摘要
采用溶胶–凝胶法合成了Yb:Gd3Ga5O12(Yb:GGG)多晶粉体。利用X射线衍射、热重-差热分析、扫描电镜、红外光谱、荧光光谱测试手段,对前驱体及煅烧的粉体的结构、形貌及光谱性能进行了研究。结果表明:950℃煅烧的粉体已是属于体心立方的晶体结构的Yb:GGG纯相。热重–差热分析表明:Yb:GGG超细粉体的总的质量损失为29.13%,初晶化温度在830.6℃附近,粉体在1246℃左右晶化程度较高。随着煅烧温度的提高前驱粉体粒度不断增加,形成Yb:GGG纯相的最佳的煅烧温度为950℃,所获得的纳米粉体粒度约为80～100nm,粒径均匀、分散性和流动性较好。荧光光谱表明,主要发射峰位于1030nm,是Yb3+的基态2F7/2与激发态2F5/2能级跃迁导致的荧光发射。
Ytterbium-doped gadolinium gallium garnet （Yb：Gd3Ga5O12, Yb：GGG） polycrystalline powder were synthesized by a sol-gel method. The structure, morphology and spectral properties of both the precursor and calcined powders were investigated by X-ray diffraction, thermogravimetric-differential thermal analysis, scanning electron microscopy and infi＇ared and fluorescence emis- sion spectroscopy. The results show that the Yb：GGG powder calcined at 950 ℃ is an Yb：GGG pure phase with a body-center-cubic structure. The total mass loss of Yb：GGG powder is 29.13% under heat treatment of 950 ℃. The initial crystallization for Yb：GGG powder occurs at about 830.6 ℃, and the degree of crystallization for Yb：GGG powder is much higher at temperatures above 1 246 ℃ The grain size of the precursor powder increases constantly with the increase of calcining temperature. The nano-particle powder of pure phase Yb：GGG calcined at 950 ℃, and has a particle size of about 80-100 nm with small and even grain sizes, better dispersibility and fluidity. The analysis of the fluorescence spectra shows that the main emission peak exists at 1 030nm due to the transition of Yb^3＋ from the excited state ^2F5/2 to the ground state ^2F7/2.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2008年第8期1163-1167,共5页
Journal of The Chinese Ceramic Society
关键词
掺镱钆镓石榴石晶体
溶胶-凝胶法
多晶粉体
性能表征
ytterbium-doped gadolinium gallium garnet crystal
sol-gel method
polycrystalline powder
performance characterization
