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NMR and Mössbauer Studies of the Amorphous System Fe79P21-xBx

  • K. Raj
  • A. Amamou
  • J. Durand
  • J. I. Budnick
  • R. Hasegawa

Abstract

Combined NMR, spin-echo and Mössbauer experiments have been performed to obtain hyperfine field distributions of the transition metal and metalloid elements in splat-cooled amorphous Fe79P21-xBx alloys. These distributions are related to the local environments of the elements. The NMR signals are observed in the low frequency range 20 – 60 MHz and all the nuclei, i.e. Fe, P and B, may contribute to the spectral distribution. The resolution of the spectra into that due to Fe and (P + B) nuclei was made possible by using samples prepared with an Fe56 isotope. The Fe distribution thus obtained shows general agreement with the Mössbauer field distribution. From a careful analysis of the NMR data, the hyperfine field at the B nuclei in these amorphous alloys is found to range from 24 to 26 KG increasing with B content. An upper limit of 8 KG for the half-width is attributed to this distribution.

The Mössbauer spectra of the Fe57 nuclei resemble those for the crystalline Fe75P25−xBx alloys. A fit of our spectra shows a field distribution which suggests the presence of structure. Such a structure may correspond to various Fe sites, also seen in the crystalline alloys. The distributions, generally lie between about 160 and 330 KG, with a maximum at about 260 KG. These spectra do not show the presence of Fe nuclei with essentially zero hyperfine field as was obtained for amorphous Fe-Pd-P by Sharon et al. and for amorphous Fe-P by Logan et al. With increasing B content the center of gravity of the Fe distribution shifts to higher values. From a systematic study of the NMR lines and other considerations it is concluded that the P field distribution is broad and its hyperfine field is between 20 and 35 KG for the higher P concentration alloys.

Keywords

Field Distribution Amorphous Alloy Hyperfine Field Fe57 Nucleus Mossbauer Spectrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • K. Raj
    • 1
  • A. Amamou
    • 2
  • J. Durand
    • 2
  • J. I. Budnick
    • 3
  • R. Hasegawa
    • 4
  1. 1.Yale UniversityNew HavenUSA
  2. 2.Calif. Inst. of Tech.PasadenaUSA
  3. 3.University of ConnecticutStorrsUSA
  4. 4.Allied Chemical Corp.MorristownUSA

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