Some remarks on a recent Mössbauer effect study of the β-phase iron germanide

1976 ◽  
Vol 54 (18) ◽  
pp. 1850-1853 ◽  
Author(s):  
G. A. Fatséas
Keyword(s):  
Computer Analysis ◽  
Binomial Distribution ◽  
Mössbauer Spectra ◽  
Effect Study ◽  
Iron Site ◽  
Mossbauer Effect ◽  
Mössbauer Study ◽  
Mossbauer Spectra ◽  
Β Phase ◽  
Line Iron

A Mössbauer study of iron germanide was published recently in this journal (Daniels, Moore, and Panda). The authors reported that they reproduced, by computer analysis, their Mössbauer spectra in terms of three six-line iron sites, rejecting our earlier results of several FeI and FeII sites identified from a model of statistical (binomial) distribution of vacancies on the iron-site positions (Fatséas, Dormann, and Brossard). We would like, in this paper, to make some remarks and also to present some of our unpublished results for eventual future discussions.

A Mössbauer study of a single crystal of the β phase of iron–germanium

1982 ◽  
Vol 60 (11) ◽  
pp. 1564-1572
Author(s):  
J. M. Daniels ◽  
H. Y. Lam ◽  
P. L. Li
Keyword(s):  
Single Crystal ◽  
Basal Plane ◽  
Mössbauer Spectra ◽  
Antiferromagnetic State ◽  
Mössbauer Study ◽  
Mossbauer Spectra ◽  
Narrow Angle ◽  
Β Phase ◽  
Line Patterns

57Fe Mössbauer spectra were obtained by scattering in a narrow angle geometry from a face, containing the basal plane, of a single crystal of the hexagonal β phase Fe1.67 Ge. Spectra were also obtained from a source of 57Co diffused into an a–c face of a single crystal of this alloy. In all cases, the spectra were satisfactorily resolved into three six-line patterns, and measurements of the relative intensities of the lines indicate that the antiferromagnetic state has a canted structure with all the spins lying in the basal plane.

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.

A Mössbauer Study of the β Phase of Iron–Germanium

1975 ◽  
Vol 53 (21) ◽  
pp. 2428-2437 ◽  
Author(s):  
J. M. Daniels ◽  
F. E. Moore ◽  
S. K. Panda
Keyword(s):  
Mössbauer Spectra ◽  
Full Range ◽  
Mössbauer Study ◽  
Mossbauer Spectra ◽  
Β Phase ◽  
Occupation Numbers ◽  
Easy Direction ◽  
Fe Sites ◽  
Line Patterns ◽  
Phase Spectra

Measurements have been made of the Mössbauer spectra of 5 samples of the β phase of iron–germanium, covering the full range of composition, Fel+yGe (1/2 ≤ y ≤ 1), of this phase. Spectra were taken for both randomly oriented powders and also powders with the grains oriented with an easy direction of magnetization perpendicular to the plane of the absorber. The spectra resolved into 3 six-line patterns, indicating 3 inequivalent Fe sites. The occupation numbers and canting angles of each site were measured and the spins localized on each site were deduced to be 1/2, 2, and 2. The structure of this phase is discussed in the light of these observations.

scholarly journals Mössbauer study of Fe phases in terrestrial olivine basalts from southern Egypt

Mineralogia ◽  
2013 ◽  
Vol 44 (1-2) ◽  
pp. 3-12 ◽  
Author(s):  
Kamaleldin M. Hassan ◽  
Julius Dekan
Keyword(s):  
Optical Microscopy ◽  
Crystal Chemistry ◽  
Mössbauer Spectra ◽  
Mossbauer Spectroscopy ◽  
X Ray Diffraction ◽  
Mössbauer Study ◽  
Hyperfine Parameters ◽  
X Ray ◽  
Mossbauer Spectra ◽  
Oxidized Iron

AbstractOlivine basalts from southern Egypt were studied by 57Fe Mössbauer spectroscopy at 297 and 77 K, and by optical microscopy and X-ray diffraction. The 57Fe Mössbauer spectra show three-magnetic sextets, three doublets of ferrous (Fe2+), and a weak ferric (Fe3+) doublet that is attributable to a nanophase oxide (npOx). The magnetic sextets relate to titanomagnetite and the Fe2+ doublets to olivine, pyroxene, and ulvöspinel. Variations in the hyperfine parameters of the various Fe components are attributed to changes in the local crystal chemistry. The intensity of oxidation (Fe3+/ΣFe) in the rocks varies from 20-27% with the oxidized iron largely residing in the titanomagnetite.

Computer analysis of Mössbauer spectra

1971 ◽  
Vol 2 (6) ◽  
pp. 322-330 ◽  
Author(s):  
B.L. Chrisman ◽  
T.A. Tumolillo
Keyword(s):  
Computer Analysis ◽  
Mössbauer Spectra ◽  
Mossbauer Spectra

Mössbauer study of glauconites from Poland

Clay Minerals ◽  
1981 ◽  
Vol 16 (3) ◽  
pp. 221-230 ◽  
Author(s):  
A. Kotlicki ◽  
J. Szczyrba ◽  
A. Wiewióra
Keyword(s):  
Mössbauer Spectra ◽  
Mössbauer Study ◽  
Mossbauer Spectra

AbstractFour bands occur in the Mössbauer spectra of pelletal glauconites ranging in age from Cambrian to Oligocene. Components due to Fe3+ in the cis M(2) positions are visible in all the spectra but their shapes depend on the expanding layer content. In the spectrum of the Oligocene glauconite a very well-developed shoulder due to Fe2+ in the trans M(1) positions is observed. In the younger glauconites (15–20% expanding layers) the conventional assignments of the spectra indicate that Fe2+ occupies the trans M(1) positions, the cis M(2) positions being vacant. Conversely, in the Palaeozoic samples (~5% expanding layers) the cis occupancy significantly prevails over trans occupancy.

scholarly journals Mössbauer study of treated Nd2Fe14B

Nukleonika ◽  
2015 ◽  
Vol 60 (1) ◽  
pp. 7-10 ◽  
Author(s):  
Mieczysław Budzyński ◽  
Virgil C. Constantin ◽  
Ana-Maria J. Popescu ◽  
Zbigniew Surowiec ◽  
Tamara M. Tkachenka ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Grain Boundaries ◽  
Mössbauer Spectra ◽  
Mossbauer Spectroscopy ◽  
Main Phase ◽  
Surface Material ◽  
Mössbauer Study ◽  
Water Solutions ◽  
Mossbauer Spectra ◽  
Neodymium Magnets

Abstract The Nd2Fe14B cylindrical magnets were treated with water solutions of alkali, acid, and salt. Mössbauer spectroscopy was applied to study the composition and properties of the surface material of the treated magnets. It is shown that the main phase of the permanent Nd2Fe14B magnet partly decomposes. The released α-Nd at the grain boundaries interacts with water and forms neodymium hydroxide matrix, and the released Fe diffuses into it. The presence of Fe-Nd(OH)3 is reflected in the paramagnet doublet in the Mössbauer spectra of treated neodymium magnets.

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

Computer analysis of mössbauer spectra

1984 ◽  
Vol 35 ◽  
pp. C-100
Author(s):  
B.L. Chrisman ◽  
T.A. Tumolillo
Keyword(s):  
Computer Analysis ◽  
Mössbauer Spectra ◽  
Mossbauer Spectra
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