A NUCLEAR-SPIN-LATTICE RELAXATION STUDY OF THE MIXED-ALKALI EFFECT IN GLASSES

被引:6
作者
WILLIAMS, RD [1 ]
ELLIOTT, SR [1 ]
机构
[1] UNIV CAMBRIDGE,DEPT CHEM,LENSFIELD RD,CAMBRIDGE CB2 1EW,ENGLAND
关键词
D O I
10.1016/S0022-3093(05)80474-0
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The Li-7 nuclear spin-lattice relaxation time has been measured as a function of temperature for a series of mixed-alkali Li-Na disilicate glasses. No evidence of a pronounced non-linear mixed-alkali effect was found for the low-temperature activation energy, E(LT), of the spin-lattice relaxation (SLR) rate, nor of the ratio E(LT)/E(sigma) (where E(sigma) is the dc conductivity activation energy). These results can be interpreted, in terms of Elliott and Owens' diffusion-controlled relaxation model for SLR, as indicating that there is no significant change in the number of mobile ions in mixed-alkali glasses; instead, the mixed-alkali effect must be due to changes in the ionic mobility.
引用
收藏
页码:43 / 49
页数:7
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