It is clear that they wanted a very controllable amount of P on their silicon-wavers, i suppose there should exist (meta)phosphates which can be
decomposed more easily !
Any proposals?
HLR
[Edited on 6-5-2003 by BASF]madscientist - 6-5-2003 at 10:47
On a related note, here's an idea that occurred to me a few months back:
The cupric phosphate would be cheap and easy to prepare OTC - simply mix solutions of cupric sulfate and sodium phosphate, then filter out the cupric
phosphate (which would precipitate).BASF - 7-5-2003 at 05:30
Hmm, from my point of view it seems possible what you proposed.....
Why copper? i always wondered wether heavy metals can be decomposed more easily due to the less ionic character of the molecule, i suppose.
It is obvious from the above formula that a reductant such as carbon would help the reaction.
On the other hand, the purity will definitely be better, if no carbon is added.
Aluminum powder seems to be a compromise, but it is costly....
I should do some further search on flake-aluminum....
<sub>2</sub>
----> 4Cu<sub>3</sub>PO<sub>4</sub> + P<sub>4</sub>O<sub>10</sub> + 3O<sub>2</sub>