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

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