Published online by Cambridge University Press: 31 January 2011
Non-stoichiometry is a characteristic feature of ternary chalcopyrites like Cu-III-VI2 (III=In,Ga; VI=S,Se). The results of a comparative study of structural trends within the homogeneity region of the chalcopyrite type α-phase of the Cu2Se(S)-In2Se3(S) and Cu2Se(S)-Ga2Se3(S) quasibinary phase diagrams are presented. Powder samples of Cu-rich and Cu-poor [Cu2Se(S)]1-y-[In2Se3(S)]y as well as [Cu2Se(S)]1-y-[Ga2Se3(S)]y alloys were prepared (0.4<y<0.6) by solid state reaction of the elements (T=850°C) and investigated by X-ray powder diffraction and electron microprobe analysis. It was shown that the grain size depends on composition and structural parameters. The tetragonal distortion η=c/2a has been determined for the different trivalent cations and influences the microstructure in Cu-poor Cu1-xIII1+x/3VI2 samples. In Cu-rich samples the Cu-content is in all cases the driving force for the formation of the homogeneous microstructure observed.
Full text views reflects PDF downloads, PDFs sent to Google Drive, Dropbox and Kindle and HTML full text views.