Abstract
The films of CuxS(1⩽x⩽2), prepared by evaporation in vacuum and condensation of stoichiometric sulphides of copper, change their phases by heat treatment in vacuum. Cu2S chalcocite appears as the most stable phase in the range 270 to 450° C and the other sulphur rich phases transform into chalcocite presumably by a loss of sulphur. By electron diffraction we have confirmed the low temperature monoclinic chalcocite phase, the high temperature hexagonal chalcocite phase, the monoclinic djurleite phase, the cubic digenite low and high temperature forms and the hexagonal covellite phase. The low temperature digenite phase presents a superstructure which is similar to that observed by Kazinetset al. on digenite prepared by evaporation in vacuum on a single crystal substrate of NaCl at temperatures of 350 to 400° C. Electron diffraction data of chalcocite (Cu2S), djurleite (Cu∼1.93S), digenite (Cu1,8S) are presented.
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Leon, M., Terao, N. & Rueda, F. Phase transitions in cuprous sulphide evaporated thin films. J Mater Sci 19, 113–120 (1984). https://doi.org/10.1007/BF02403116
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DOI: https://doi.org/10.1007/BF02403116