DCHAS-L Discussion List Archive
Date: Mon, 16 May 2011 14:17:06 -0400
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: ILPI <info**At_Symbol_Here**ILPI.COM>
Subject: Re: Inorganic chemistry Cu + AgI or AgSe --> black solid?
In-Reply-To: <BE28425130279043A5B92A2BC7116E233D105E**At_Symbol_Here**EXCH-MBOX-1.exch.ucr.edu>
The copper/silver redox
couple favors formation of Cu2+ and Ag(0), no discharge required.
This driving force should be the same whether the source of silver
ion is Ag2Se or AgI.
If the AgX solid is being
heated or ablated or has some other means of making it into the gas
phase, then it could be a direct reaction to Cu2Se, CuSe, Cu2I
etc.
As to the identity of the black solid, an
SEM-EDAX, if available and possible, should tell you if it has Se or I
in it and give you ratios of Cu:X.
Rob
Toreki
=======================================================
Safety Emporium - Lab & Safety Supplies featuring brand
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On May 16, 2011, at 11:54 AM,
Russell Vernon wrote:
We have a small
mystery.
In a vacuum chamber with an ion
pump, the researchers recently experienced having all the open copper
surfaces coated with a black solid
They
had recently introduced AgSe (solid) to the chamber which also contained
AgI
One
opinion is that the chamber experienced an ion discharge which oxidized
the copper to copper oxide
Have you-all had this experience
before?
Ideas?
Thanks,
-Russ
Russell Vernon, Ph.D.
Director
Environmental Health &
Safety
University of California,
Riverside
900 University Ave
Riverside, CA
92521
Direct (951) 827-5119
Admin (951)
827-5528
Fax (951) 827-5122
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