Jor - 14-2-2011 at 15:43
As I always wanted to to some experiments with arsenic (making the element, making Paris Green, etc) I need a source of it for a small amount. I just
found a place where I can buy GaAs diodes for an acceptable price.
2 questions:
Are these diodes completely made out of the GaAs or are they coated with the stuff?
Is the stuff completely inert? if I wanted to make As2O3 (or sodium arsenite) from it, what would be the easiest way to get there, without
overoxidising it to As(V), as I already have about 5 g of As4O10 (I know I can reduce this with iodide, followed by evaporating the I2, but I rather
keep the As4O10).
Would it be possible to slowly digest it with NaOH/NaOCl with the bleach added drop by drop, or will this overoxidise to As(V). Or digestion with cold
nitric acid (i know nitric acid oxidises As(III) to As(V) but I don't know if the acid is required to be hot. Or is the GaAs completely inert?
Ofcourse I'd like to recover the gallium someway as well and reduce it the metal but that is of later concern.
All question, so references, I know. But I can't find a lot of references on arsenic chemistry, especially not how to make trivalent arsenic compounds
as As2O3 is the starting point on the chemistry of arsenic. Any ideas?
plante1999 - 14-2-2011 at 15:50
first generali diode ave a very tiny amount of material, than trying to extract it in good yield is near to imposible. i suggest you to buy some from
there, i have no reproch , good service:
http://www.hms-beagle.com/xampp/htdocs/shop/index.php?main_p...
or
http://www.hms-beagle.com/xampp/htdocs/shop/index.php?main_p...
Fleaker - 14-2-2011 at 20:04
Might be able to distill off the arsenic. I imagine it is not inert to oxygen at high temperature--arsenic oxides are typically volatile as well.