Relaxation processes in sodium–lithium niobate porous ceramics

Abstract

In our work, we obtained and studied the samples of porous piezoelectric ceramics based on lithium – sodium niobate (LNN) with a pore content of 10, 20, 30, and 40 volume percent. An analysis of the structure, temperature and frequency dependences of the permittivity of the samples was carried out. It was shown that in all samples there are two main relaxation processes: in the regions of high (1 − 7 MHz) and low (10 Hz − 1 MHz) frequencies. The frequency at which a change in the type of dispersion occurs depends on the pores concentration in the sample.

Keywords:

• Porous piezoceramics
• relaxation processes
• nanostructure
• dielectric constant

Additional information

Funding

The work was done on the equipment of the center for collective use of the Tver State University with the financial support of the Ministry of Science and Higher Education of the Russian Federation.