JEOL Probe Users Listserver Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab, University of Minnesota Post a message: send your message to [log in to unmask] Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask] On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html * Hello, An other alternative can be to use garnets. Here in our lab we had the chance that a group was studying Rare earth garnets and have synthetized a wide variety of RE garnets. For example for Gd we use Gd3Fe5O12 or Gd3Al5O12 as standards. Eric Eric Essene a écrit : > JEOL Probe Users Listserver > > Moderator: Ellery Frahm, [log in to unmask], > Electron Microprobe Lab, University of Minnesota > > Post a message: send your message to [log in to unmask] > > Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask] > > On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html > > > > * > > Owen, > Gd2O3 is usually a powder and cannot be polished well. Look at it > in reflected light or SEI and it should be clear if you have a > powder. If so, don't even try to use it for a standard (well, you > could tune up on it). The REE phosphates are nice crystals, free for > the asking at the Smithsonian, and (given a little Pb) work very well > when analyzing major levels of REE as in monazite and xenotime. The > REE glasses of Drake and Weill are nice as working standards but are > not as robust under a high beam current or under conditions (15 kV, > 10-20 nA) that produce relatively low count rates for REE. > eric > > > On Sep 7, 2008, at 5:12 PM, Owen P. Mills wrote: > >> JEOL Probe Users Listserver >> >> Moderator: Ellery Frahm, [log in to unmask], >> Electron Microprobe Lab, University of Minnesota >> >> Post a message: send your message to [log in to unmask] >> >> Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask] >> >> On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html >> >> >> >> * >> >> All, >> >> I've got a problem with a Taylor standard block, specifically Gd2O3 >> on the >> block. The surface of the remainder of the block is pretty good, but >> Gd2O3 is not. It almost looks swollen and is very rough, even pitted. >> I'm not sure I ever noticed because we've never needed it. I need it >> now >> (I mean right now) and have got to get in in better shape but I don't >> want >> to screw up the rest of the block. Maybe it would be best to make a >> separate mount of only Gd2O3 material? Do you have any ideas? >> >> I'd really like to start a discussion of how to get multi-element >> standard >> blocks in good shape and keep them that way. I am not a polishing >> expert >> and don't particularly want to be but I really don't want to trust >> this to >> someone else. Perhaps I could send them out to be re-polished? Who >> could >> do that? >> >> Thanks! >> >> Owen Mills >> Michigan Tech University >> >> >