【摘要】 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。更多还原

【Abstract】 The YAG precursor powders were synthesized using Y2O3, HNO3, Al(NO3) 3·9H 2O and Nd(NO3)3 ·6H2O as raw materials. Neodymium-doped yttrium aluminum(Nd:YAG) precursor precipitates with different neodymium contents were synthesized by homogeneous precipitation combined with direct drying and supercritical carbon dioxide fluid drying. The calcined samples were characterized by XRD, TG/DTA, FT-IR, BET, SEM and fluorescence spectrophotometer. The results showed that: homogeneous precipitation method, calcined at 800 ℃ for 2 h, using the supercritical carbon dioxide fluid drying of YAG powder obtained has a higher purity; Compared to direct drying, the supercritical carbon dioxide fluid drying of the obtained powder finer granularity, distributed more evenly, agglomeration improved. The fluorescence spectra showed that the emission spectra and excitation spectra intensity increased with the rising of the sintering temperature, but it increased before the Nd-doped content 0.8%, and then it descend with the increase of Nd-doped content.更多还原