Can addition of any glass modifier (like K2O, or MgO ) suppress the crystallization of any particular phase (say, lithium disilicate) in lithium silicate glass system? If so, what is the possible reason behind that?
Thanks in advance.
Dear Santa Kolay thank you for your interesting and important technical question. It is the main goal in the manufacture of any glasses to prevent crystallization. Please have a look at the following review article which might help you on your analysis:
Crystallisation in oxide glasses – a tutorial review
Article Crystallisation in oxide glasses - A tutorial review
This article is freely available as public full text on ResearchGate
Santa Kolay
I’m sure that no one adds K2O to glass... And I’m fairly sure that that applies to MgO as well...
Thank you Dr. Frank T. Edelmann. The article is full of informations and conceptual. It is quiet helpful.
Thanks,
Santa
Dear Santa Kolay please not that, as mentioned by Alan F Rawle, glass modifiers such as K2O or MgO are not added as such to glass compositions. These compounds are commonly used as measuring units in glasses (and fertilizers) to determine the composition of a glass system. As a typical example please see e.g. the following article:
Crystallization behavior of SiO2–P2O5–CaO–MgO–Na2O–K2O bioactive glass powder
Article Crystallization behavior of SiO2–P2O5–CaO–MgO–Na2O–K2O bioac...
This article is freely available as public full text on ResearchGate.
In this work the starting materials for the glass composition are SiO2, Na2CO3, K2CO3, (MgCO3)4·Mg(OH)2·5H2O, CaCO3 and Ca3(PO4)2.
As you can see, especially the alkali metal and alkaline earth metal components are added as the carbonates. Compounds like Na2O and K2O would be too expensive and also difficult to handle.
Thank you Dr. Alan F Rawle and Dr. Frank T. Edelmann for your mention. I was using K2CO3 and Mg(OH)2 as a source of K2O and MgO respectively.
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