Frequency dependences of complex constants of lead-free ferroelectric ceramics

Abstract

In this work, the frequency dependences of complex piezoelectric, dielectric, and elastic parameters of lead-free ferroelectric ceramics based on solid solutions of the (Na, Li)NbO₃ system were studied in the frequency range up to 100 MHz. A complete set of complex parameters of lead-free ferroelectric ceramics was measured using the PRAP automatic iterative method. It was shown that the studied lead-free ferroelectric ceramics are characterized by low attenuation of ultrasonic waves and lack of dispersion in a wide frequency range, and can be used in high-frequency ultrasonic transducers for medical and nondestructive testing equipment.

Keywords:

• Lead-free compositions
• alkali metal niobates
• ferroelectric ceramics
• dispersion
• attenuation
• complex parameters
• piezoelectric resonance analysis

Additional information

Funding

This work was financially supported by the Ministry of Education and Science of the Russian Federation (the state task in the field of scientific activity, Southern Federal University), 2020.