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M. Reissner, E. Bauer, W. Steiner, P. Rogl:
"Mössbauer Effect Study of Eu_0.88Fe₄Sb₁₂ Skutterudite";
Hyperfine Interactions, 158 (2004), 211 - 215.

Mössbauer Effect Study of Eu_0.88Fe₄Sb₁₂ Skutterudite

Michael Reissner 1, Ernst Bauer 1, Walter Steiner 1 and Peter Rogl 2
(1)Institute of Solid State Physics, Vienna University of Technology, Vienna, Austria
(2)Institute of Physical Chemistry, University of Vienna, Vienna, Austria

Abstract
The partly filled skutterudites Eu_0.88Fe₄Sb₁₂ were investigated by ⁵⁷Fe Mössbauer spectroscopy in the temperature range 4.2 K <= T <= 295 K and in external fields up to 13.5 T. The results favour a statistical distribution of Eu and voids in the Fe near neighbour shell. Below 82 ± 1 K magnetic order is present. Debye temperatures Θ_D = 460 ± 20 K and 165 ± 30 K were obtained for Fe with completely occupied Eu sites and for Fe with vacancies in the R-neighbour shell, respectively. The temperature dependence of the quadrupole splitting reflects the thermal expansion of the lattice. The induced hyperfine fields at 4.2 K are negative and differ by roughly a factor of two for the two Fe surroundings.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588057

http://dx.doi.org/10.1007/s10751-005-9035-1