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Message Icon Topic: Using solgel to make phophate glass(Topic Closed Topic Closed) Post Reply Post New Topic
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deopuram
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bullet Topic: Using solgel to make phophate glass
    Posted: 04 December 2001 at 11:17am
I am looking to make a phosphate based glass using solgel techniques. The questions I have are all related to the topic and categorize into the three following:

What kind of Tg can be acheived for phosphate glasses made by sol gel? I am looking for low Tg glasses - say in the range 300 Celsius. Are there other low Tg glasses besides phosphates which can be processed through solgel methods?

What would the optical properties of such a glass be? Transparent in the optical regime or not?

What kind of geometries can be acheived using solgel for phosphate glasses?

Any information on the above would be very helpful.
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bullet Posted: 06 December 2001 at 6:14am

Sol-Gel Low Tg

 I am effraid that sol-gel processing cannot changes drastically the Tg of the same theoretical composition as the one prepared by glass melting. The only thing which can make a difference is the amount of water incorporated in your glass by sol-gel.

Most of the low Tg glasses are phosphates based. Compositions in those systems can have extremely low Tg as low as 80°C (Tin-lead fluorophosphates)
Some old references:

Oxide glasses of very low softening point
N.H.Ray, R.J. Plaisted & W.D. Robinson
Glass Technology Vol 17 N° 2, 1976, 66
Id. Glass Technology vol. 14 N° 2, 1973, 50

Optical properties

There is no reason why  the optical properties could be different from the melted glass.

Geometry 

It depends in what form the material should be prepared
For films in principle any geometry can be worked out.
For bulk samples that's another story. Drying to a monolithic form and consolidate to glass is not straightforward.
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