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.

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.

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.

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.

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 Investigation of Magnetic Ordering in RCo12B6 (R = Y, Nd) by 57Fe Mössbauer Spectroscopy

1993 ◽  
Vol 46 (5) ◽  
pp. 679 ◽  
Author(s):  
JM Cadogan ◽  
SJ Campbell ◽  
XL Zhao ◽  
E Wu
Keyword(s):  
Basal Plane ◽  
Room Temperature ◽  
Mössbauer Spectra ◽  
57Fe Mössbauer Spectroscopy ◽  
Magnetic Ordering ◽  
Spin Reorientation ◽  
57Fe Mössbauer ◽  
Mossbauer Spectra ◽  
57Fe Mossbauer Spectroscopy ◽  
Increasing Temperature

Mossbauer spectra of YC012B6 and NdCo12B6 doped with enriched 57Fe have been obtained at various temperatures between 4�2 K and room temperature. The spectrum of YC012B6 at 4�2 K indicates that the Co sublattice orders in the crystallographic basal plane. NdCo12B6 orders along or close to the crystallographic c-axis at 4�2 K and undergoes a spin-reorientation with increasing temperature until at ~55 K the magnetisation lies in or near the basal plane.

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.

Mixed oxidation state compounds of antimony: a 121Sb Mössbauer study of some antimony–fluorine systems

1978 ◽  
Vol 56 (18) ◽  
pp. 2417-2421 ◽  
Author(s):  
Jack G. Ballard ◽  
Thomas Birchall ◽  
Ronald J. Gillespie ◽  
Edward Maharajh ◽  
David Tyrer ◽  
...  
Keyword(s):  
Oxidation State ◽  
Mössbauer Spectra ◽  
Mössbauer Study ◽  
Mossbauer Spectra ◽  
Mixed Oxidation ◽  
Mössbauer Data

Antimony-121 Mössbauer spectra for [Sb2F42+][SbF6−]2 and three compounds containing the [Sb3F14−] ion are reported. The Mössbauer data are discussed in relation to their known structures. Two of the compounds give spectra which, on analysis, give η values of unity.

Asymmetry in the 125Te Mössbauer Spectra of Tellurium Thiourea Complexes: Sign of the Nuclear Quadrupole Moment of the 3/2 State

1974 ◽  
Vol 52 (4) ◽  
pp. 564-569 ◽  
Author(s):  
B. M. Cheyne ◽  
C. H. W. Jones
Keyword(s):  
Excited State ◽  
Single Crystal ◽  
Quadrupole Moment ◽  
Crystal Orientation ◽  
Mössbauer Spectra ◽  
Negative Sign ◽  
Mossbauer Spectra ◽  
Orientation Effects ◽  
Nuclear Quadrupole Moment ◽  
Nuclear Quadrupole

Asymmetry in the Mössbauer spectra of Te(II) thiourea complexes is shown to be due predominantly, if not exclusively, to single crystal orientation effects. The asymmetry in TeTu4Cl2•2H2O is consistent with a negative sign for the nuclear quadrupole moment of the [Formula: see text] excited state in 125Te.

A125Te Mössbauer study of hexahalotellurates, pentahalotellurates, and tetrahaloaryltellurates

1981 ◽  
Vol 59 (6) ◽  
pp. 913-917 ◽  
Author(s):  
Nigel S. Dance ◽  
Pablo Dobud ◽  
Colin H. W. Jones
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Additive Model ◽  
Single Line ◽  
Mössbauer Study ◽  
Mossbauer Spectra ◽  
Mössbauer Parameters

The 125Te Mössbauer spectra of a number of hexahalotellurates have been measured and no significant effects of the size or symmetry of the cation on the Mössbauer parameters were observed. The mixed hexahalotellurates, M2TeX4Y2 (X, Y = Cl, Br, or I), do not exhibit a quadrupole splitting, Δ, and the trends in δ with variation in X and Y are discussed. The pentahalotellurates MTeCl5, MTeBr5, and MTeBr4Cl also yield single line spectra and this is interpreted as evidence of intermolecular bridging. The tetrahaloaryltellurates MArTeX4 and MArTeX3Y (X, Y = Cl, Br, or I) have been studied and the trends in Δ with variation X and Y are consistent with an additive model. The trends in δ are more complex.

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