Microstructural features and complex electromechanical parameters of lead-free ferroelectric ceramics

Abstract

An experimental study of the microstructural features and complex electromechanical parameters of lead-free ferroelectric ceramics based on solid solutions of the sodium-lithium niobate system was carried out. The phase distribution, as well as grain and domain structure were studied by piezoresponse force microscopy and scanning electron microscopy. A complete set of complex elastic, dielectric, and piezoelectric parameters of lead-free ferroelectric ceramics Na_0.87Li_0.13Sr_0.01Nb_0.99O₃ + 1 at.% SiO₂ was measured and analyzed using the Piezoelectric Resonance Analysis Program automatic iterative method. The frequency dependences of complex electromechanical parameters of the samples were measured in the frequency range up to 90 MHz.

Keywords:

• Lead-Free ferroelectric ceramics
• alkali metal niobates
• microstructure
• electromechanical parameters
• impedance spectra
• piezoelectric resonance

Acknowledgments

The equipment of Ural Center for Shared Use “Modern Nanotechnology” Ural Federal University (Reg. № 2968) was used.

Additional information

Funding

The study was financially supported by the Ministry of Science and Higher Education of the Russian Federation (scientific project No. 0852-2020-0032 (BAS0110/20-3-08IF) and No. 075-15-2021-677).