Fabrication of Yttrium Aluminum Garnet (Y3Al5O12) Nanometer Powder by Citrate-Gel Combustion Method
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摘要: 透明YAG多晶陶瓷具有优良的光学、力学与化学性能，逐渐成为新一代固体激光基质材料。分散均匀、团聚轻的纳米粉体有利于制备出高度透明的激光陶瓷。以Y2O3、Al （NO3）3·9H2O和柠檬酸为原料，采用柠檬酸凝胶燃烧法制备出黑色粉体，经1100℃烧结出尺寸小于50nm的YAG粉体。采用TG-DTA、XRD、FT-IR和TEM测试手段对YAG纳米粉体进行表征，采用谢莱公式计算出不同烧结温度下的晶粒尺寸。研究结果表明：YAG的析晶温度范围为850~900℃，烧结过程中出现赝YAG相物质，1050℃转变成纯YAG相，随着热处理温度的升高，晶粒呈线性增长，纳米粉体的TEM尺寸和采用谢莱公式计算的结果相一致。Abstract: Transparent polycrystalline yttrium aluminum garnet (Y3Al5O12),for its predominant optical,mechanical and chemical properties,is becoming a new generation of solid-state laser matrix material.The homogeneously dispersed,less agglomerated and superfine nanometer precursor powders are greatly favorable to fabricate highly transparent laser ceramics.The black powders are synthesized by using citrate-gel combustion method with Y2O3,Al(NO3)3·9H2O and citric acid as raw materials,and the ytterium aluminum garnet (YAG) precursor powder with a size less than50nm is manufactured by calcining the black powders at temperature1100℃.The YAG precursor powders are characterized by means of XRD,FT-IR and TEM and the grain sizes are calculated by the Scherrer's formula.It is exhibited that the forming temperature of YAG crystal phase is between 850~900℃,the pseudo-YAG crystalline appears during the calcination and then transforms to pure YAG at temperature 1050℃,the grain sizes linearly ascend with the calcination temperature increasing,the particle size observed under TEM is conformable to that calculated by Scherrer's formula.
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Keywords:
- Citrate-Gel method /
- Yttrium aluminum garnet /
- Nanometer powder
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