Perovskite-type Oxids with Low Resistivity and High Stability at High Temperatures in Air

Abstract

The replacement of metal electrodes by conductive oxides is useful in ceramic based products. LaCo_0.5Ni_0.5O_3−δ demonstrates high stability and high electrical conductivity with a small temperature coefficient up to 1173 K in air. The electrical conductivity of 1.9 × 10³ Scm⁻¹ is due to the high carrier concentration of 2.2 × 10²² cm⁻³ and the small effective mass of 0.10 m_e. In addition, the temperature coefficient of the conductivity is smaller than that of standard metals, and little change in oxygen content occurs up to 1173 K in air. We believe that LaCo_0.5Ni_0.5O_3−δ is suitable as a conductive material for electrode and electrical wiring at high temperatures in air.