Hairspray works quite well for thin samples (no comment from me as to
whether environmentally friendly non-aerosol is as good as aerosol as I
haven't tested it yet).  Getting a nice even coverage from the sieve can
take a bit of practice as well.  Together with nail varnish for sealing
capillaries visitors to my lab must  sometimes think I'm very vain!

 

Pam

 

From: Peter Y. Zavalij [mailto:[EMAIL PROTECTED] 
Sent: May 8, 2008 12:48 PM
To: 'Kurt Leinenweber'
Cc: rietveld_l@ill.fr
Subject: RE: Preferred orientation?

 

Kurt,

An old way used for alloys is: 

grease the surface of the sample holder (preferably backgroundless) with
some sticky stuff and sieve the powder onto it. The particles will fall
down and stuck at random orientations, unless they are large plates or
needles.

Peter Zavalij 

Director,  X-ray Crystallographic Center
Department of Chemistry and Biochemistry
091 Chemistry Building
University of Maryland
College Park, MD 20742-4454

Phone: (301)405-1861
Lab:   (301)405-1861
Fax:   (301)314-9121
E-mail: [EMAIL PROTECTED]
http://www.chem.umd.edu/facility/xray/

 

 

________________________________

From: Kurt Leinenweber [mailto:[EMAIL PROTECTED] 
Sent: Thursday, May 08, 2008 12:37 PM
To: rietveld_l@ill.fr
Subject: RE: Preferred orientation?

Hi all,

 

This thread  gives me a chance to ask a question I've had for a long
time.  I've heard about these large chambers where you can mix your
sample with a binder and have it fall out as small powder spheres to
avoid preferred orientation in Bragg-Brentano geometry.  But, my samples
are mostly between 10 and 50 milligrams in size. Does anyone know a way
to mount them without preferred orientation?  Thank you!

 

                                                - Kurt

 

 

________________________________

From: Whitfield, Pamela [mailto:[EMAIL PROTECTED] 
Sent: Thursday, May 08, 2008 9:16 AM
To: Kurt Leinenweber
Subject: RE: Preferred orientation?

 

It's one of the classic needle-shaped materials - it gives lovely SEM
images if you can avoid charging

 

From: Kurt Leinenweber [mailto:[EMAIL PROTECTED] 
Sent: May 8, 2008 12:12 PM
To: Whitfield, Pamela
Subject: RE: Preferred orientation?

 

HI Pamela/all,

 

This sounds intriguing.. why is wollastonite a problem in capillary
transmission?  Is it needle-like?

 

                                                            - Kurt

 

________________________________

From: Whitfield, Pamela [mailto:[EMAIL PROTECTED] 
Sent: Thursday, May 08, 2008 7:55 AM
To: rietveld_l@ill.fr
Subject: RE: Preferred orientation?

 

I do that myself but it doesn't always help much if you've got something
like wollastonite! J

 

From: Martin [mailto:[EMAIL PROTECTED] 
Sent: May 8, 2008 10:51 AM
To: rietveld_l@ill.fr
Subject: RE: Preferred orientation?

 

Forget all that long winded stuff. Just collect the data on capillary
transmission geometry and avoid all (well, most of) the fuss.
 
Martin Vickers

________________________________

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