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Mössbauer study of Li0.5Fe2.5−x Al x O4: cation distribution and noncollinear spin alignment

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Abstract

Based on57Fe Mössbauer spectroscopic investigations of Li0.5Fe2.5−x Al x O4 (x=0.3 and 0.8) conducted at 4.2 K under an external magnetic field of 40 kG, the exact cation distribution has been worked out. Both the compositions show spin canting for the octahedral sites, with the Yaffet Kittle angle αyk≃20° forx=0.3 and αyk≃27° forx=0.8. The Al3+ ions show some preference for the octahedral sites but the derived cation distribution is quite different from that reported earlier on the basis of magnetization studies. The reported compensation temperature forx=0.8 has not been observed. The origin of the central quadrupole doublet along with the magnetic sextet and the role of canted spin alignment towards the possible observance of compensation point, are discussed.

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Authors and Affiliations

  1. Chemistry Division, Bhabha Atomic Research Centre, 400 085, Bombay, India

    S. K. Kulshreshtha

  2. Physikalische Institut Abt II, Universitat Erlangen Nurnberg, Gluck Strasse 10, D-8520, Erlangen, West Germany

    G. Ritter

Authors
  1. S. K. Kulshreshtha
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  2. G. Ritter
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Kulshreshtha, S.K., Ritter, G. Mössbauer study of Li0.5Fe2.5−x Al x O4: cation distribution and noncollinear spin alignment. J Mater Sci 20, 821–826 (1985). https://doi.org/10.1007/BF00585721

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  • DOI: https://doi.org/10.1007/BF00585721

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