The effect of mixed alkali on structural changes and ionic migration characteristics in zinc borate glasses

被引:25
作者
Li, Ao [1 ,2 ]
Wang, Mitang [1 ,2 ]
Li, Mei [1 ,2 ]
Liu, Zhaogang [1 ,2 ]
Hu, Yanhong [1 ,2 ]
Zhang, Xiaowei [1 ,2 ]
机构
[1] Inner Mongolia Univ Sci & Technol, Sch Mat & Met, Baotou 014010, Peoples R China
[2] Minist Educ, Key Lab Green Extract & Efficient Utilizat Light, Baotou 014010, Peoples R China
基金
中国国家自然科学基金;
关键词
ZnO-B2O3; glass; MAE; Chemical stability; Dc conductivity; Structure; SPECTROSCOPIC PROPERTIES; ELASTIC PROPERTIES; THERMAL-EXPANSION; WATER CORROSION; CONDUCTIVITY; BEHAVIOR; SPECTRA; IMMOBILIZATION; TEMPERATURE; ALUMINUM;
D O I
10.1016/j.matchemphys.2018.07.013
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of mixed alkali on structural changes and ionic migration characteristics have been investigated in zinc borate glasses system with composition 5Al(2)O(3)-15ZnO-(15-x)K2O-xNa(2)O-65B(2)O(3)(x = 0,3,6,9,12,15mol%). The thermal properties including glass transition temperature (T-g), thermal expansion coefficient (alpha) and dilatometric softening temperature (T-d) were determined by differential scanning calorimeter (DSC) and dilatometer. The ionic migration characteristics were investigated through dc conductivity and chemical stability, determined by electrochemical workstation and normalized mass losses (N-(i)). And the glass structure was characterized by Fourier transform infrared spectroscopy, to explain the relationship between structure and properties. As the ratio of [Na2O]/([K2O]+[Na2O])(mol/mol) increase, the glass transition temperature (T-g), dilatometric softening temperature (T-d), dc conductivity(sigma(dc)) and normalized mass losses (N-(i)) of glass exhibit a nonlinear variation, deviate negatively from linearity, meanwhile thermal expansion coefficient (alpha) varies nonlinearly and deviates positively from linearity. From the FTIR studies the N-4 values (fraction of tetrahedral coordinated boron atoms) exhibit a nonlinear variation, deviates negatively from linearity. These data clearly indicated the presence of strong mixed alkali effect (MAE) in the zinc borate glass system, and the MAE changes glass structure and inhibits ion migration.
引用
收藏
页码:519 / 526
页数:8
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