If the asymmetry of the profiles is also anisotropic I guess on stacking
faults on close packed planes 00l. However, the HKL law looks little bit
strange to me ...
Radovan
Jae-Ho Chung a écrit :
Dear all,
I would appreciate any comments for the following problem.
I have been studying samples (ABO2) with a rather simple R -3 m structure.
Although I had expected their neutron powder diffraction refinement should be
simple, I encountered a strange problem. Many of the peak positions are quite
off from where they should be. For instance, I singled out and refine (0 0 3),
(0 0 6), (0 0 9) & (0 0 12) separately. Quite strangely, (0 0 6) peak is
noticeably off when (0 0 3), (0 0 9) and (0 0 12) are good. For full
refinements, such problem shows up for several peaks. I see same trend from
data measured at two different instruments: CW and TOF. FYI, the peak profiles
are quite Lorentzian and asymmetric.
Anybody have experiences such a problem, and/or have suggestions what is going
on? I would greatly appreciate.
Jae-Ho
*************************************
Jae-Ho Chung, Ph.D.
NIST Center for Neutron Research
100 Bureau Drive, Stop 8562
Gaithersburg, MD 20899-8562
Tel. 301-975-8369 (office)
301-975-5085 (SPINS)
240-506-8389 (cell)
Fax. 301-921-9847
e-mail: [EMAIL PROTECTED] (work)
[EMAIL PROTECTED](personal)
*************************************
--
Radovan Cerny
Laboratoire de Cristallographie
24, quai Ernest-Ansermet
CH-1211 Geneva 4, Switzerland
Phone : [+[41] 22] 37 964 50, FAX : [+[41] 22] 37 961 08
mailto : [EMAIL PROTECTED]
URL : http://www.unige.ch/sciences/crystal/cerny/rcerny.htm
