Rawplot refinement formula

2004-03-22 Thread ling yang
Hi, May I ask what is the exact formula used by rawplot refinement? There are 6 parameters: pos, int, alp, bet, sig, gam, what are their meanings? If i want to compare the changes of a peak at different banks or different temperature, what is the most important parameter?   Thanks:)   Ling Y

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2004-03-26 Thread ling yang
Dear all,   I have some questions concerning the refinement of the gppd data and would appreciate your advice: 1) The patterns show some kind of texture(up and down on the error curve), but the sample is powder(although maybe the granules are large) and should be isotropic. All banks show thi

Re:

2004-03-26 Thread ling yang
covered in book "Fundamentals of Powder Diffraction and Structural Characterization of Materials" by V.K.Pecharsky & P.Y.Zavalij. Kluwer Academic Publishers, Spring 2003. (www.amazon.com, www.wkap.nl)   Peter Zavalij -----Original Message-From: ling yang [mailto:

Has anybody answered Yong-Il Kim 's question about occupancy

2004-04-15 Thread ling yang
I have the same question, so post his question here: Dears all, In the structural refinement of ABO3 type, e.g. A1-xCxB1-yCyO3 using GSAS. The dopant (atom C) may be occupied two atomic sites, A and B. Therefore the occupancy constraint should be considered. In order to perform the structural refin

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2004-06-30 Thread ling yang
Dear Rietveld users,   I have some difficulty to refine a structure. A double-lattice superstructure is suppose to superimpose on the orginal one, the lattice length is slightly deviated. But when I tried to do this, the refinement is poor even after I fix the fraction of the 2nd phase to be

May I ask where to buy some plastic balls and rods

2004-10-13 Thread ling yang
to build a lattice? It will be better if they are colorful and flexible to change the bond angle. Thanks.   Sincerely,   Ling YangDept of CME, Univ of CincinnatiCurrent address:Bldg 8600, MS 6474SNS, Oak Ridge National LaboratoryOak Ridge, TN 37830Tel: 865 574 0350Fax: 865 241 5177

A question about stacking faults

2004-10-06 Thread ling yang
Dear all,   Are there anybody experienced in stacking faults? Please help me! Basically I'm following Warren's book and R. Berliner's paper to simulate the possible effects of stacking faults on diffraction patterns. I did generate a set of patterns for fcc, but there are some questions I'm

CEL files

2006-07-25 Thread ling yang
Usually you have to modify the file a little bit, or just rewrite one. Every software is different. Read the manual. Sincerely, Ling Yang -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, July 25, 2006 6:30 PM To: rietveld_l@ill.fr Hi, I am trying to

RE: Powder Diffraction In Q-Space

2007-02-21 Thread ling yang
I extract the data and plot all the curves myself in Origin:) You may find it's much easier to control in this way, and the file can be saved for later revise, although it takes time. Sincerely, Ling Yang -Original Message- From: Luca Lutterotti [mailto:[EMAIL PROTECTED]

Is it possible in GSAS to control the value of certain parameters in a

2007-04-23 Thread ling yang
For example, Uiso>0, 0

RE: new gsas

2007-05-09 Thread Ling Yang
thanks. Sincerely, Ling Yang -Original Message- From: Von Dreele, Robert B. [mailto:[EMAIL PROTECTED] Sent: Thursday, May 03, 2007 5:26 PM To: rietveld_l@ill.fr Subject: new gsas Hi All, New versions of GSAS for Windows and Fedora-5 have been placed on the CCP14 web server. The changes are as