Re: Sodium doping on glass

Hi Guys,

Thanks for the input. It was very valuable.

I am not a Chemistry major and hence I don't know where to look for
the right resources. I would like to try out the idea proposed by
Andreas, but before that I need to calculate and also understand how
the process will work. So, if anyone would refer me to some good books
or resources that would be great.

I know that sodium waterglass is easily available. I don't know about
liquid soidum oxide. But based on everyone's experiences, is there
really a value to control the amount of sodium diffusing into silica
glass.

thanks once again,
max.




[EMAIL PROTECTED] wrote in message news:<[EMAIL PROTECTED]>...
> "Andreas Rutz" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>...
> > It won't be that that easy, like using normal soda-lime-silicate glass.
> > Fused silica doesn't contain ions that are easiliy exchanged. You need
> > sodium with a suitable anion, like oxide.
> > 
> > What about dippig the glass in liquid sodium oxide for some time (determine
> > experimentally, but not too long or everything will melt and deform, sodium
> > contant lowers the Tg of the fused silica.)
> > 
> > cooling down to room temp, wash off remainig oxide with water (careful!,
> > wear glasses)
> > 
> > Anneal glass in furnace (500°C to 1000°C, max. Temp. depends on sodium
> > amount that diffused into the silica)
> > 
> > I didn't try this procedure, it's the way I'd try this experimentally.
> 
> Didn't try the following myself, but how about dipping the wafer in
> sodium-waterglass and then do the over trick mentioned above by
> Andreas?