Structural Characteristics and Dielectric Properties of La1-xCoxFeO3 and LaFe1-xCoxO3 Synthesized via Metal Organic Complexes

Abstract

La1.xCoxFeO3 and LaFe1.xCoxO3 perovskite-type oxides with 0.1 < x < 0.3 are prepared by thermal decomposition of the metal organic complexes, using triethanolamine (N(CH2CH2OH)3) as ligand and La(NO3)3.6H2O and Fe(NO3)2.9H2O as starting materials. CoCl2.6H2O is used as the dopant. The obtained products calcined at 850 °C for 2 h were characterized by XRD, FTIR, BET and SEM and their dielectric properties were investigated. It was found that all the as-prepared samples crystallized in orthorhombic structure of LaFeO3 perovskite and exhibit conducting behavior. It suggests that the substituted Co(II) and oxygen deficiency play an important role in the ionic conductivity of these materials.