ZHANG Zhan , CHEN Sha'ou , SHAO Weiquan , WEI Miao , Li Da , WANG Feng

(College of Physics Science, Qingdao University, Qingdao Shandong 266071, China)

Abstract: Pure phase dysprosium aluminum garnet (GdAlO₃) powder synthesized with Gd₂O₃ 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 GdAlO₃ green compacts were studied through the sintering curves, and it was found that the GdAlO₃ sample began to shrink at the temperature of 957℃ or so and the maximum shrinkage was 16.17% at 1600℃. Moreover, on the basis of the relative shrinkage, the sintering activation energy forGdAlO₃ 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.

Key words: sintering behavior; sintering activation energy; GdAlO₃; sol-gel