Abstract
The atomic scale transformation mechanisms in Ag-Te and Cu-Se films, which grew by solid-solid reactions of metal with chalcogen films, have been investigated by high-resolution transmission electron microscopy, with the aid of image simulation and optical diffraction. By increasing supply of metal atoms into the chalcogen films, a hexagonal Te crystal transforms to hexagonal Ag 2− x Te 1+ x and then monoclinic Ag 2− x Te; and amorphous Se transforms to trigonal Cu 1− x Se and then hexagonal CuSe . The structures of the nonstoichiometric crystals of Ag 2 − x Te 1 + x , Ag 2 − x Te and Cu 1 − x Se have been determined.
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