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- W2044499186 abstract "Abstract The solid state reactions occurring in the mechanically activated system SrCO 3 –Fe 2 O 3 (composition X Fe ( iron cationic fraction )=0.5 –0.923) have been studied. At X Fe =0.5, SrFeO 2.5+ x (brownmillerite) forms by annealing of the activated mixture at 850°C under nitrogen while the non-stoichiometric perovskite (SrFeO 3− x ) is the equilibrium product when annealing is performed under air. At X Fe =0.66 a mixture of SrFe 2 O 4 and SrFe 2 O 5 is the final product no matter what is the annealing atmosphere. The enthalpies of reaction at these composition have been determined. By increasing iron content ( X Fe =0.8), the annealing at 850°C of the activated mixture leads to SrFe 2 O 4 , SrFe 2 O 5 and SrFe 12 O 19 (indicated in the following with the usual term of strontium hexaferrite). Finally at X Fe =0.923, SrFe 12 O 19 is produced from the mechanically activated mixture at temperatures lower (≈800°C) than in the case of conventional solid state route. In the case of the last two compositions no reaction enthalpy could be determined as the process is too slow." @default.
- W2044499186 created "2016-06-24" @default.
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- W2044499186 date "2002-02-01" @default.
- W2044499186 modified "2023-09-27" @default.
- W2044499186 title "Solid state synthesis of strontium oxoferrates from the mechanically activated system SrCO3–Fe2O3" @default.
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- W2044499186 doi "https://doi.org/10.1016/s0025-5408(01)00767-x" @default.
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