Dielectric Properties and Phase Transitions of Ba(Ti1-xSnx)O3 Solid Solution

Abstract

In Ba(Ti_{1- x} Sn _x )O₃ solid solution, for Sn concentration x≤0.1, the permittivity follows the Curie-Weiss law above the Curie point T _c. The increase in the peak value of the permittivity at T _c is due to the change in ferroelectric transition from first order to second order with increasing x. For x>0.1, some deviations from the Curie-Weiss law are observed in a narrow temperature region above T _c. The diffuse phase transition was observed. For x>0.2, the Curie-Weiss law does not hold over a wide temperature range. The dielectric dispersion was observed in the radio-frequency range (10 kHz–10 MHz). With increasing Sn concentration, the change in the phase transition from a normal ferroelectric transition to relaxor through the diffuse phase transition was observed.