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Lithium disilicate Li2Si2O5, can be called which of the following materials?

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Lithium disilicate Li2Si2O5, can be called which of the following materials?

(a) Glass-ceramic

(b) Metal-organic

(c) Melts

(d) Metal-inorganic

I had been asked this question in an internship interview.

This key question is from Crystallization of Solutions, Melts, Glasses and Gels in chapter Preparative Methods of Solid State Chemistry

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Correct option is (a) Glass-ceramic

For explanation I would say: Li2Si2O5 is a glass ceramic material, which is a crystalline material of glassy intermediates and an important component of several commercial glass-ceramics. Crystalline Li2Si2O5 melts at 1032^oC.

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