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 10, 10, and 10, and 10 Hz. The permittivity peaks are rounded and frequency dispersive when y>0.028. The maximum of the rounded peak (ε′m) 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-y Yy)O3 solid solutions. © 1998 American Institute of Physics.