Mössbauer Analyses of FeSiAl Films Sputtered in Ar or 4%N2 Mixture Atmosphere

1991 ◽  
Vol 232 ◽  
Author(s):  
K. Inoue ◽  
M. Tatsumi ◽  
T. Sakata ◽  
S. Tanabe ◽  
T. Ozeki ◽  
...  
Keyword(s):  
Hyperfine Field ◽  
Mössbauer Effect ◽  
Mössbauer Spectra ◽  
Rf Sputtering ◽  
Nearest Neighbors ◽  
Unit Cell ◽  
Mossbauer Effect ◽  
Mossbauer Spectra ◽  
Disordered Structure ◽  
A Site

ABSTRACTMicrostructural differences between sendust(FeSiAl) films sputtered in pure Ar atmosphere and FeSiA1N films sputtered in Ar+4%N2 mixture atmosphere were measured using Mössbauer effect. These films were prepared by a conventional RF sputtering method. As a source for the Mössbauer measurement, 57Co was used.Before annealing, there are no differences between both films in Mössbauer spectra. The both patterns are observed as simple six-line spectra from Fe atoms in a disordered structure. After annealing, both patterns are not simple six-line spectra, which indicate there are more than two types Fe site in the crystal. A tremendous difference between both films appears in the spectra. 95% Fe atoms of FeSiAl film are at the two different sites of D03 structure. However, in FeSiAlN film, only 54& Fe atoms are at the D03 sites and about 30% Fe atoms are at different sites whose hyperfine field is about-250kOe. This value of hyperfine field is expected at a D03-like site with 5 Fe nearest neighbors. This D03-like site is explained as a site that one Fe atom is substituted for one D-site Si or Al atom in a D03 unit cell.No Fe-nitrides were observed in FeSiAlN films.

Study of the interaction of Pu(IV) and Np(IV,V,VI) with Fe hydroxides to predict the behavior of actinides in environmental media

2001 ◽  
Vol 89 (2) ◽  
Author(s):  
M. S. Grigoriev ◽  
A. M. Fedosseev ◽  
A.V. Gelis ◽  
N.A. Budantseva ◽  
V.P. Shilov ◽  
...  
Keyword(s):  
Mössbauer Effect ◽  
Mössbauer Spectra ◽  
Mossbauer Effect ◽  
Environmental Media ◽  
Mossbauer Spectra ◽  
Effect Method

A Mössbauer effect method was used to study the formation of mixed hydroxides in the alkaline coprecipitation of Pu(IV) or Np(IV) with Fe(III). The Mössbauer spectra of mixed

Positive Temperature Dependence of Quadrupole Splittings in Mössbauer Spectra of Fe1.33Nb2.67Se10

2002 ◽  
Vol 57 (6-7) ◽  
pp. 627-630 ◽  
Author(s):  
Takashi Suzuki ◽  
Noriaki Okubo
Keyword(s):  
Temperature Dependence ◽  
Mössbauer Effect ◽  
Mössbauer Spectra ◽  
Positive Temperature ◽  
Mossbauer Effect ◽  
Mossbauer Spectra ◽  
Positive Temperature Dependence ◽  
Low Dimensional

The Mössbauer effect in the low-dimensional compound Fe1.33Nb2.67Se10 has been examined between 78 and 414 K. An anusual positive temperature dependence of the quadrupole splittings was found above 250 K. As a possible origin a mechanism due to π bonding is suggested

Identification of iron-containing impurities in natural kaolinites using the Mössbauer effect

1975 ◽  
Vol 40 (309) ◽  
pp. 89-96 ◽  
Author(s):  
C. S. Hogg ◽  
P. J. Malden ◽  
R. E. Meads
Keyword(s):  
Magnetic Field ◽  
Hyperfine Field ◽  
Mössbauer Effect ◽  
Hyperfine Magnetic Field ◽  
Mossbauer Effect ◽  
X Ray ◽  
Chemical Work ◽  
Superparamagnetic Behaviour ◽  
The Mean ◽  
Mössbauer Data

SummaryTwo clay samples originating in the kaolinized granite area near St. Austell, Cornwall, have been examined by Mössbauer spectroscopy. The iron-containing impurity in the sample with a red discoloration (sample A) has, by measurement of the hyperfine magnetic field, been identified as hematite. In the case of sample B, which was yellow in colour, preliminary Mössbauer work indicated β-FeOOH as the impurity, but detailed measurements of hyperfine field and Nöel temperature, when compared with similar results for a synthetic β-FeOOH sample, suggested otherwise. X-ray and chemical work suggested that the iron-containing phase in sample B is goethite, α-FeOOH in which some substitution of Al+3 for Fe3+ has occurred; the Mössbauer data are consistent with this conclusion. Both clay samples exhibited superparamagnetic behaviour and this has been utilized to obtain rough estimates of the mean radius of the particles of the iron-containing impurity. These were 117 Å for the α-Fe2O3 in sample A and 270 Å for aluminian α-FeOOH in sample B.

scholarly journals Variation of Quadrupole Splitting in Modified Oxyhemoglobin: A Mössbauer Effect Study

2000 ◽  
Vol 55 (1-2) ◽  
pp. 193-198 ◽  
Author(s):  
M. I. Oshtrakh ◽  
O. B. Milder ◽  
V. A. Semionkin ◽  
A. L. Berkovsky ◽  
M. A. Azhigirova ◽  
...  
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Effect Study ◽  
Heme Iron ◽  
Mossbauer Effect ◽  
Frozen Solution ◽  
Mossbauer Spectra ◽  
Human Adult ◽  
Adult Hemoglobin ◽  
Α And Β Subunits

Human adult hemoglobin modified by both pyridoxal-5'-phosphate and glutaraldehyde in the oxy-form was studied by Mössbauer spectroscopy. Mössbauer spectra were measured at 87 and 295 K (hemoglobin in lyophilized form) and at 87 K (hemoglobin in frozen solution). The values of the quadrupole splitting for modified oxyhemoglobin were found to be lower then those of oxyhemoglobin without modifications in lyophilized form and frozen solution, respectively. The Mössbauer spectra of modified oxyhemoglobin were also analyzed in terms of the heme iron inequivalence in α-and β-subunits of the tetramer. Differences of the tendencies of temperature dependencies of quadrupole splitting for modified and non-modified oxyhemoglobin in lyophilized form were shown.

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