X-ray and dielectric studies of Pb(Mg1/2W1/2)O-3 substituted Pb(Yb1/2Nb1/2)O-3 ceramics

Abstract

The crystal structure and dielectric properties of the antiferroelectric solid solution of (1-x)Pb(Yb1/2Nb1/2)O-3-xPb(Mg1/2W1/2)O-3 (PYN1-xPMWx) (0 less than or equal tox less than or equal to0.30) have been studied. The crystal structure is shown to become pseudocubic from the PYN's orthothombic structure with increasing x. In the PYN-rich composition range (0 less than or equal tox <0.28), the paraelectric (PE)-antiferroelectric (AFE) phase transition occurs sharply and is independent of the applied frequency. However, in the higher PMW concentration (x=0.30), the dielectric constant vs. temperature curve becomes gradually broader and the solid solution becomes relaxor. (C) 2001 Published by Elsevier Science Ltd.