Describe the roles of alumina and alkali oxides in ternary Al2O3-Na2O-SiO2 glasses?

Describe the roles of alumina and alkali oxides in ternary Al2O3-Na2O-SiO2 glasses? 

1. Write a detailed essay on the differences and similarities in the structures and properties
of B2O3, SiO2, GeO2 and P2O5 glasses?
2. What is “boron oxide anomaly”? Describe how it affects the properties of B2O3-based
glasses.
3. Describe the roles of alumina and alkali oxides in ternary Al2O3-Na2O-SiO2 glasses?

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