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Re:Re: [sdpd] ABOUT FWHM PARAMETERS /SHAPE PARAMETER
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<p>At 21:46 24/11/2009 +0800, you wrote:<br>
<br>
>Hi<br>
> Today, one sample have produced, the sample has a interesting <br>
> phenomenon which I can not understand.<br>
> The sample contains Li Eu W O(Li:Eu:W=1:<wbr>1:2). Maybe LiEu(WO4)2<br>
> question:<br>
> 1. why about 4 peaks are extremely high, and how can I explain <br>
> weak peaks? But I cannot match any PDF card. How can I do?<br>
> texture? Maybe this sample has small volume? I do not know what <br>
> it is. And I can not index it.<br>
> This sample can emit red light(at 612nm, maybe because of EU3+).<br>
> XRD: fast scan in 15 minutes.10-65 degree.<br>
> SEM(EDS):EU:<wbr>W=1:2 and Eu:W=1:1 ,maybe it contains impurity <br>
> phase.<br>
>please advice....thanks in advance!<br>
> xujun<br>
<br>
I would say that these questions will have answers when you will find<br>
the solutions. For a diagnostic, the powder diffractionist needs for<br>
one, or better, several powder patterns ;-).<br>
<br>
Are your 4 peaks harmonics ?<br>
<br>
About texture, in case of sample pressed on a plate holder, the advice is :<br>
be sure you have texture effects by recording a second pattern, dusting<br>
the sample through a sieve on the holder.<br>
<br>
Best wishes,<br>
<br>
Armel<br>
Concerned by age<br>
(smiling at the "age concern" IUCrCompComm subject)<br>
<br>
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