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Fig.1 Temperature variation of the mean positron lifetime ¦Ó in Fe75Si25(measured between 5 and 24 h after the temperature change) and Fe79Si21.The dashed lines indicate the ferromagnetic order-disorder transiions at Tc.
Fig.2 Temperature dependence of Fe and Ge diffusion in Fe3Si alloys of three different compositions.One D value for Si diffusion has also been measured.The Curie temperature have been indicated by vertical line segments.

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