关键词: 铬酸镧, 溶胶-凝胶, 稀土, 烧结

Abstract: La_1-x Sr_xCrO₃ powders were synthesized by a sol-gel method and sintered at a low temperature. The powders and sintered pellets were characterized by XRD, TEM, DSC and SEM. It is found that the mean particle size is below 50nm. The powder with x=0 and 0.1 of single phase of La_1-x Sr_xCrO₃, and another phase SrCrO₄ appears with x=0.3. Lattice distorts and lattice parameters of lanthanum chromite decrease with increasing Sr content. The sintering process of lanthanum chromite can be divided into two stages: a slow exothermic effect below 1200℃ and a quick exothermic effect near 1350℃, corresponding to the primary and intermediate sintering stage, respectively. The relative density of the sintered body (x=0.3) after sintering at 1380℃ is 91％, according to the procedure derived from the DSC analysis.

Key words: lanthanum chromite, sol-gel, rare-earth, sintering