稀土掺杂微晶玻璃的自结晶机理及性能调控  

Mechanism of Spontaneous Crystallization of Rare Earth Doped Glass Ceramics and Controllable Properties

作　　者：刘树江[1] 付贵珍[1] 单志涛 

机构地区：[1]齐鲁工业大学山东省玻璃与功能陶瓷材料加工与测试重点实验室,山东济南250353

出　　处：《中国稀土学报》2013年第6期681-688,共8页Journal of the Chinese Society of Rare Earths

基　　金：山东省优秀中青年科学家奖励基金(2008BS04004)资助

摘　　要：首次利用熔融冷却法制备了Yb3+/Er3+共掺透明微晶玻璃,即玻璃熔体在冷却过程中自发地析出纳米晶。探索了稀土氧化物和碱金属氧化物对磷硅酸盐玻璃熔体冷却过程中的自发结晶行为和上转换发光性能的影响。当玻璃组成中的碱金属氧化物仅有Na2O时,引入0.5%Yb2O3和0.125%Er2O3(摩尔分数)后晶体类型由Na3PO4变为Zn2SiO4晶体;K2O取代部分Na2O后未对掺杂前后的晶体类型产生影响,但是显著降低了Na3PO4或Zn2SiO4的结晶度;Li2O取代部分Na2O后,掺杂前后熔体自发析出的晶体都是Li3PO4。对于上转换发光性能,结晶程度越高,上转换发射强度越大,与碱金属氧化物种类无关,并给出了相关理论解释。本研究对稀土掺杂纳米晶透明微晶玻璃的节能环保型制造方式具有一定的理论意义和应用价值。Yb3 ＋/Er3 ＋ codoped transparent glass ceramics were prepared by melt-quenching devitrification method, i. e. , nanocrystals spontaneously formed during cooling of the melts. The effects of rare earth and alkali oxides on the spontaneous crystallization behavior during cooling and upconversion photoluminescence of the glass ceramics were investigated systemat- ically. Addition of 0.5% Yb2O3 and 0. 125% Er2O3 led to formation of Zn2SiO4 crystals rather than Na3PQ for the composition containing alkali oxide of only Na2 O. However, substitution of K20 or Li20 for half of Na20 resulted in different influence on spontaneous crystallization behavior, and introduction of K20 did not alter the crystalline types but reduce crystallinity of Zn2SiO4 and Na3PO4. Introduction of Li20 enhanced the precipitation of Li3PO4 rather than Zn2SiO4 or Na3PO4 for rare earth doped or undoped compositions, respectively. Furthermore, the increase in crystallinity promoted upconversition emission for all samples, and the reason was discussed. This work is of significance for theory and practical application of rare earth doped transparent glass ceramics obtained in an energy-saving way of preparation

关 键 词：熔融冷却法 自结晶 纳米晶 上转换发光 稀土 

分 类 号：TQ171[化学工程—玻璃工业]