Sintering behavior of Ca- or Sr-doped LaCrO3 perovskites including second phase of AECrO4 (AE=Sr, Ca) in air

摘要: Abstract The sintering characteristics and mechanisms of stoichiometric alkaline earth metal (AE)-doped lanthanum chromites, including the second phase AECrO4 with low-melting point in air, (La1−xAExCrO3, AE=Ca Sr, 0≤x≤0.3), have been discussed. When x≤0.2, properties La1−xCaxCrO3 are lower than those La1−xSrxCrO3. However, reverse results were observed at x=0.3. mixtures LaCrO3 showed low properties. It was found that reaction phases started temperatures melting point. Thermal expansion coefficients (TECs) temperature range from 50 to 1000°C 8.6×10−6/°C for LaCrO3, 13.1×10−6/°C CaCrO4, 17.5×10−6/°C SrCrO4. larger TEC among particles disturb during high heat treatment.