Hello everyone, I hope you can help me with answers to some presumably simple questions.
I have some material with nanometer sized Cu crystallites that show anisotropic line broadening. Depending on preparation the 200 integral breadth is 40-60 % larger than 111 integral breadth. Intuitively, I do not expect such an effect from size anisotropy in a cubic material because of the high symmetry, but reading up on litterature and old Rietveld list posts makes me less confident and more confused. I would like to understand exactly how the line widths are calculated for a given shape of crystallites. Reading Langford & Wilson (1978), JAC 11, 102-113 and Langford & Louer (1982), JAC 15, 20-26, I don't understand how multiplicity is handled and what the effect is of shape with respect to the crystallographic orientations. I suspect that the broadening may be caused by stacking faults or twinning, but how do I determine whether this is the case? Best regards, Jens ph.d. student Jens Wenzel Andreasen Risoe National Laboratory Frederiksborgvej 399 DK-4000 Roskilde Denmark Phone: +45 4677 4720 Fax: +45 4677 5758 ------------------------------------------------------- If your messages to me are rejected take a look at: <http://www.risoe.dk/ita/email/liam_uk.htm> -------------------------------------------------------
