Abstract
The characterization of
various mixtures obtained by fractional recrystallization of sulphur-selenium
melts is described. Optical absorption spectra of thin films, mass spectra, and
X-ray diffraction data reveal two distinct ranges of homogeneity, the break
occurring at 14 at. % Se. The optical absorption edge of crystals containing
less than 14 at. % Se varies linearly with composition. A direct optical
transition to the conduction band of S8 and a transition due to
trapped excitons are thought to contribute to the excessive width of this
absorption edge.
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19 articles.
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