【摘要】 掺钕钇铝石榴石(Nd∶YAG)多晶透明陶瓷具有良好的化学稳定性、光学性能和耐高温性能,是一种很有前途的激光工作物质。以Al(NO3).9H2O,Y2O3,Nd2O3和NH4HCO3为原料,(NH4)2SO4为静电稳定剂,正硅酸乙酯为添加剂,采用共沉淀法和反滴定方式于1100℃合成出分散均匀、团聚程度轻、YAG立方晶相的Nd∶YAG纳米前驱体粉末,经1700℃真空烧结5 h制备出Nd∶YAG透明陶瓷材料。采用TG-DTA,XRD,TEM,FT-PL和FEG-ESEM等测试手段对Nd∶YAG陶瓷材料进行了表征。研究结果表明:前驱体粉末在800℃时为无定型态,当温度达到890℃时析出大量的YAlO3(YAP)和少量的Y3Al5O12(YAG)晶体,当温度达到1012℃时就全部转化为YAG立方晶相;前驱体纳米粉末中存在团聚。Nd∶YAG陶瓷材料的激光工作波长为1.065μm,和相同组分的单晶相比存在轻微的红移现象;随着透射光波长的增加,透光率逐渐增加,在可见光区透光率约为45%,在近红外光区透光率约为58%。更多还原

【Abstract】 Transparent polycrystalline neodymium-doped yttrium aluminum garnet ceramics（Nd∶YAG） with better chemical stability,excellent optical and high temperature mechanical property is becoming a new laser host material.The Nd∶YAG precursor powders with loosely dispersed,slightly agglomerated and YAG cubic crystal phase were synthesized at 1100 ℃ by the co-precipitation method combined with the reverse strike,using Nd₂O₃,Y₂O₃,Al（NO₃）₃·9H₂O and NH₄HCO₃ as raw materials,（NH₄）₂SO₄ as electrical stabilizer,TEOS as sintering additive.The Nd∶YAG transparent ceramics were fabricated after being sintered at 1700 ℃ in vacuum for 5 h.The Nd∶YAG ceramic materials were characterized by the TG-DTA,XRD,FT-IR,TEM,FT-PL and FEG-ESEM.The results show that the precursor powders are amorphous at 800 ℃,large amount YAlO₃（YAP） and tiny amount Y₃Al₅O₁₂（YAG） appear when the calcination temperature is 890 ℃ and the YAP hexagonal crystal phase transforms to YAG cubic crystal phase at 1012 ℃.There are agglomerations in the precursor powders resulting from high calcination temperature and the agglomerates link together,but as a whole the particles distribute homogeneously.The lasing wavelength of(Nd_0.01Y_0.99)₃Al₅O₁₂ transparent ceramics is 1.065 μm and there exists a slight red-shift compared to the single crystal with the same chemical composition.With the increasing of optical wavelength,the transmittance of(Nd_0.01Y_0.99)₃Al₅O₁₂ raises gradually and the optical transmittance is about 45% in the visible light and 58% in the infrared light.更多还原