems Based on Sodium Niobate: Phase Diagrams of States, the Role of the Number of Components and Defectiveness in the Formation of the Properties

摘要

According to the results of the analysis of the solid solutions in the multicomponent systems, based on lead titanate zirconate (PZT), there have been defined the search stages for the new functional materials for various purposes. The role of the number of components in the formation of the electrophysical properties has been shown. It has been defined that the 5-component systems, based on the PZT, provide the optimal combinations of basic electrical parameters. The phase diagrams of the two-, three- and four-component systems, based on sodium niobate, have been considered. The complexity of phase diagrams has been shown, which are distinguished by a large number of structural transitions, and by a variety of phase transformations in comparison with the systems, based on the PZT. It has been defined that in niobate systems, a considerable growth of electrophysical parameters during the transition to the four-component system was observed. The influence of the defectiveness of solid solutions on the formation of their macro-properties has been revealed. It has been defined that in one multicomponent system, the materials with different totality of the parameters can be obtained on the base of the compounds with fundamentally different macro-responses, which will allow using them in the combined equipment complexes, functioning in a sufficiently wide operating frequency range.