离子浓度和分散剂对合成Nd:YAG粉体晶相的影响

摘要

以碳酸氢铵为沉淀剂,共沉淀合成了Nd:YAG陶瓷粉体.分析了合成过程中盐溶液离子浓度和分散剂含量对粉体后期晶相转变的影响.研究结果表明盐溶液浓度在0.16 mol·L?1和0.32 mol·L?1时,煅烧过程中粉体出现Y2O3、YAM等过渡晶相,这些过渡相需要在更高的温度才能完全转化为纯YAG晶相.当盐溶液浓度降低到0.08 mol·L?1,pH调节到8.0时,各组分离子和掺杂离子达到分子水平的均匀混合,合成粉体煅烧过程中直接转化为YAG晶相.添加的分散剂24SO?对Al2O3和Y2O3扩散反应生成YAG晶相有一定的阻碍作用.采用纯相的Nd:YAG粉体制备的多晶透明陶瓷获得了1.6W的激光输出.%The effects of metallic cation concentration and dispersant on the crystal phase of Nd:YAG powders were studied. The powders were prepared by co-precipitation with ammonium hydration carbonate as precipitator. The crystal phase of Y2O3, YAM was observed at 0.16 mol·L?1 and 0.32 mol·L?1 of the metallic cation concentration. The solution with pH 8.0 and 0.08 mol·L?1 metallic cation concentration was suitable for the preparation of the Nd:YAG nanopowders. A small amount of sulfate ions dispersant influenced the dispersion and the phase transformation of the precursor during the calcining process. Nd:YAG transparent ceramic with high in-line transmittance was obtained by sintering the green body prepared by co-precipitation powder. 1.6 W laser output at 1064 nm was obtained with a 6 W pump power.