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Moderator: Ellery Frahm, [log in to unmask],
Electron Microprobe Lab, University of Minnesota
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*
Hi,
this answer brings a question to my mind.
When is it possible to do a quantitative analysis on a probe with a
rastered beam on an inhomogeneous sample?
I sometimes get asked this, but even though the software allows it, I
always say no. I assumed that the matrix correction for every point in
the raster will be based on the average x-ray intensity, yet this
might be different than the matrix correction required at a given
point in an inhomogeneous sample.
Have I missed something?
Thanks,
Ron
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JEOL Probe Users Listserver
Moderator: Ellery Frahm, [log in to unmask],
Electron Microprobe Lab, University of Minnesota
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*
Most of the samples we receive are of this type (Platinum-Aluminide coatings
of engine parts). I use pure element standards and have pretty good
success. The difficulty is that the material is very inhomogeneous and the
customer usually wants an average composition. They require analyses with a
beam raster over a certain area of the coating. I usually have a set of
about 10-12 elements in the analysis.
Chuck Herrington
Geller MicroÅnalytical Lab, Inc.
978-887-7000
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_____
From: JEOL-Focused Probe Users List [mailto:[log in to unmask]] On
Behalf Of Ellery Frahm
Sent: Wednesday, April 04, 2007 12:01 PM
To: [log in to unmask]
Subject: [PROBE-USERS] Ni-Pt-Al standard?
JEOL Probe Users Listserver
Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab,
University of Minnesota
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* Probe folks,
I have a post-doc researcher here in one of our engineering departments who
is interested in analyzing a Ni-Pt-Al system. I've been trying pure metals
as standards for his samples, but obviously I'd like to minimize any
absorption or fluorescence issues there might be. Does anyone have any
experience with such a system? Do you know of suitable standards for such a
system, or have you just used pure metals?
Thanks,
Ellery
--------------------
Ellery E. Frahm
Research Fellow & Manager
Electron Microprobe Laboratory
University of Minnesota - Twin Cities
Department of Geology & Geophysics
Lab Website: http://probelab.geo.umn.edu
Personal Website: http://umn.edu/~frah0010
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