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.

Mössbauer Spectra, Bonding, and Structure In Sn(IV) Acetylacetonates

1974 ◽  
Vol 52 (8) ◽  
pp. 1361-1366 ◽  
Author(s):  
G. M. Bancroft ◽  
T. K. Sham
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Neutral Ligand ◽  
Center Shift ◽  
Mossbauer Spectra ◽  
Bonding Properties ◽  
Mössbauer Parameters

119Sn Mössbauer spectra have been recorded for sixteen acetylacetonates of the type R2–xClxSnL2 (R=Me, Ph; L=anions of acetylacetone or substituted acetylacetone) and Cl4SnHL. The quadrupole splittings have been used to assign stereochemistry for most of these compounds. The good correlation between quadrupole splitting and center shift for the dimethyl analogues shows that there is no appreciable Sn 5s character in the Sn—L bonds. The correlation between [Formula: see text] and center shift for the dimethyl compounds is consistent with the above interpretation, and indicates that changes in [Ψ(0)5s]2 are dominant in determining both the center shift and J values for these compounds. The Mössbauer parameters for the compounds containing a neutral ligand show that the bonding properties of HL are very similar to those of L.The dimethyl compounds all show a pronounced Goldanskii–Karyagin asymmetry in their spectra. The direction of this asymmetry is shown to be consistent with a positive quadrupole splitting for all the dimethyl compounds.

An iodine-127 Mössbauer study of some chalcogen cations of iodine

1982 ◽  
Vol 60 (10) ◽  
pp. 1264-1268 ◽  
Author(s):  
Thomas Birchall ◽  
Ronald D. Myers ◽  
Jack Passmore ◽  
W. A. Shantha Nandana ◽  
George Sutherland
Keyword(s):  
Mössbauer Spectra ◽  
Molecular Compound ◽  
Mössbauer Study ◽  
Mossbauer Spectra ◽  
Cationic Species ◽  
Mössbauer Parameters

The iodine-127 Mössbauer spectra of some chalcogen–iodine cations have been recorded and the Mössbauer parameters are discussed in terms of their known structures. These cations are compared to other cationic species of iodine as well as with a molecular compound of iodine which contains a sulphur–iodine bond.

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.

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.

The Mössbauer spectra of hydroxycarbonate green rusts

Clay Minerals ◽  
1984 ◽  
Vol 19 (1) ◽  
pp. 77-83 ◽  
Author(s):  
E. Murad ◽  
R. M. Taylor
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Paramagnetic State ◽  
Type Structure ◽  
Natural Systems ◽  
Mossbauer Spectra ◽  
Green Rusts ◽  
Cation Arrangement ◽  
Excess Fe

AbstractMössbauer spectra of Fe2+Fe3+ and Fe2+Al hydroxycarbonates taken in the paramagnetic state were fitted using two Fe2+ and Fe3+ doublets each. These spectra can be interpreted in terms of an ordered cation arrangement in the pyroaurite-type structure. The inner Fe2+ doublet seems to be the outcome of excess Fe3+ in the samples studied. The outer Fe2+ doublet (quadrupole splitting ∼2·8 mm s−1, FWHM = 0·26 mm s−1) is relatively well-defined and can, together with the fact that this doublet disappears on oxidation, possibly serve to identify these compounds in natural systems.

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.

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