In d e r Literatur gibt es nur fragmentarische Angaben Uber orientierte K r istallisation diinner SnTe-, SnSe-und SnSSchichten (1 bis 4) und &er Untersuchungen d e r optischen Eigenschaften dieser Schichten (5, 6).

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Molecular models of polymorphs modifications of zinc chalcogenides have been designed. Based on the results of ab initio quantum chemical calculations of the crystal structure of clusters the temperature dependences of the Gibbs energy of sphalerite and of wurtzite have been found. Phase transformations "sphalerite-wurtzite" temperatures have been evaluated.