镝铝石榴石(DAG)粉体的溶胶凝胶法制备工艺研究

INVESTIGATION OF THE SOL-GEL PREPARATION PROCEDURE FOR DAG POWDER

以Dy2O3、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了纯相镝铝石榴石（DAG）纳米粉体,采用XRD和SEM手段对DAG粉体进行了表征。结果表明：纯相的DAG粉体在900℃、保温2h形成,在1200℃完全晶化。通过谢乐公式计算,得到经各种温度处理后粉体的平均晶粒尺寸范围为30-50nm。对比烧结温度和保温时间对粉体粒度的影响,发现在粉体晶化完全前,延长保温时间对晶粒尺寸的影响比升高烧结温度要大;在粉体完全晶化后,烧结温度的提高比保温时间的延长更能影响晶粒尺寸。

Pure phase dysprosium aluminum garnet（DAG） powder synthesized with Dy2O3 Al（NO3）3.9H2O and HNO3 as the raw materials and citric acid as the chelating agent by the sol-gel method was characterized by XRD and SEM.The results indicated that the pure-phase DAG powder was obtained at 900 ℃ with a dwell time of 2 hours,and the complete crystallization temperature was 1200℃.On the basis of the Scherrer formula,the average grain size for the powder calcined at different temperatures was calculated to be about 30-50nm.Comparing the influence of the holding time and the calcined temperature on the DAG grain size,it was found that the holding time played a more important role than the calcined temperature on the grain size before the complete crystallization,while,when complete crystallization finished,the influence of the former on the grain size was more than the latter.