Abstract
The sintering characteristics and mechanisms of stoichiometric alkaline earth metal (AE)-doped lanthanum chromites, including the second phase of AECrO 4 with low-melting point in air, (La 1− x AE x CrO 3, AE=Ca and Sr, 0≤ x≤0.3), have been discussed. When x≤0.2, the sintering properties of La 1− x Ca x CrO 3 are lower than those of La 1− x Sr x CrO 3. However, the reverse results were observed at x=0.3. The mixtures of LaCrO 3 and AECrO 4 showed low sintering properties. It was found that the reaction of the second phases with LaCrO 3 started at temperatures lower than the melting point. Thermal expansion coefficients (TECs) in the temperature range from 50 to 1000°C were 8.6×10 −6/°C for LaCrO 3, 13.1×10 −6/°C for CaCrO 4, and 17.5×10 −6/°C for SrCrO 4. The second phases with larger TEC among the LaCrO 3 particles disturb the sintering characteristics of the LaCrO 3 particles during the high temperature heat treatment.
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