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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Self-diffusion of lithium in LiAlSi _2O _6 glasses studied using mass spectrometry
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Self-diffusion of lithium in LiAlSi _2O _6 glasses studied using mass spectrometry

机译：锂在LiAlSi _2O _6玻璃中的自扩散研究

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摘要

In order to improve our understanding of the transport mechanisms of lithium in glasses, we have performed diffusion and ionic conductivity studies on spodumene composition (LiAlSi _2O _6) glasses. In diffusion couple experiments pairs of chemically identical glasses with different lithium isotopy (natural Li vs pure ~7Li) were processed at temperatures between 482 and 732 K. Profiles of lithium isotopes were measured after the diffusion runs innovatively applying femtosecond UV laser ablation combined with inductively coupled plasma mass spectrometry (LA ICP-MS). Self-diffusion coefficients of lithium in the glasses were determined by fitting the isotope profiles. During some of the diffusion experiments the electrical conductivity of the samples was intermittently measured by impedance spectrometry. Combining ionic conductivity and self-diffusivity yields a temperature-independent correlation factor of ～0.50, indicating that motions of Li ions are strongly correlated in this type of glasses. Lithium self-diffusivity in LiAlSi _2O _6 glass was found to be very similar to that in lithium silicate glasses although Raman spectroscopy demonstrates structural differences between these glasses; that is, the aluminosilicate is completely polymerized while the lithium silicate glasses contain large fractions of nonbridging oxygen.
机译：为了增进对玻璃中锂传输机制的了解，我们对锂辉石成分（LiAlSi _2O _6）玻璃进行了扩散和离子电导率研究。在扩散耦合实验中，在482至732 K之间的温度下，对具有不同锂同位素（天然Li与纯〜7Li）的化学性质相同的玻璃对进行了处理。在扩散运行后，创新性地应用飞秒UV激光烧蚀与电感结合，测量了锂同位素的分布耦合等离子体质谱（LA ICP-MS）。通过拟合同位素分布，可以确定玻璃中锂的自扩散系数。在一些扩散实验中，通过阻抗光谱法间歇地测量样品的电导率。结合离子电导率和自扩散率可得到约0.50的温度独立相关因子，表明这种类型的玻璃中锂离子的运动密切相关。尽管拉曼光谱证明了这两种玻璃之间的结构差异，但发现LiAlSiSi _2O _6玻璃中的锂自扩散性与硅酸锂玻璃非常相似。就是说，硅铝酸盐被完全聚合，而硅酸锂玻璃包含大部分非桥连氧。

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