Abstract
The surface features of Na-β″-Al 2O 3 single-crystal films grown on sapphire and micro α-Al 2O 3 platelet substrates have been studied by atomic-force-microscopy (AFM). The height and spacing of the growth steps has been measured. Squeezing lines in the horizontal plane were detected and assumed generated by lattice misfits. The transformation mechanism of α-Al 2O 3 to β″-Al 2O 3 is discussed on the basis of the observed height of growth steps and surface characteristics of the as-grown Na-β″-Al 2O 3 films.
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