Re: Problem of low-angle

Dear Chuisy, The broad bump you are experiencing at low angle may be to do with the slits. One has to be careful with these new XRD machines which have variable slits, to make sure the divergent and the anti-scattering slits are equal and if you choose to keep the slits fixed, which usually

Re: preferential orientation

Dear Christian (and others) your reply about preferred orientation probabaly not being a problem with a cubic mineral is of interest to me. This is something I have wondered about in the past because of observations I have made on common salt, so I thought I would contribute to this discussion

Re: Dislocation loop and broadening

In this case it is case it is expected that there will be formation of dislocation loops in the material due to irradiation. Well, simulations which would be made on the same material in the case of different kinds of dislocations and defaults could say if really the line-broadening is the

Re: preferential orientation

Dear Stephen, You are quite correct. I was going to make the same reply to Christian's comment also using NaCl as an example. What I would add though is that NaCl may be more prone to preferred orientation as the cubes are close to perfect - in contrast to say cubic zeolites where I have

Re: preferential orientation

your reply about preferred orientation probabaly not being a problem with a cubic mineral is of interest to me. I can testify to have seen huge preferred orientation occuring in some cubic perovskites, at least. Too much intensity in those h00. Armel

Re: Problem of low-angle

Hi, Looking at the attached file, my opinion is that this effect is caused by a quite large divergent (or both divergent and anti-scattering) slits. It is not normal to have over 1000 counts at 5 degrees 2-theta. This could be due either by a portion of incident beam or by a scattering from the

Re: Problem of low-angle

Dear William, Thank you for your kind suggestion. Well, our XRD is not a very new model, we use a fixed divergent slit, receving slit and antiscattering slits. But I need to check them whether the divergent and anti-scattering slits are in the same sizes. When I added the anti-scatter slit, the

[no subject]

Hi All, There is a new version of Windows GSAS on the CCP14 web server. The biggest change is that it will now do Pawley style extractions for one set of reflections from multiple powder patterns. This is done inside GENLES. See below for note on this other changes. Linux other versions will

Le Bail - Gof

I am using the software Quanto to quantify some simple patterns, mixes of calcite and quartz. I read a lot of information about Rietveld, but I have not enough knowledgments about crystal structures, PO, etc. I refined a pattern of 15% of quartz and 85% of calcite. I got a Gof of 1.9 using Model

Re: Problem of low-angle

Dear Stephen, I apologise for calling you chuisy last time round. One suggest to test the size of the footprint is, I think, to use common rock salt. Grind this up and place liberally over your plate and you can check at low angle where the X-rays are striking the plate, because the salt will go