Thermoelectric properties of La(1-x)MxCoO3 (M=Sr, Ca;x=0, 0.1) ceramics for thermal sensors

Abstract

We have investigated the effects of dopant on the thermoelectric properties that La(1-x)MxCoO3 (M=Sr, Ca;x=0, 0.1) bulk ceramics fabricated by the conventional solid state reaction method. The Seebeck coefficient of La(1-x)MxCoO3 (M=Sr, Ca ; x=0, 0.1) bulk ceramics was measured at wide temperature range from 300 K to 673 K. The thermoelectric properties(Seebeck coefficient and electrical resistivity) depend strongly on the kinds of dopants. Sr and Ca dopant decrease the Seebeck coefficient. Density of sintered La0.9Sr0.1CoO3 ceramic at 1523 K was 7.12 g/㎠ and Seebeck coefficient was 35 μV/K at 663 K. However, the electrical resistivity of the Sr doped sample was low and stable.