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September 2008

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Subject:
From:
Eric J Essene 1 <[log in to unmask]>
Reply To:
JEOL-Focused Probe Users List <[log in to unmask]>
Date:
Tue, 9 Sep 2008 11:21:52 -0400
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JEOL Probe Users Listserver

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Electron Microprobe Lab, University of Minnesota

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*

Eric,
    We have GGG, a Gd-Ga garnet like YAG that is really great.  But  
most these materials are not so easy to come by.
eric



Quoting Eric Leroy <[log in to unmask]>:

> 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
>>>
>>>
>>
>
>
>

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