Two Pt-atom defects were investigated: one orthorhombic and one monoclinic. The monoclinic defect was formed only in samples which were assumed to be supersaturated with self-interstitials. Electron paramagnetic resonance investigations gave no clue as to additional constituents of the complexes. The electron paramagnetic resonance spectrum of a monoclinic two Pt-atom defect suggested a model with two Pt atoms located at nearest-neighbour sites in a divacancy. This implied the existence of a true monoclinic Pt-Pt pair as well as a possibly existing orthorhombic one. Some complex defects were formed only in samples which were quenched after annealing; with the surface covered by metallic Pt. Paramagnetic six Pt-atom clusters and monoclinic two Pt-atom defects belonged to this group of defects. Although the samples which were treated in this way were assumed to be supersaturated with self-interstitials, the model for the monoclinic two Pt-atom defect did not involve self-interstitials.

Two Platinum-Atom Complex Defects in Silicon - an Electron Paramagnetic Resonance Study U.Juda, M.Höhne: Journal of Physics - Condensed Matter, 1999, 11[39], 7615-25