Videos 4.3 & 4.4
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Concept development
The above represents a single crystal substrate (blue) upon which grains (white) have grown. The lattice parameter mismatch has led to a slight tilting or twisting of the grains. Let the lattice parameters be denoted a1s, a2s, a3s for the substrate. For the substrate, a3s is normal to the plane of the substrate. The crystal structure is the same between the substrate and the grains growin on top, but the chemical composition is different (thus the slight lattice mismatch). *
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What are the angle(s) between a3s (substrate normal) and a3 for the twisted and tilted films and why? (zero or non-zero)
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What are the angle(s) between a1s and a1 for the twisted and tilted films and why? (zero or non-zero)
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If you performed an omega rocking curve on the (001) reflection, which sample will give you the sharpest full width half maxima (FWHM)? Why?
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The film and substrate have cubic lattices. Recall a3s is normal to the substrate surface. How many peaks do you expect to see if you're doing a psi scan on the {111} family of reflections? Why?
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