Electrical properties of ceramic samples of (1–x)Ba(Ti1–yZry)O3 ∙ xPbTiO3 solid solutions

Resumo

We have prepared ceramic samples of (1–x)Ba(Ti_1–yZr_y)O₃ ∙ xPbTiO₃, (у = 0–0.10, x = 0–0.67) ferroelectric perovskite solid solutions and characterized them by X-ray diffraction and dielectric and pyroelectric measurements. The composition dependences of the unit-cell parameters for the solid solutions have been obtained; their Curie temperature T_C, relative dielectric permittivity ε, and loss tangent tan δ have been measured at temperatures from 100 to 700 K and frequencies from 25 Hz to 1 MHz; and characteristics of their dielectric hysteresis loops and pyroelectric effect have been assessed. With increasing PbTiO₃ content, the T_C of the samples increases from 400 (x = 0) to 670 K (x = 0.67), the temperatures of their low-temperature phase transitions decrease (to the point that they disappear for x > 0.15), and ε(T = 296 K) decreases at x > 0.1.