Soda Lime glasses Flashcards

1
Q

What characterizes soda lime glasses?

A

~ additions of CaO to Na2O-SiO2 glass

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2
Q

What effects does adding CaO to Na2O-SiO2 have?

A

~ increased viscosity and chemical durability

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3
Q

What happens chemically in soda lime glasses?

A

~ Ca2+ is more polarizing to O2- (more covalent) and charge compensates 2 NBO’s

~ the Ca2+~O2- bond is harder to shear than the Na+~O2- bond

~ electrical conductivity decreases as Ca2+ is LESS MOBILE and blocks migration of Na+

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4
Q

What are the effects of Al2O3 additions to soda lime glass?

A

~ increase durability
~ reduce NBO’s (increase index of refraction) by reverting the role of Na+ to CHARGE COMPENSATOR for AlO4- tetrahedra

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