Mazur O. Interaction in the ZnS(ZnO) – Ln2S3(LnSF) systems: phase composition and optical properties

X-ray diffraction analysis, DTA, spectroscopy of diffuse reflectance, IR spectroscopy, and chemical analysis were used to analyze the exchange interaction between oxygen-containing compounds of zinc (mainly zinc oxide) and lanthanide sulfides Ln2S3 and sulfofluorides LnSF (where Ln=La, Nd, Sm, Gd, Dy, Tm) resulting in the production of zinc sulfide and the relevant oxosulfide or oxofluoride of lanthanide. The synthesis conditions of sulfofluorides of some lanthanides from sulfides and fluorides have been optimized. The processes occurring in the ZnO-Dy2S3 system with the determination of the beginning and termination of the interaction in the system were examined by a visual-polythermic and thermographic methods. The method of additives qualitatively determined the content of oxide impurities in zinc sulfide, obtained by various methods (precipitaion of zinc ions with hydrogen sulfide, self-propagating high-temperature synthesis and CVD method). A film-forming material for interference coatings based on zinc sulfide doped with lanthanum sulfofluoride has been developed and patented. The compositions of optical materials for vacuum evaporation based on zinc sulfide doped with gadolinium and dysprosium sulfides have been optimized.