Dear researchers,
I have a powder sample with needle shape particles, and I faced some problem with the Preferred Orientation of the particle. which may cause problems when measuring the crystallite size and microstrain.
Are there any tricks to avoid this problem when scanning the powder with x-ray diffractometer.
best regards
Crush then in a pestle and mortar...In morphology though (like microscopy) you may prefer an oriented particle...
Dear Mohammed,
in addition to crushing/milling your needles as Alan proposed, spinning the sample during XRD measurement is method of choice that reduces preferred orientation artifacts.
Please have a look on your XRD system for a spinning stage.
http://pd.chem.ucl.ac.uk/pdnn/inst1/spinner.htm
http://www.gbcsci.com/products/xrd-products/xrd-stages/
Carefully prepare the sample after crushing!
That means fill the mold step by step thereby use a glass slide to result in a plane surface but do not press the powder with the slide during the sample preparation. (Filling, covering, gently knocking and compressing, decovering, filling, ...)
@Michael Doesn't have to be a mold/mould. Could be a (rotating) Lindemann tube as Gerhard hints above... 'Distant cousins there's limited supplies and we're down to the dozens and this is why...:' (courtesy of Don Van Vliet).
http://www.hilgenberg-gmbh.de/en/catalog/remaining-stock/mark-tubes-made-of-special-glass-lindemann-remaining-stock/
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