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Magnetic properties of nanostructured Fe92P8powder mixture

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
471
Identifiers
DOI: 10.1016/j.jallcom.2008.03.138
Keywords
  • A. Nanostructured Materials
  • B. Mechanical Alloying
  • C. Microstructure
  • D. Mössbauer Spectroscopy
  • D. X-Ray Diffraction

Abstract

Abstract Structural and magnetic properties of nanostructured Fe 92P 8 (wt.%) powder mixture prepared by mechanical alloying were investigated by X-ray diffraction (XRD), Mössbauer spectrometry and magnetic measurements. The crystallite sizes were found to decrease with milling time to the nanometer scale (6–14 nm). Milling for 21 h gives rise to a mixture of: (i) a two-bcc α-Fe structure with the same lattice parameter but different microstructural (crystallite size, microstrain) and hyperfine parameters (magnetic field, isomer shift), (ii) Fe 3P nanophase and (iii) a small amount of a paramagnetic FeP phosphide phase, not exceeding 2%. Furthermore, the temperature dependence of the magnetic susceptibility measurement reveals the presence of two magnetic phases with different Curie temperatures, Tc 1 and Tc 2. One Curie temperature is nearly constant (Tc 1 = 867 K) during the milling process, while the other one (Tc 2) is milling time dependent. Annealing at a temperature of 210 °C for half an hour leads to the formation of the FeP phosphide in addition to an α-Fe(P) solid solution and the Fe 3P nanophase.

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