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- W2000255775 abstract "The relaxation of the initial permeability is measured in polycrystalline strontium doped magnetite with initial compositions SrO-nFe 2 O 3 , with n ranging between n=16 and n=122.34. The samples have been sintered at 1300° C in a reducing CO 2 atmosphere and rapidly quenched to provide the presence of crystal vacancies In the temperature range between 80 and 500 K, the time decay of the initial permeability after sample demagnetization is represented by means of isochronal curves. The behavior is similar to a previous study dealing with barium doped magnetite, i.e., the existence of two relaxation peaks centered at temperatures of 300 and 365 K. These relaxation processes are related with thermally activated jumps of ferrous cations into lattice vacancies. However, it's noteworthy to point to the existence of some differences. As we can see in the maxima of the isochronal spectra, a new peak appears at temperatures close to 160 K, only when there is at least a certain amount of strontium in the initial composition (n < 39.95). This new peak appears also in compounds with the hexagonal SrM-phase studied elsewhere and is explained in terms of the formation of a secondary phase with hexagonal structure." @default.
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- W2000255775 date "1998-06-01" @default.
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- W2000255775 title "Magnetic disaccommodation in Sr doped magnetite" @default.
- W2000255775 doi "https://doi.org/10.1051/jp4:1998282" @default.
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