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以Y2O3、HNO3、Al(NO3)3·9H2O、和Nd(NO3)3·6H2O为原料,采用尿素均相沉淀法制备了不同钕掺杂量的YAG前驱体粉末,分别用直接干燥和CO2超临界流体干燥对Nd∶YAG前驱体粉体进行脱水处理。用XRD、TG-DTA、BET、SEM和荧光分光光度计等测试手段对前驱体及煅烧样品进行表征。结果表明:采用尿素均相沉淀法,相对于直接干燥,CO2超临界流体干燥制的前驱体800℃煅烧2 h,可获得粒度更细,分散更均匀,团聚较少的纯YAG粉末。Nd∶YAG粉体的荧光发射光谱和激发光谱的相对强度均随温度的升高而增强,随钕掺杂量的增加呈先增大后减小的变化趋势,其中0.8%钕掺杂量样品强度最高。
YAG, HNO3, Al (NO3) 3 · 9H2O and Nd (NO3) 3 · 6H2O were prepared by homogeneous precipitation of urea. The powders of YAG with different amounts of Nd were prepared by direct drying and CO2 Critical Fluid Drying Dehydration of Nd: YAG precursor powders. The precursors and calcined samples were characterized by means of XRD, TG-DTA, BET, SEM and fluorescence spectrophotometer. The results show that pure YAG powder with smaller particle size, more uniform dispersion and less agglomeration can be obtained by Urea Homogeneous Precipitation method, compared with the direct drying and CO2 supercritical fluid drying precursor calcined at 800 ℃ for 2 h. The relative intensities of fluorescence emission spectrum and excitation spectrum of Nd:YAG powders both increase with the increase of temperature and increase first and then decrease with the increase of Nd doping content. The content of 0.8% Nd doping Highest intensity.