Dislocation-free P-doped float-zone monocrystals of SixGe1-x, with x-values of up to 0.15, were diffused with Pt or Fe. The electron paramagnetic resonance spectra of Pt and Fe were detected only at x-values of up to 0.024. It was suggested that a line-broadening, with increasing x-value, was a possible reason for the difficulty in detecting Pt and Fe. Line-splittings implied the existence of definite neighboring arrangements of transition metals with respect to Ge atoms. Even in the case of dislocation-free Si0.976Ge0.024, the Pt concentration was 2 orders of magnitude smaller than the Si concentration. It was concluded that Pt atoms were incorporated into the lattice as alternative non-paramagnetic defects because, even for x = 0.13, more than 1016/cm3 of P donors were compensated.

M.Höhne, U.Juda, J.Wollweber, D.Schulz, J.Donecker, A.Gerhardt: Materials Science Forum, 1995, 196-201, 359-64