The discussion centers on the characterization of coal char particles sized 6 to 15 mm using X-ray diffraction (XRD). Participants confirm that XRD results differ between lumped samples and powdered samples due to variations in sample packing and orientation of the constituent powders. It is established that lump samples may lead to errors in peak intensity and potential peak broadening. The need for specialized XRD equipment capable of analyzing lump samples is emphasized, as standard powder XRD may not yield accurate results for larger, irregularly shaped samples.
PREREQUISITESResearchers in materials science, geologists, and professionals involved in coal characterization and analysis who require insights into the differences between lump and powdered sample XRD results.
rubensudhakar said:I want to characterise a coal char particle of size 6 to 15 mm using XRD. I am aware of powder XRD being done. But I want to subject the sample as it is as a lump particle. Is any such XRD possible. Will the XRD results of lumped sample differ from that of the powder sample? Please explain.
bluemonster said:Hi !
I think X-ray diffraction results of lumped sample and powder sample are different.
At first, I know have two forms of sample which prepared to characterize by XRD, are thin film and powder. That means XRD instrument will analysis better for closed packing sample. If your sample include "bulk" powders, it can not reach to closed packing as well as two forms above.
The second, when you use lumped sample, it means that content is powders. Each powder has specific orientation in sample, and give diffraction beam differently. So, if it can, you still have some errors about peak intensity and may be peak broaden ...
Some ideas.