摘要
采用均相沉淀法,以Al(NO3)3.9H2O、Y2O3、Nd2O3、(NH4)2SO4和NH4HCO3为原料,正硅酸乙酯为添加剂,制备Nd∶YAG纳米粉末;并探讨了均相沉淀法制备Nd∶YAG纳米粉末的反应机理。研究结果表明,粉体在800℃时为无定型态,当温度达到900℃时析出大量YAlO3(YAP)和少量Y3Al5O12(YAG)晶体,当温度达到1000℃时就全部转化为YAG立方晶相;混合溶液生成沉淀物是由Al 3+的沉淀所决定的;Al 3+首先均相成核,随后Y3+和Nd3+以Al沉淀物为异相核发生异相成核,形成的沉淀物覆着于Al沉淀物表面,推测沉淀物结构可能为钇包覆铝的核壳结构。
The Nd ： YAG nanometer powders were fabricated by the homogeneous coprecipitation method, usingNd203, Y203, Al（NO3）3 · 9H20 and NH4HCO3 as raw materials, TEOS as sintering additive. Reac- tion mechanism of the homogeneous precipitation method for the preparation of Nd ： YAG nanometer powder was discussed. The results show that powders are amorphous at 800℃, the large amount YA103 （YAP） and ti ny amout Y3Al5O12 （YAG） appear when the calcination temperature is 890℃ and the YAP hexagonal crystal phase transform to YAG cubic crystal phase at 1000℃ ; the mixed solution is composed of AP＋ precipitate pre- cipitate decision; AP3＋ first homogeneous nucleation, then y3＋ and Nd3＋ occurs heterogeneous nucleation, the precipitate formed covered in A1 precipitate on the surface. The precipitate structure is presumably yttrium coa- ted aluminum core-shell structure.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2013年第12期1821-1824,共4页
Journal of Functional Materials
基金
国家高技术研究发展计划(863计划)资助项目(2011AA030204)
教育部科学技术重点研究资助项目(205037)
关键词
均相沉淀法
掺钕钇铝石榴石
均相成核
纳米粉末
homogeneous coprecipitation method
neodymium doped-yttrium aluminum garnet
homogeneous nucle-ation
nanometer powders
