碳酸盐共沉淀法解决GGG单晶生长过程中的挥发问题

Synthesis of Polycrystalline GGG by Carbonate Co-precipitation Method for Crystal Growth

用碳酸盐作沉淀剂,采用无机体系共沉淀法制备了钆镓石榴石Gd3Ga5O12(GGG)前驱体.由TG-DTA和IR光谱分析表明,合成的沉淀为碱式碳酸盐,煅烧过程中失重为28.06％.XRD分析表明在1000℃煅烧3h可以得到晶化完全的GGG多晶料,通过与固相反应比较可知,碳酸盐共沉淀法制备GGG多晶料具有反应时间短、晶化程度高、煅烧温度低、Ga2O3挥发量少等优点.GGG晶体提拉生长表明,Gd2O3和Ga2O3的组分失配问题已经得到基本解决,从而大大提高了单晶的光学质量.

Gd3Ga5O12 (GGG) precursor was synthesized by a co-precipitation method using ammonium hydrogen carbonate as precipitator. TG-DTA and IR spectra indicated that the precursor was alkaline and the weight loss during calcination was 28.06%. The results of XRD analysis indicated that the polycrystalline powder was well-crystallized after calcination at 1000degreesC for 3h. Compared with the solid-state reaction, the carbonate co-precipitation had the merits of short reaction period, well-crystallization, low calcining temperature, and less volatilization. As a result, the volatilization and disproportion of Gd2O3 and Ga2O3 could be well controlled during crystal growth and the optical quality of single crystal was also improved.