In present paper magnetic susceptibility (MS) of Si-Ge solid solution whiskers with 0,1-50 mkm in diameter was studied. Submicron whiskers are quasi-cylindrical crystals, while whiskers with d > 1 mkm are needle-like ones.

Si-Ge whiskers were grown by chemical transport reaction method in a sealed bromide tube. MS of whiskers was measured by Faradey method in magnetic fields (0,3-4,0) kQe at room temperature.

Size dependence of MS behaviour was found in the whiskers. This peculiarity has different nature for submicon and needle-like crystals. The main contribution in size effect for needle-like crystals makes presence of paramagnetic centers (mainly Pt impurity). Size effect revealed in submicron whiskers is caused by change of lattice MS, i.e., change in crystalline structure of the whiskers.

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