A new sight into the glass forming ability caused by doping on Ba-and Ti-site in BaTi_(2)O_(5) glass  

作　　者：Hao Liu Xuan Ge Qiaodan Hu Fan Yang Jianguo Li 

机构地区：[1]Shanghai Key Laboratory of Materials Laser Processing and Modification,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Materials Science & Technology》2020年第19期112-118,共7页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(Nos.51971138,51727802 and 51821001);the National Natural Science Foundation of ChinaExcellent Young Scholars(No.51922068);the National Key Research and Development Program(No.2017YFA0403800);the Shanghai Pujiang Program(No.19PJ1404400)。

摘　　要：La-and Nb-doped BaTi_(2)O_(5)(BT2)spherical glasses were prepared by a containerless aerodynamic levitation method and their glass-forming regions were established.It is found that La-doping on the Ba-site(network-modifier)and Nb-doping on the Ti-site(network-former)show distinct difference in the glassforming region:less than 10%La can replace Ba whereas 40%Nb can incorporate into BT2 glass.The distinction in glass-forming ability induced by La-and Nb-doping is discussed mainly from the structural arrangement of the glass.Raman spectroscopy analysis shows that La-doping elongates the short Ti-O bonds in the distorted[TiO_(5)]polyhedra and thus relaxes the network.Nb-doping introduces[NbO_(6)]polyhedra into BT_(2) and there exists a critical doping level(20%),below which incorporation of Nb into BT_(2) relaxes the[TiOn]polyhedra by shortening the long Ti-O bond and above which[NbO_(6)]starts to participate in the network skeleton construction resulting in a dramatic change in the glass structure,which is supported by the dramatic change in the exothermic peak on the DTA curves.This work triggers the speculation that the network-modifiers in BT_(2) glass possess a very important role in the structure of network-former skeleton than those in glasses based on traditional network-former oxides such as SiO_(2),GeO_(2) and B_(2)O_(3),which may provide a useful strategy for modifying the properties of these novel glasses by chemical doping.

关 键 词：Glass forming ability BaTi_(2)O_(5)glass DOPING Aerodynamic levitation Solidification 

分 类 号：TQ171.1[化学工程—玻璃工业]