湿化学法制备的KTiOPO_4@SiO_2玻璃陶瓷纳米结构和透明性  

Nanostructure and Transparency of KTiOPO_4@SiO_2 Nanocrystalline Glass-Ceramics by Wet-Chemical Route

作　　者：李东林[1] 田苗[1] 李倩[1] 马守龙[1] 谢荣[1] 苟蕾[1] 樊小勇[1] 赵鹏[1] 

机构地区：[1]长安大学材料科学与工程学院,长安大学新能源材料与器件研究所,西安710061

出　　处：《无机化学学报》2013年第9期1903-1908,共6页Chinese Journal of Inorganic Chemistry

基　　金：教育部高等学校科学技术重大项目培育资金项目(No.708084);国家自然科学基金(No.21073021);中央高校基本科研业务费专项资金(No.CHD2010ZD008;CHD2011ZD007)资助项目

摘　　要：用湿化学法合成了25KTiOPO4-75SiO2透明纳米玻璃陶瓷。采用x射线衍射、场发射扫描电子显微镜和二次谐波发生对玻璃陶瓷物相及纳米结构进行了分析。透明凝胶块经过热处理后，从SiO2基玻璃中析出了粒径为一30nm的KTiOPO4纳米晶体，形成了透明KTiOPO4@SiO2纳米玻璃陶瓷；凝胶粒子的烧结致密化消除了大量不规则介孔，但形成了少量30nm的球状孔；这种相对致密的玻璃陶瓷在可见光波段的光学透射率为64％左右。根据纳米结构数据，利用瑞利散射模型分析了纳米结构对玻璃陶瓷透明性的影响，结果表明，KTiOPO4晶体与SiO2玻璃相折射率之差是降低致密纳米玻璃陶瓷透明性的主要因素。Transparent 25KTiOPO4-75SiO2 （KTP@SiO2） nanocrystalline glass-ceramics were synthesized by the wet-chemical method. Morphology and nanostructure of the KTP nanocrystals embedded in the silicate glass were characterized by means of X-ray diffraction （XRD） and field emission scanning electron microscope （FESEM）. The results show that, KTP nanocrystals with the size of -30 nm are precipitated from SiO2-based glass in the heat-treated transparent gels, forming KTiOPO4@SiO2 nanophase glass-ceramics. At the same time, a large amount of irregular mesopores were eliminated, but small amount of spherical nanopores with 30 nm-diameter form. This type of relatively dense glass-ceramic exhibits the optical transmittance of about 64% in the visible region. Based on nanostructure data, the effects of the nanostructure on the transparency of the glass-ceramics were analyzed according to Rayleigh model. It shows that the ratio of the refractive indices decreases the optical transmittance of the KTiOPO4@SiO2 nano-glass-ceramics in the visible region.

关 键 词：磷酸钛氧钾 二氧化硅 溶胶 凝胶 纳米玻璃陶瓷 透明性 二次谐波发生 

分 类 号：O611.3[理学—无机化学]