CJ, When doing any quantitative analysis based on intensity one must ensure that the sample is larger than the diffracting volume; i.e. the area of projection is larger at lower angles while the depth of penetration decreases. Make sure the sample is long enough and thick enough. When doing this type of analysis you must collect as large of an angle range as needed to get enough crystalline and amorphous scattering. If your sample is large enough sample holders will not be a problem, if it is not this causes issues with the measurement but using a zero background holder will eliminate the additional amorphous scattering but the analysis will be in error. If you do not have profile fitting software (using profile fitting one can do this by hand if you can also fit the amorphous content) you could plot the scans out and cut out the amorphous and crystalline peaks and weight them, then remove the crystalline peaks and weigh them, to get the ratio of crystalline area to total area.
Hope that helps some, Ed On Thu, Jul 12, 2018 at 7:44 AM, 최종락 <jonglakc...@gmail.com> wrote: > Dear All, > Hi, how are you, guys. > My name is Jonglak choi, who is working on obtaining quantity of > crystalline through CI(%)-cyrstal index for natural cotton (cellulose type > I). We have Rigaku XRD instrument for obtaining defraction pattern from the > cotton yarns. In order to know about the quantity of crystalline phase out > of natural mixture of amorphous and crystalline cellulose, I think that 1. > I should run XRD to get real one without preferred orientation and z-shift, > 2. I should have good and easy way to separate the phases. > Do you have any suggestion for 1, and 2 above in my statement? > For example. > 1. Running XRD, I found glass slides in the room for XRD, quartz or pyrex > glass plates; I am interested in 18 degree, and ~20 degree 2theta. which > one I can use and background problem? > If I simply wrap around the glass slide, hair from yarn should be problem? > because it will stick out and move during the collection? > If I grind the yarn into powder-it becomes cotton ball after grinding in > wiley mill-and fixed on the glass slide with geese, is there any concern? > > 2. Processing data, after collecting diffraction pattern, what is the best > and easy way to know how much crystalline phase exist out of amorphose? I > do not have a software for deconvolution now. > > I am looking forward to hearing suggestions. > > Thank you and have a great day > > Best, > > CJ > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Please do NOT attach files to the whole list <alan.he...@neutronoptics.com > > > Send commands to <lists...@ill.fr> eg: HELP as the subject with no body > text > The Rietveld_L list archive is on http://www.mail-archive.com/ > rietveld_l@ill.fr/ > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > > -- Dr. Edward A. Laitila Senior Research Engineer/Scientist II/Adjunct Assistant Professor Michigan Technological University Dept. of MSE Room 628 M&M Building (906) 369-2041
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