Bismuth has rhombohedral lattice with a = 4.75 A & tin has a tetragonal structure with a = 5.82A & c = 3.17A.
What is the composition of the alloy? Typically the Bi-Sn system forms two distinct phases in the solid state. Could it be that if you try peak-fitting the system goes for a crystal lattice that fits all peaks, while they come from two different lattices?
Hello Ludger. Thank you for the suggestion. Yes I was trying to fit all the peaks. You are right. I should identify peaks for Bi and Sn separately and proceed. I will be in touch. Thank you again. The composition was 30% Bi.
This is a typical error when we use only mathematic fits; any diffraction pattern needs previously a physical interpretation and then the use mathematical tools.
Best regards,
Pedro
Very true. Thank you so much Sir. SEM did show the two different phases. I was just eager to use fit all peaks! Thanks again
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