Dielectric properties of Aurivillius Bi₅Ti₃Fe_0.5Ni_0.5O₁₅ ceramics

Abstract

A new Aurivillius Bi₅Ti₃Fe_0.5Ni_0.5O₁₅ compound was prepared using the conventional ceramic technology. The features of the temperature dependences of the dielectric constant ε′ and the dielectric loss tgδ were studied in the temperature range from 300 to 750 K. These dependences indicate a significant conductivity contribution to the ε′ and tgδ as well as the presence of a relaxation process. The ac conductivity was calculated, the hodograph of the impedance of the sample was plotted, and the activation energy of the dielectric relaxation process was estimated. A comparison of the activation energy of the total electrical conductivity and electrical conductivity in the grain bulk showed that the electrical conductivity of the studied compound is mainly due to the electrical conductivity of the grains boundaries.

Keywords:

• Aurivillius phase
• relaxation process
• activation energy

Additional information

Funding

This work was supported by the Ministry of Education and Science in the framework of the state assignment (project No. FZGM-2020-0007).