LaCrO₃ の熱膨張性と導電性に及ぼす Ti 置換の影響

抄録

Linear thermal expansion and electrical conductivity of titanium substituted LaCrO₃ have been studied as ceramic interconnect materials in high-temperature solid oxide fuel cells. The transition temperature from orthorhombic to rhombohedral symmetry has a tendency to increase with decreasing Ti content in the perovskites. At Ti content ≥0.2, the phase transition was not observed in the temperature range from room temperature to 1273 K. Average linear thermal expansion coefficient of the Ti substituted perovskites increased with increasing Ti content and approaches that of 8 mol%Y₂O₃ stabilized ZrO₂ electrolyte. Electrical conductivity of the lanthanum chromites decreased with increasing Ti content.