Dielectric properties and X-ray study of Zr-substituted Pb(Yb1/2Nb1/2)O-3 ceramics

The dielectric behavior and the crystal structure of (1 - x)Pb(Yb1/2Nb1/2)O -3-xPbZrO(3) (PYN(1-x)PZ(x)) (0 less than or equal to x less than or equal to 0.6) solid solution have been investigated. In the PYN-rich composition range (0 less than or equal to x less than or equal to 0.3), the paraelectr ic (PE)-antiferroelectric (AFE) phase transition takes place sharply and is independent of the applied frequency. However, on increasing PZ concentrat ion, the dielectric constant vs. temperature curve becomes gradually broade r and the apparent transition temperature becomes frequency-dependent. For 0.33 less than or equal to x less than or equal to 0.60, the crystal struct ure becomes pseudocubic from the PYN's orthorhombic and a typical relaxer p hase transition is clearly established.