Preparation, structure and dielectric studies of solid solutions Pb(Fe_1–xIn_x)_2/3W_1/3O₃

Abstract

New samples of Pb(Fe_1–xIn_x)_2/3W_1/3O₃ solid solutions were synthesized for the first time by the ceramic technology and detail of X-ray and dielectric studies were carried out. It was established that in the concentration region 0 < x < 0.12 the obtained samples are practically single-phase and represent perovskite solid solutions. The temperature and frequency dependences of the dielectric properties of the obtained solid solutions were firstly studied. It was found that the samples exhibit the characteristics of ferroelectrics-relaxor with pronounced maxima of dielectric permeability at T_m = 175–200 K, the position of which is shifted with increasing frequency towards high temperatures. Substitution of Fe for In in the solid solutions lowers the maximum value of dielectric permeability (from ∼4700 at x = 0 to ∼3700 at x = 0.10) without significantly changing its peak position on the temperature scale.

Keywords:

• Perovskite
• lead iron tungstate
• ceramics
• dielectric properties
• relaxor

Acknowledgments

The reported study was funded by Ministry of Education and Science of Russia according to the research project No. 3.1099.2017/PP (Structural, electrophysical and magnetic studies of new metal oxide phases with particular physical properties) and Russian Science Foundation according to the research projects No. 18-03-00245 (structural investigations). The equipment of the Center for Collective Use of Russian Technological University (RTU MIREA) was used in this research.