硝酸盐热分解法制备Nd:YAG透明激光陶瓷

以Al(NO₃)₃9H₂O，Y(NO₃)₆H₂O和Nd₂O₃为原料,采用硝酸盐热分解法在1000℃左右合成了单相Nd:YAG陶瓷超细粉体．加入0.5％的正硅酸乙酯作为烧结添加剂后，前驱粉料经1500℃~1700℃真空热压烧结5h得到具有一定透明度的掺钕钇铝石榴石多晶陶瓷．采用X射线衍射仪(XRD)及扫描电子显微镜(SEM)等测试手段对Nd:YAG陶瓷材料进行了测试，结果表明当焙烧温度为1000℃时，前驱粉体可以直接得到YAG立方晶相，没有YAM和YAP等中间相生成，煅烧所得的粉末颗粒细小均匀，呈椭球状，颗粒尺寸为200~250nm，且分散性较好．真空烧结后的陶瓷晶粒尺寸在2~4μm，并且随着烧结温度的提高，Nd:YAG陶瓷的晶粒增大，晶形发育完整，气孔减少，晶粒内部和晶界的化学组成基本相同．所制备的Nd:YAG透明陶瓷在可见光区最大透光率为47％，在红外光区的透光率接近56％．

Preparation of transparent laser ceramics Nd:YAG by the nitrate pyrogenation method

The single phase of Nd:YAG powder were synthesized at 1000℃ by the evaporation of its nitrate solution method using Al(NO₃)₃9H₂O, Y(NO₃)₃6H₂O and Nd₂O₃ as starting materials. With the addition of 0.5％(in mass) tetraethyl orthosilicate as the sintering aid, transparent Nd:YAG ceramics were fabricated by vacuum sintering at 1500℃~1700℃ for 5h. The Nd:YAG transparent ceramics materials were characterized by the XRD and SEM. The results show that the precursor completely transformed to the YAG(Y₃Al₅O₁₂) phase at about 1000℃ without the intermediate phase of YAM and YAP. The dispersive and flowing property of the particle are very good and the grain size of Nd:YAG is in the range of 200~250nm. The SEM of the fracture surface of the sintered body shows that the grain size is about 2~4μm and that the grain increases while the pores decrease with the increase of the sintered temperatures. The chemical composition of Nd:YAG transparent ceramics in the inner grain and at the grain boundary are basically uniform. Its optical transmittance reaches 47％ in the visible light wavelengths, and 56％ in the infrared wavelengths.