CAT (composition analysis by thickness-fringe) method
CAT (composition analysis by thickness-fringe) method
The "CAT" method is devised to determine the compositions of layer materials that have the same lattice spacing but have different compositions between the layers, like an artificial lattice material of AlxGa1-xAs. Utilizing the fact that the distance between thickness fringes (extinction distance) is inversely proportional to the crystal structure factor, this method determines the compositions of the different layers by measuring the difference of the extinction distances between the layers of a wedge-shaped specimen.
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