Silicon Wafer

[rae]

Hi all,

My HOD and physics teachers went to a recent Physics teachers conference(?) and saw a silicon wafer that increases in conductivity as it is heated. Does anyone know about this and if so where do you get the silicon wafers?

Thanks

[Labbie]

Not in the CSIS, would like to know more.

[macca]

just googled can get on eBay out of US not cheap. Would like to knowm more too!

[Rita]

Sounds similar to a prac we recently did as a teacher demo, under the heading of metal reactivity.
Substance will not conduct electricity in the solid state.
If you go to this website you will see diagram and method..... http://www.nuffieldfoundation.org/print/3055
We did not use the rheostat nor ammeter so as to keep it simple.
Instead of using lead bromide it states Zinc chloride is a safer option. In our case we used Stannous Chloride and it worked very well. I am keeping the crucible with the end product for use next time.

[smiley]

Just south of San Francisco maybe??