Thermal factor for magnetic phase?

2014-09-23 Thread Jae-Ho Chung
-Ho Chung, Ph.D. Associate Professor Dept. of Physics, Korea University Anam 5, Seongbook Seoul 136-701, South Korea tel.) +82-2-3290-3116, +82-10-2067-8389 fax.) +82-2-927-3292 * ++ Please do NOT

unit cell size limitation in GSAS?

2008-11-12 Thread Jae-Ho Chung
slightly larger than 17 Angstrom. Is this an intrinsic limitation of GSAS? Is there a way to get around it? Thank you very much. Jae-Ho *** Jae-Ho Chung, Assistant Professor Department of Physics, Korea University Anam-dong 5, Seongbook-gu Seoul 136

Conical magnetic moment in FullProf

2008-05-19 Thread Jae-Ho Chung
d expect "Beta=0" to be a cone with zero half-angle, but it results in zero moment in FullProfStudio and zero intensity in the simulation. What could I possibly be doing wrong? How do I get "conical" structure without assigning two moments on the same position? Thank you ve

Question on Rietveld with x-ray

2008-04-02 Thread Jae-Ho Chung
e. Jae-Ho *********** Jae-Ho Chung, Assistant Professor Department of Physics, Korea University Anam-dong 5, Seongbook-gu Seoul 136-713, Rep. of Korea tel.) +82-2-3290-3116 fax.) +82-2-927-3292 web.) <http://scattering.korea.ac.kr> http://scattering.korea.ac.kr ***

Strange peak positions

2007-02-14 Thread Jae-Ho Chung
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 C