Preparation and characterization of lanthanum lead cobalt titanium oxide, La1-xPbxCo1-xTixO3 (0 < x < 1)

Abstract

Attempts have been made to prepare the solid-solution La1-xPbxCo1-xO3 for 0 < x < 1. X-ray diffraction indicates the formation of single-phase materials over the entire range. Compositions with 0 < x ≤ 0.20 are rhombohedral, those with x in the range 0.2 to 0.8 are cubic, and those with x ≥ 0.9 are tetragonal. Chemical analysis shows that all these samples are lead deficient. This is due to volatilization of PbO during preparation. Conduction is mainly due to 3d electrons of cobalt ions. All the samples except x = 0.05 show p-type conduction at and above 300 K. Samples with x ≥ 0.5 exhibit dielectric anomaly at a particular temperature which increases with increasing x. © 1987.