Debye temperature and magnetic ordering in KxBa1-xFe2S3
Sprache des Titels:
57Fe Moessbauer measurements are reported for the series KxBa1-xFe2S3, x  0.3, at temps. between 4.2 K  T  294 K. A decrease of the Debye temp. from 435-405 K with x, indicates a weakening of the stiffness of the Fe sublattice. The ordering temps., taken from the appearance of magnetic hyperfine splitting in the spectra, are .apprx.40 K lower for x  0.1. The values of the center shift and the small temp. dependence of the quadrupole splitting strongly supports that similar to the border compd. BaFe2S3 also the K contg. samples should be characterized as mixed valence compds.