Lecture 15: XRD and Other Analytical Techniques X-Ray Diffraction ...
Lecture 15: XRD and Other Analytical Techniques X-Ray Diffraction ...
Lecture 15: XRD and Other Analytical Techniques X-Ray Diffraction ...
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2 Types of <strong>XRD</strong>:<br />
(2) Powder <strong>Diffraction</strong>: X-ray finely powdered samples; r<strong>and</strong>om<br />
orientation ensure that all {hkl} planes will satisfy Bragg’s Law<br />
Ex. d 111 = 5Å {111} has high density<br />
n=1; d 111 = 5Å; CuK# = 1.54Å<br />
Then:<br />
n ! = 2d sin "<br />
(1) (1.54Å)/(2)(5Å) = sin "<br />
" = 17.74°<br />
Therefore, grains oriented at " = 17.74° will give strong diffraction peak<br />
In practice: measure " <strong>and</strong> intensity<br />
Calculate d hkl
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