Magnetic disaccommodation in Sn substituted magnetite

The relaxation of the initial magnetic permeability has been measured in po lycrystalline Sn-doped magnetite with nominal composition SnxFe3-xO4 with x ranging from x = 0 to 0.6. In the temperature range between 80 and 500 K, the time decay of the initial permeability after sample demagnetization has been represented by means of isochronal disaccommodation curves, which sho w the presence of different relaxation processes at 250 K (IV' peak), 275 K (IV), 300 K (III), 400 K (II) and 440 K (I). This behavior is explained on the basis of the disaccommodation of vacancy-doped magnetite and another s imilar tetravalent substitution, as the previously analyzed Ti-doped magnet ite. (C) 2001 Elsevier Science B.V. All rights reserved.