Influence of synthesis temperatures on the crystalline grain growth and morphology of lanthanum magnesium hexaaluminate
来源期刊：Journal of Rare Earths2017年第12期
论文作者：Junbin Sun Jinshuang Wang Wenzhi Huang Xin Zhou Lifen Li Jianing Jiang Longhui Deng Yunya Niu Shujuan Dong Xueqiang Cao
文章页码：1226 - 1232
摘 要：Lanthanum magnesium hexaaluminate(LaMgAl11O19, LMA) was prepared at different temperatures by solid-state reaction. Phase compositions and crystal morphologies of specimens synthesized at different temperatures were investigated using X-ray diffraction（XRD）, scanning electron microscopy（SEM）. It was observed that the crystalline grain size of LMA was not only dependent on the preparation temperature but also on its powder morphology. In the temperature range of 1300 e1550℃, LMA showed platelet grain and the average crystalline grain size increases with the increase in temperature. At1600℃, if the powder was sintered for two times, the equiaxed grain could be found with the decrease in grain space, resulting in the reduction of the crystalline grain size. Styles of specimens（powder or disk） might have no obvious influence on morphologies and sizes of LMA crystalline grains which were synthesized with the well-dispersed raw material mixtures. The synthesis temperature played a key role in influencing the free space for the formation and growth of crystalline grains.
Junbin Sun1，Jinshuang Wang1，Wenzhi Huang2，Xin Zhou1，Lifen Li1，Jianing Jiang1，Longhui Deng1，Yunya Niu1，Shujuan Dong1，Xueqiang Cao1
1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology2. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology
摘 要：Lanthanum magnesium hexaaluminate(LaMgAl11O19, LMA) was prepared at different temperatures by solid-state reaction. Phase compositions and crystal morphologies of specimens synthesized at different temperatures were investigated using X-ray diffraction（XRD）, scanning electron microscopy（SEM）. It was observed that the crystalline grain size of LMA was not only dependent on the preparation temperature but also on its powder morphology. In the temperature range of 1300 e1550℃, LMA showed platelet grain and the average crystalline grain size increases with the increase in temperature. At1600℃, if the powder was sintered for two times, the equiaxed grain could be found with the decrease in grain space, resulting in the reduction of the crystalline grain size. Styles of specimens（powder or disk） might have no obvious influence on morphologies and sizes of LMA crystalline grains which were synthesized with the well-dispersed raw material mixtures. The synthesis temperature played a key role in influencing the free space for the formation and growth of crystalline grains.
关键词：
