Infrared Emittance and Electrical Properties of Ce⁴⁺ Doped Sm_0.5Sr_0.5CoO₃ Ceramics

Abstract

A series of Sm0.5Sr0.5CoO3-CeO2 ceramics formed by solid state-reaction method have been systematically investigated. The effects of doping the Sm site of Sm0.5Sr0.5CoO3 with Ce4+ on the structural, spectral reflectance, and thermal radiation properties were also explored. The modification of the initial phase takes place can be ascribed to the dissolution of Ce from initial CeO2 into the perovskite structure. The conductivity behavior depends critically on the Ce doping level, as was demonstrated that the recombination of holes (from Sm0.5Sr0.5CoO3) and electrons (from ceria ion) could decrease electrical conductivity. Sm0.5Sr0.5CoO3-CeO2 ceramics showed continuously adjustable conductivity and infrared emittance, opening up possible applications in solar thermal conversion or thermosensitive conductivity.