Dielectric Tunability, Dielectric Relaxation, and Impedance Spectroscopic Studies on ( Ba _0.85 Ca _0.15 )( Ti _0.9 Zr _0.1 ) O ₃ Lead‐Free Ceramics

Abstract

Dielectric and impedance spectroscopies were employed to study the electrical behavior of ( Ba 0.85 Ca 0.15 )( Ti 0.9 Zr 0.1 ) O 3 (abbr. BCTZ ) lead‐free ceramic. The dielectric properties versus dc bias electric field experiment revealed high dielectric tunability (> 65%) as well as figure of merit (> 27) at 10 kHz and room temperature. At elevated temperature range, a dielectric loss peak was observed and verified to be correlate of oxygen vacancy relaxation. The impedance spectra studies indicate that the ceramic is a mixed ionic conductor of p ‐type nature at the paraelectric phase and, the grain and total conductivity at 600°C reaches 6.0 × 10 −5 and 2.0 × 10 −5 S/cm, respectively.