Effect of choice of alkali cation Flashcards

1
Q

What is viscosity a function of?

A

~ number of NBO’s formed

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2
Q

What’s the effect of heavier cations?

A

~ heavier cations like Na+ and K+ give HIGHER DENSITY than with Li+
~ although K+ is heavier than Na+, it dialates the network more
~ the larger the cation, the greater the hard-sphere type ionic packing = higher CTE

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3
Q

Why is the index of refraction of Li2O-Si2O higher?

A

> the small Li+ ions pull network ions closer together
higher conc of NBO give higher increase in index of refraction with R2O additions with Li2O

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