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*

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
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> Moderator: Ellery Frahm, [log in to unmask],
> Electron Microprobe Lab, University of Minnesota
>
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>
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> *
>
> 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]
>>
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>>
>> 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
>>
>>
>