Hi,
Besides strain and instrument also size broadening can be close to a
Gaussian if the crystallite size distribution is very narrow. For zero
dispersion of size distribution the size peak profile is about 75% Gaussian
and 25% Lorentzian (on tails). For details see JAC (2002) 35, 338-346 (self
citation) and other ref. cited there (Langford, Louer, Scardi (2000))
Best,
Nicolae Popa
----- Original Message -----
From: "Maxim V. Lobanov" <[EMAIL PROTECTED]>
To: <rietveld_l@ill.fr>
Cc: "Дмитрий А. Павлов" <[EMAIL PROTECTED]>
Sent: Tuesday, October 21, 2008 9:20 AM
Subject: question on size-strain analysis
Dear colleagues,
I have a probably very basic question related to size-strain analysis:
we have a pattern of a nanocrystalline oxide, which shows (from
Williamson-Hall plot) almost purely size broadening, and shape of
reflections is to good accuracy Gaussian.
I am curious what type of microstructure this Gaussian behavior can
reflect.
Maybe it is just something usual, but so far I had only observed
predominantly Lorentzian broadening in similar materials...
Sincerely,
Maxim.
-------------------------------------------
Dr. Maxim Lobanov
R&D Director
Huntsman-NMG
mailto: [EMAIL PROTECTED]
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