【作者】 李永绣； 吴燕利； 李颖毅； 罗军明； 孙伟丽； 冯晓平； 汪桂华； 周雪珍；

【Author】 Li Yongxiu, Wu Yanli, Li Yingyi, Luo Junming, Sun Weili, Feng Xiaoping, Wang Guihua, Zhou Xuezhen ( Research Center for Rare Earths & Micro/Nano Functional Materials, Nanchang University , Nanchang 330047, China)

【机构】 南昌大学稀土与微纳功能材料研究中心；

【摘要】 通过草酸复盐中间体制备了两种具有典型形貌的Y2O3:Eu超细粉末。结果发现:加料方式和反应程序对于特殊形貌产物的形成起重要作用。以草酸铵为沉淀剂,采用同步加料方式沉淀钇合成的Y2O3:Eu的SEM照片显示其为片状外形,其平面尺寸为0．6～1．5 μm,厚度为50 nm;而以草酸与氢氧化钇的转化反应制得的Y2O3:Eu为边长范围在300-500 nm的规则块状。两种中间体的XRD图均与NH4Y(C2O4)2·H2O 相对应。Y2O3:Eu的外观形貌分别与它们的草酸钇铵中间体的XRD分析结果相一致,表明在煅烧过程中外观形貌保持不变。Y2O3:Eu片和块的荧光光谱与商品荧光粉之间存在明显差别,在226 nm处都有很强的激发。更多还原

【Abstract】 Ultra fine Y2O3:Eu powders with two typical morphologies were prepared via double oxalate route. It is found that the feeding manner and reaction procedure plays a key role for the product formation of desired morphology . The SEM photograph of Y2O3: Eu synthesized by precipitating yttrium ion with ammonium oxalate as precipitant in synchronous feeding model shows sheet morphology with plane size ranging from 0.6 to 1.5 μm and sheet size around 50 nm. However , the Y2O3: Eu synthesized by converting from yttrium hydroxide with oxalate acid displayes regular block shape with side size range from 300 to 500 nm. The XRD patterns of both intermediates are identical with NH4Y(C2O4)2·H2O. The morphologies of Y2O3 : Eu are consistent with that of their corresponding ammonium yttrium oxalate intermediates analyzed by XRD, indicating that the morphology still remained on calcining. The luminescent spectra of Y2O3 :Eu sheet and block showed a strong excitation at 226 nm in their excitation spectra, which is different from that of commercial Y2O3:Eu.更多还原