Expressions for interdiffusion coefficients were derived in the literature, but they are all based on the concentration gradient.
关于二元合金互扩散系数的表达式，虽然有过推导，但是在推导过程中都是以扩散组元的浓度梯度为出发点。
Below the glass strain temperature, interdiffusion coefficients are almost independence of sodium oxide concentration in the glasses and somewhat increase with long ion exchange time.
低于玻璃应变温度，互扩散系数几乎不依赖玻璃中的氧化钠浓度，而略随离子交换时间增加而增大。
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