Ingemar,
We routinly use Auger analysis for ENi/IAu. We do a surface survey to
determine what is on the surface of the IAu and then we depth profile
through the IAu and compare the Auger depth profile measurement with our XRF
measurement. After depth profiling through the IAu we examine the condition
of the ENi near the ENi / IAu interface. We then sputter slightly into the
ENi to determine the P content.
Regards,
George
George M. Wenger, DMTS Bell Laboratories Princeton
Supply Network Solutions
PO Box 900, Princeton NJ 08542-0900
Route 569 Carter Rd., Hopewell, NJ 08525
(609)-639-2769 (Office), 3210 (Lab), 2346 (Fax)
[log in to unmask]
-----Original Message-----
From: Ingemar Hernefjord (EMW)
[mailto:[log in to unmask]]
Sent: Monday, March 19, 2001 7:49 AM
To: [log in to unmask]
Subject: [TN] Oxide examination
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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