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March 2001

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From:
"Ingemar Hernefjord (EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 19 Mar 2001 13:48:37 +0100
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Hi TNuts,
got this from Bev one hundred years ago. Just wonder what method would be best for examining possible nickel that has diffused through Immersion Gold and then oxidized, and if somebody even tried? We have tried TOF-SIMS, machinist doing good job, but interpreting not for poor grassroots. E.g. number 7) below, what in George W Bush's  name is that?
Ingemar Hernefjord
Ericsson Microwave Systems

--------------------------------------Year 1898,  or maybe my marking meant something else-----------------------------------

SEM/EDX will not tell you whether you have tin(II) or tin(IV) oxide.  In
fact, unless you have a very $ expensive EDX it won't tell you if there is
any oxygen there at all!  Most EDX don't go any lower than sodium in the
periodic table.  To determine the type of tin oxide present you have several
options, all of them but one not easy:
1) top-of the-line geology grade mass spec with quantitative capability
2) Auger (will detect oxygen and I presume from the amount you might be able
to infer type of oxide?)
3) ESCA (determines oxidation state of all elements)
4) Mossbauer Spectroscopy (determines oxidation state of tin and some other
elements)
5) Raman Spectroscopy (like infra-red spectroscopy, measures molecular
vibrations.  There are definite differences between stretching vibrations of
tin(II) and tin(IV).  May not give good spectra if a lot of organic crude
around that will cause the sample to fluoresce.)
6) And then there are really fancy things like EELS and PAS, which I know
very less about!  :)
and finally
7) If there is an accessible, flat surface with this stuff on it you and
just use SERA (Sequential Electrochemical Reduction Analysis), a form of
chronopotentiometry, which will tell you which oxide and how thick.

regards,
Bev Christian
Nortel

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