Interpretation of the ζ-Holmium Sesquiselenide Magnetic Susceptibility

  • L. Pawlak
  • M. Duczmal
  • S. Pokrzywnicki


The magnetic properties of the heavier lanthanide sesquiselenides were studied as early as 1937 by Klemm and Koczy 1 and later in the 1970’s by a group of Soviet investigators2,3. The measurements were carried out down to liquid nitrogen temperature, and they gave linear plots of the temperature dependence of the reciprocal magnetic susceptibility. The widening of the measurement range down to helium temperatures makes a more detailed interpretation of magnetic properties possible, relating magnetic susceptibility to crystal field effects. Such an analysis becomes simplest in the case of compounds with a high symmetry of the magnetic ion environment. This is the reason for our interest in sesquiselenides with the Sc2S3 crystal structure, since they are the ones which demonstrate an octahedral environment of metal ions. The orthorhombic Sc2S3 structure arises from the NaCl structure by removing 1/3 of the cations in an ordered manner. The first coordination sphere of each metal ion contains six selenide ions forming a slightly distorted octahedron. The deviations of the lattice constant ratios a/b and c/b from their ideal values, being equal to $\sqrt{2}$ and 3 respectively, can be taken as a measure of that distortion.


Magnetic Susceptibility Crystal Field Ground Term Distorted Octahedron Crystal Field Parameter 
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Copyright information

© Plenum Press, New York 1982

Authors and Affiliations

  • L. Pawlak
    • 1
  • M. Duczmal
    • 1
  • S. Pokrzywnicki
    • 1
  1. 1.Institute of Inorganic Chemistry and Metallurgy of Rare ElementsTechnical UniversityWrocław50-370Poland

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