EMS162-2010_ExtraCredit_UnknownPowder

EMS162-2010_ExtraCredit_UnknownPowder - UNIVERSITY OF...

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UNIVERSITY OF CALIFORNIA, DAVIS Department of Chemical Engineering and Materials Science EMS 162: Structure and Characterization of Engineering Materials Extra Credit Problem – Identify the unknown powder In lecture, you were presented with the diffraction pattern (see below, left) from a mixture consisting of two powders. You were told that one of the powders was Al 2 O 3 , corundum and you were asked to identify the unknown powder. Using the PDF card for corundum (see below, right), you can identify the peaks resulting from corundum, and therefore the remaining peaks are from the unknown material. These peaks are enumerated in red in the figure below. Note that the peak 14 is somewhat wider than the other peaks and therefore it probably consists of two overlapping peaks with similar 2 θ values. 30 40 50 60 70 0 500 1000 1500 25.58 28.28 32.8 35.12 37.76 43.34 47 52.52 55.8 57.5 59.7 61.28 66.48 68.2 70.54 Intensity (a.u.) 2 theta (degrees) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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EMS162-2010_ExtraCredit_UnknownPowder - UNIVERSITY OF...

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