Abstract
Delafossites CuY 1− x Ca x O 2 (0 ≤ x ≤0.10) ceramics have been prepared by solid state reaction using Cu 2O, Y 2O 3 and CaCO 3. Liquid phase sintering, which obviously accelerates the reaction speed of Cu 2O–Y 2O 3–CaCO 3 system and promotes the formation of CuYO 2 phase is evidenced for the Ca-doped samples. During the sintering process, CuO can react with CaO to form two intermediate compounds, CaCu 2O 3 and Ca 2CuO 3, which decompose into CaO and liquid phase during 1273–1323 K. In the dopant range of 0 ≤ x ≤0.10, both electrical conductivity and density of the samples are increased by Ca-doping. The room temperature conductivity of CuY 0.94Ca 0.06O 2 is more than four orders of magnitude higher than that of CuYO 2.
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