Dear all,
According to Caglioti relation, the dimensions of U,V,W are as
(angle)^2. So, should we treat their units as (centidegree)^2 in GSAS profile
menu? Thanking all
prasun
Dear all,
According to Caglioti relation, the dimensions of U,V,W
are as (angle)^2. So, should we treat their units as (centidegree)
^2 in GSAS profile menu? Thanking all
Yes. (FYI, this is in the GSAS manual).
According to Caglioti relation, the dimensions of U,V,W are as (angle)^2.
Quick question - does anyone have a trick to stop the Cagliotti formula
going negative? Prodd currently has a habit of bugging out on a
sqrt(negative) and I'm wondering how other folks worked around that, or
if I've
Back to basics. Caglioti Function is instrument function and is often times
used inappropriately.
Just my two cents worth (and these days, 2-cents ain't worth much...)
Frank May
St. Louis, Missouri U.S.A.
From: Jon Wright [mailto:wri...@esrf.fr]
Sent:
Jon Wright said:
Quick question - does anyone have a trick to stop the Cagliotti formula
going negative?
This can happen if the resolution is relatively flat, so that there is no
well defined minimum. Then the quadratic Cagliotti formula produces large
correlations between U,V,W. The trick is
Alan Hewat wrote:
Jon Wright said:
Quick question - does anyone have a trick to stop the Cagliotti formula
going negative?
This can happen if the resolution is relatively flat, so that there is no
well defined minimum.
Seems to be the problem - also rather close to zero anyway.
if
Hi,
I sent this to Jon this afternoon and thought that I'd pass the e-mail
on.
Here goes ...
You'll probably find a pre-PRODD CCSL subroutine that I wrote that
goes along the lines of
width^2 = u^2 * ( tan(theta)-tan(theta_m) )^2 + w^2
Two neat things about this equation is that it
From what I've read of Cagliotti's paper, the V term should always be
negative; or am I reading it wrong?
Additionally, there is some good work on the use of the Cagliotti (and TCHZ)
functions in the paper by Young and Desai; it also goes over how to incorporate
sample dependent terms into the
Dear Rietveld´s users,
I didn´t find the crystalline phase
K_6 H_2 Nb_6 O_19 .8H_2 O
in ICSD database, if you know how to get crystallographic data, please
let me know.
Many thanks in advance
Sasaki
--
_
Dr. Jose Marcos Sasaki (professor
