Crystal structure and Mössbauer studies of the isotypic Fe6-cluster compounds RE15[Fe8C25], RE=Dy, Ho
Bambar DavaasurenEnkhtsetseg DashjavGuido KreinerHorst BorrmannSven-Ulf WeberK. D. BeckerF. J. LitterstRüdiger Kniep
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Mössbauer Effect of Ferromagnetic Intermetallic Compounds in Iron-Germanium System: Fe3Ge and Fe5Ge3
The hyperfine fields for an Fe atom in ferromagnetic intermetallic compounds. Fe 3 Ge and Fe 5 Ge 3 , have been investigated by using the Mössbauer effect. The hyperfine fields at a given Fe site of ε 1 and ε phases in Fe 3 Ge were nearly equal to each other in spite of the difference in the environment beyond second neighbours which affected their Curie temperatures. The hyperfine field on 2(a) site of Fe 5 Ge 3 is 136KOe which is unexpectedly small in comparison with the neutron diffraction data by Katsuraki. The hyperfine field on 2(d) site has two values (214KOe and 256KOe) which suggests the existence of two magnetic sublattices associated with this site.
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Quadrupole splitting
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The recently synthesized Au(V) complex fluorides of the form A+ AuF6− with A = Xe2F11+, XeF5+, and Cs+ have been studied by Mössbauer spectroscopy with the 77.3 keV gamma resonance of 197Au. The values obtained for isomer shift and electric quadrupole interaction are in harmony with the assigned oxidation state Au(V), as well as with the octahedral shape of the AuF6− anion.
Quadrupole splitting
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This book reviews some of the uses of the Mossbauer effect. Topics considered include gamma resonance revisited: temporal aspects of absorption and scattering; relaxation spectra in Mossbauer spectroscopy; dynamics of proteins; metals and alloys: amorphous metals; coherent transients in Mossbauer spectroscopy; the study of radiation phenomena in solids by Mossbauer technique and related methods; Mossbauer emission spectroscopy and after-effects of nuclear transformations; and structure and properties of magnetic alloys.
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In order to study the local environment effect, measurements of the Mössbauer effect of Fe 57 were made for Ni 79.5 Fe 20.5 , Ni 75.4 Fe 24.6 and Ni 69.7 Fe 30.3 alloys with various degrees of long range order. We have analysed the Mössbauer pattern with 7 or 8 configurations without any assumption of the functional relation between the hyperfine field and the number of Fe atoms in the nearest neighbor shell and determined the value of the hyperfine field for each environment from which the values of the magnetic moment on Fe atoms could be deduced in a self-consistent way. The results show that the variations of the hyperfine field and the magnetic moment are not linear, especially for highly ordered alloys. This behavior is discussed in terms of the cluster CPA theory.
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It has been found in investigating the Mossbauer effect in tin-organic compounds that singlet Mossbauer lines appear in compounds with four identical substituents (SnCl/sub 4/, Sn (C/sub 6/H/sub 5/)/sub 4/) whereas if different substituents (R/sub i/Sn X/sub 4 -i/) are present in the molecule a very strong doublet splitting of the Mossbauer lines occurs (the two peaks sometimes being different in intensity and width). The Mossbauer effect has been observed in amorphous media (tin containing glass) for the first time. Some data are obtained which indicate that the decisive factor determining the shape of the Mossbauer spectra (isomer shift and quadrupole splitting) are the molecular bonds closest to the tin nuclei. (auth)
Quadrupole splitting
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