Effects of Modifying with Simple (MnO_2, CuO) and Combined (MnO_2 + NiO, Bi_2O_3 + Fe_2O_3) Dopants of Multi-Element Media Based on Alkali Niobates

摘要

The features of the crystal structure, grain structure, dielectric, piezoelectric, ferroelastic characteristics of media based on sodium-potassium niobates and modified simple and combined oxides of various elements were studied. It was established that the solid solutions studied were inhomogeneous and actually consist of several low-symmetry phases with close cell parameters. It was shown that in the behavior of macroparameters, a difference was observed in various ways of introducing additives. Regularities in the formation of correlation relationships was established for electrophysical properties presenting the areas of application of the solid solutions under analysis, taking into account their crystallochemical specifics and thermodynamic background. The developed materials are promising for applications in devices operating in power modes (piezotransformers, piezomotors, high- voltage generators). The manifestation of the ferrosoft properties of solid solutions with the introduction of MnO_2 can also be useful for use in low-frequency receiving devices (hydrophones, microphones, seismic receivers).