Structural Characteristics and Dielectric Properties of La_(1-x)Co_xFeO_3 and LaFe_(1-x)Co_xO_3 Synthesized via Metal Organic Complexes

摘要

La_(1-x)Co_xFeO_3 and LaFe_(1-x)Co_xO_3 perovskite-type oxides with 0.1≤x≤0.3 are prepared by thermal decomposition of the metal organic complexes, using triethanolamine (N(CH_2CH_2OH)_3) as ligand and La(NO_3)_3·6H_2O and Fe(NO_3)_2·9H_2O as starting materials. CoCl_2·6H_2O 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 LaFeO_3 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.