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Debye temperature and magnetic ordering in K x Ba1−x Fe2S3
Authors:M. Reissner  W. Steiner  J. Wernisch  H. Boller
Affiliation:1. Institut für Festk?rperphysik, Technische Universit?t Wien, 1040, Wien, Austria
2. Institut für Allgemeine und Anorganische Chemie, Universit?t Linz, 4040, Linz, Austria
Abstract:57Fe Mössbauer measurements are reported for the series K x Ba1?x Fe2S3, x ≤ 0.3, at temperatures between 4.2 K ≤ T ≤ 294 K. A decrease of the Debye temperature from 435 to 405 K with x, indicates a weakening of the stiffness of the Fe sublattice. The ordering temperatures, taken from the appearance of magnetic hyperfine splitting in the spectra, are approximately 40 K lower for x ≥ 0.1. The values of the centre shift and the small temperature dependence of the quadrupole splitting strongly supports that similar to the border compound BaFe2S3 also the K containing samples should be characterised as mixed valence compounds.
Keywords:57Fe M?ssbauer measurements  Debye temperature  thioferrates
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