I'd like to thank everyone for their thoughts and input on this question.
Without the Rietveld list I would not know where to begin.
Thanks again,
John O’Callaghan
Subject: RE: % CrystallinityDate: Wed, 27 Feb 2008 22:30:43 -0600From: [EMAIL
PROTECTED]: [EMAIL PROTECTED]: [EMAIL
; Spilling, Christopher; Fraundorf, Philip; Wilking,
Janet B.; Liu, Jingyue; Corey, Joyce Y.; Rath, Nigam
Subject: RE: % Crystallinity
As Pamela Whitfield indicates below, this is not a straightforward
issue. Reading the reference in Dr. DM's posting, one see that it is
necessary to have 100
Hi all,
Please prepare for a shameless plug for the newly certified NIST SRM
676a:
In order to measure amorphous content (via non-PDF diffraction methods)
one needs two things: 1) An unbiased diffraction method for measurement
of phase abundance (laughter please) and 2) A standard of known phase
John ( others),
The best way to determine %crystallinity (or %amorphous) is to do spiking
experiments with material with known (preferably ~100%) crystallinity. The
change in the apparent phase fractions by Bragg intensities as compared to that
expected from the masses can be used to estimate
Determination of crystallinity can be a fraught subject, because it is
usually assumed in such measurements that the background is from
amorphous material while the sharp peaks are from crystalline material.
So the standard way to do this would be to have a method for extracting
the background and
]
From: Von Dreele, Robert B. [mailto:[EMAIL PROTECTED]
Sent: Wed 2/27/2008 10:52 AM
To: rietveld_l@ill.fr
Subject: RE: % Crystallinity
John ( others),
The best way to determine %crystallinity (or %amorphous) is to do spiking
experiments with material with known (preferably
it isn't and good
sample preparation is vital.
Pam
From: Von Dreele, Robert B. [mailto:[EMAIL PROTECTED]
Sent: Wed 27/02/2008 11:52 AM
To: rietveld_l@ill.fr
Subject: RE: % Crystallinity
John ( others),
The best way to determine %crystallinity (or %amorphous
From: Von Dreele, Robert B. [mailto:[EMAIL PROTECTED]
Sent: Wed 27/02/2008 11:52 AM
To: rietveld_l@ill.fr
Subject: RE: % Crystallinity
John ( others),
The best way to determine %crystallinity (or %amorphous) is to do spiking
experiments with material with known
