以Gd2O3、Al(NO3)3·9H2O和HNO3为原料,柠檬酸为络合剂,通过溶胶凝胶法制备前驱体,经过1000℃,保温2h热处理得到了纯相铝酸钆(GdAlO3)粉体,通过谢乐公式计算,得到各种温度煅烧后粉体的平均晶粒尺寸范围为25～40nm,发现随着煅烧温度的提高,晶粒尺寸逐渐长大；通过研究GdAlO3坯体样品的恒速无压烧结曲线,发现当升温速率为5℃/min时,样品在957℃开始收缩,烧结温度为1600℃时,最大收缩率为16.17％;以烧结曲线为基础,使用基于相对收缩率的Arrhenius关系,计算得到铝酸钆的烧结激活能为22.4kJ/mol,低于氧化铝的烧结激活能,说明其会促进氧化铝的烧结.%Pure phase dysprosium aluminum garnet (GdAIO3) powder synthesized with GdA Al (NO3)3-9H2O and HNO3 as the raw materials and citric as the chelating by the sol-gel method was obtained at 1000°C with a dwell time of 2 hours. On the basis of the Scherrer formula, the average grain size for the powder calcined at different temperatures was calculated to be about 25~40nm. It was found that the average grain size increased with the increasing temperature. The sintering behaviors of GdAIO3 green compacts were studied through the sintering curves, and it was found that the GdAIO3 sample began to shrink at the temperature of 957% or so and the maximum shrinkage was 16.17% at 1600t. Moreover, on the basis of the relative shrinkage, the sintering activation energy for GdAIO3 during the sintering process was cumulated by Arrhenius theory, which was about 22.4 kJ/mol, lower than that of alumina. So it was helpful for the sintering of alumina.
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