Re: PARTICLE-SIZE for Rietveld

Lachlan Cranswick ( lachlan@melbpc.org.au )
Sat, 27 Apr 1996 17:02:13 +1000 (EST)

Would anyone have a better suggestion to purchasing something like
a British made McCrone Microniser for getting a sample down to a small
particle size <2-5micron(?) while minimizing the risk of destroying the
crystallinity of the sample in the process?

Main potential disincentive of this could be the cost for a new
McCrone microniser (A$4,000 to A$5,000).

Comments?

Lachlan.

>X-ListName: Rietveld Method Users <rietveld@xtal.cmc.uab.edu>
>From: MASS@sauron.quimica.uniovi.es
>Reply-To: MASS@sauron.quimica.uniovi.es
>Subject: PARTICLE-SIZE
>To: rietveld@xtal.cmc.uab.edu
>
>Hi Rietveld Users:
>
>We are working in Rietveld and ab-initio powder structure
>determination. For sample preparation we use hand grinding
>in an agate mortar and a 37 microns sieve but successive
>experiments show variations in the intensities of the peaks.
>
>We know that to obtain accurate X-ray diffraction intensities
>from a powder sample require that the grain size be small,
>at least 10 microns and preferably small.
>The question is how to obtain these particle-sizes and
>how to sieve powders so small.
>I would be very gratefully if someone could answer me.
>
>Thanks in advance
>
>Miguel A. Salvado
>
Lachlan Cranswick _--_|\
Melbourne PC User Group, Australia / \
E-mail : lachlan@melbpc.org.au \_.--._/
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