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- W1988137822 abstract "Abstract Microstructure of the amorphous Fe 76 Mo 10 Cu 1 B 13 ribbons in the as-quenched state and after the annealing at 723 K for 0.5 h is studied by transmission electron microscopy and Mossbauer spectroscopy. In the as-cast state α -Fe medium range ordered (MRO) regions are revealed and become the nuclei of crystalline grains. Nanograins 6 nm in the average diameter are observed in the sample subjected to the heat treatment. Mossbauer spectrum at 300 K of the annealed sample is decomposed into three subspectra ascribed to the amorphous paramagnetic and ferromagnetic phases and interface. At room temperature nanograins do not contribute to the spectra in the form of a single sextet due to magnetic relaxations. At 77 K the single sextet can be evidently introduced and its hyperfine parameters indicate the existence of the α -Fe(Mo) crystalline phase. The Curie point ( T C ) of the amorphous phase in the annealed samples shifts from 277 K in the as-cast state to 320 K after the annealing. The maximum of the magnetic entropy change ( − Δ S M ) in the as-quenched state occurs at temperature around T C of the amorphous phase and distinctly decreases after the annealing and shifts towards higher temperature but lower than T C of the amorphous remainder. − Δ S M in the superparamagnetic temperature range, i.e. above the Curie temperature of the amorphous phase obeys the phenomenological relation: − Δ S M = a ( T ) B m / T + b B . m 2 / ( T − Θ ) 2 . The excellent | Δ S M | × B m − 2 = f ( B m − 1 ) linear dependences for both, as-quenched and annealed samples are observed." @default.
- W1988137822 created "2016-06-24" @default.
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- W1988137822 date "2015-07-01" @default.
- W1988137822 modified "2023-09-26" @default.
- W1988137822 title "Magnetic entropy change in amorphous and partially crystallized Fe–Mo–Cu–B alloy" @default.
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- W1988137822 doi "https://doi.org/10.1016/j.jmmm.2015.03.052" @default.
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