Multicomponent complex oxide media – the basics of the functional materials for electronic engineering: the selection of the promising compositions for assessing the ferrohardness

Abstract

Abstract According to the optimal technological regulations, the solid solutions of two four-component systems based on lead titanate-zirconate and alkali metal niobates were prepared: (1-x) Na0.875Li0.125NbO3 – xPbTi0.5Zr0.5O3 (0.05 ≤x < 0.95, Δx = 0.025-0.10) and (1-x) Na0.875K0.125NbO3 – xPbTi0.5Zr0.5O3 (0.0 ≤x ≤1.0, Δx = 0.05-0.10). The electrophysical parameters of the solid solutions of these systems were determined and the degree of their ferrohardness and efficiency was assessed according to the main characteristics: the relative permittivity of the polarized samples, ε33T/ε0, the mechanical quality factor, Q M, the coefficient of electromechanical coupling of the radial vibration mode, Kp, the piezomodule, |d 31|. It was shown that, depending on the chemical composition and the position of the solid solutions on the phase diagram of the systems, they can be characterized by different degrees of the ferrohardness and efficiency, which made it possible to select promising compositions: ferrohard ones – for the converters with high specific power (in step-down piezotransformers, piezoelectric motors, etc.) ); of the medium ferrohardness – for highly sensitive receivers of the ultrasonic vibrations (telemetry sensors, automatic control systems, etc.); ferrosoft materials with high efficiency – in the low-frequency devices (microphones, hydrophones, deflectors of the optical systems, robotics devices, etc.).