采用化学共沉淀-高温煅烧技术制备的具有烧绿石结构的(La0.75Sm0.25)2Zr2O7纳米粉体,其平均晶粒尺寸约为47 nm,其晶体结构为等轴晶系,空间群为F d-3m,晶胞参数a0=1.075 nm.采用高温动态XRD技术研究了(La0.75Sm0.25)2Zr2O7纳米粉体的热稳定性、热膨胀性及抗烧结性能.结果表明:(La0.75Sm0.25)2Zr2O7纳米粉体具有良好的热稳定性,高温下晶体结构仍保持稳定,1 400℃的热膨胀系数为9.7 ×10-6 K-1;具有优异的抗高温烧结性能,1 250℃以上纳米晶粒才开始快速生长,1 400℃时,晶粒尺寸为132 nm.
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