中文摘要：

采用水溶液沉淀法成功制备了晶粒尺寸约为16．7nm的纳米LaF3粉体。采用真空（10^-4Pa）压结法（1GPa）制成纳米LaF3块体。用XRD分析测试了不同退火温度下纳米LaF3块体的晶粒尺寸。结果表明，随着退火温度的升高，纳米LaF3块体的晶粒尺寸增大，从原始晶粒尺寸16．7nm长大到900℃时的92．6nm。同时在不同升温速率下测量纳米LaF3块体的DSC曲线，并由Kissinger方程求得其晶粒长大激活能为2．01eV。

英文摘要：

Nanocrystalline powder of LaF3 with an average grain size of 16.7 nm was synthesized by a method of direct precipitation from water solution. Nano-LaF3 bulk material was prepared by compacting the powder to 1 GPa at room temperature and a vacuum of 10^-4Pa. The grain size of the nano-LaF3 bulk material annealed at various temperatures was measured by X-ray diffraction. The results indicated a grain size increase from 16.7 nm to 92.6 nm when the annealing temperature rose to 900 ℃. The DSC curves ofnano-LaF3 bulk material were measured at heating rates of 5 K / min, 1 0 K / rain, 1 5 K / min and 20 K / min, respectively. According to the Kissinger equation, the activation energy for grain growth ofnano-LaF3 bulk material was calculated to be 2.01 eV or 233 kJ / mol.