Preparation and properties of novel Tb3Sc2Al3O12 (TSAG) magneto-optical transparent ceramic

Novel Tb₃Sc₂Al₃O₁₂ (TSAG) magneto-optical transparent ceramic was fabricated by vacuum sintering. The phase composition, microstructure, optical quality, thermal properties, and magneto-optical properties of TSAG ceramic were measured. It is shown that the increase in holding time has an effect on the grain size of TSAG ceramic. It is noted that TSAG35 ceramic presents the highest transmittance, corresponding to 81.5 % at the wavelength of 1064 nm. The thermal properties of TSAG ceramic are close to or superior to that of the reported TSAG and TGG crystals. The Verdet constant of TSAG ceramic is comparable to that of reported TSAG crystal, and 1.2 times that of TGG crystal. The results indicate that the novel TSAG ceramic is comparable to TSAG crystal in terms of magneto-optical properties and superior to TGG crystal, making it a candidate material for magneto-optical materials to be used in high-power lasers.     

共沉淀法制备Tb_3Sc_2Al_3O_(12)纳米粉体的研究

采用共沉淀法制备TSAG纳米粉体,确定粉体制备的最佳工艺条件。以NH_4HCO_3为沉淀剂,通过反滴定法获得了TSAG前驱体,通过TG-DSC,XRD,FTIR和SEM测试手段对不同温度和不同保温时间下煅烧的粉体进行了表征。结果表明:前驱体在800℃时为非晶态,在800℃~900℃之间形成中间晶相TbScO_3和TbAlO_3,1200℃下煅烧6h得到TSAG粉体,所得到的TSAG纳米粉体纯度高、粒径分布均匀,晶粒尺寸约50nm。     

溶胶-凝胶法制备Tb_3Sc_2Al_3O_(12)纳米粉体的研究

以柠檬酸为螯合剂,采用溶胶-凝胶法制备TSAG纳米粉体。通过XRD、FTIR和SEM测试手段对不同pH值和不同煅烧温度下合成的粉体进行了表征。结果表明:当温度为1000℃、pH值为3.3~3.6时,可以合成纯度较高的TSAG相,分布均匀,平均粒子尺寸为23.25nm;且随着烧结温度的升高,其粒径不断增大。     

两种不同方法制备TSAG纳米粉体的对比研究

采用溶胶-凝胶法和共沉淀法制备TSAG纳米粉体,利用XRD和SEM等测试手段对不同方法合成的TSAG纳米粉体进行表征,并根据谢乐公式计算出粉体粒径大小。结果表明共沉淀法经1200℃煅烧6h可得纯度高,平均晶粒尺寸为49.7nm的TSAG粉体,溶胶-凝胶法经1000℃煅烧3h可得纯度高,平均晶粒尺寸为23.25nm的TSAG粉体。从煅烧温度、保温时间以及制备所得粉体粒径大小对这两种方法进行比较。相较于共沉淀法,采用溶胶-凝胶法可获得晶相更纯,粒径更小,颗粒分布均匀,分散性能好的TSAG粉体,且此方法更省时节能。