Dielectric properties of Ba(Ti1−yYy)O3 ceramics

Abstract

Temperature and frequency dependence of the real (ε′) and imaginary (ε″) parts of the dielectric permittivity of Ba(Ti1−yYy)O3 (0.028⩽y⩽0.258) ceramic samples were studied in the temperature range 12–500 K at 102, 103, and 104, and 105 Hz. The permittivity peaks are rounded and frequency dispersive when y>0.028. The maximum of the rounded peak (εm′) decreases with an increase in the yttrium concentration. The temperature corresponding to the permittivity maximum is linearly shifted to lower temperatures at a rate of 29 K per molar percent of yttrium when y⩽0.122, but it remains constant when y⩾0.122. The solid solubility limit of 0.122 is confirmed. Typical relaxor behavior was observed and characterized with empirical parameters in Ba(Ti1−yYy)O3 solid solutions.