X-ray and dielectric studies of Pb(Mg12W12)O3 substituted Pb(Yb12Nb12)O3 ceramics

The crystal structure and dielectric properties of the antiferroelectric solid solution of (1–x)Pb(Yb12Nb12)O3–xPb(Mg12W12)O3 (PYN1–xPMWx) (0⩽x⩽0.30) have been studied. The crystal structure is shown to become pseudocubic from the PYNʹs orthothombic structure with increasing x. In the PYN-rich composition range (0⩽x<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.