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.

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.

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.

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.

Mössbauer studies in transition metal chemistry. IV. Iron(II) complexes of 2-(2'-Pyridyl)benzimidazole

1978 ◽  
Vol 31 (3) ◽  
pp. 487 ◽  
Author(s):  
RL Martin ◽  
IAG Roos ◽  
DML Goodgame ◽  
AASC Machado
Keyword(s):  
Temperature Dependence ◽  
Mössbauer Spectra ◽  
Spin Crossover ◽  
Complex Cation ◽  
Octahedral Symmetry ◽  
Line Lattice ◽  
Metal Chemistry ◽  
Mossbauer Spectra ◽  
Iv Iron ◽  
Mössbauer Parameters

Mossbauer spectra of a number of compounds containing the [Fe(pyb)3]2+ complex cation [pyb, 2-(2'-pyridyl)benzimidazole] confirm that these compounds undergo a change of spin state with temperature consistent with a 5T2-1A1 spin crossover. The nature of the Mossbauer spectra and their temperature-dependence are sensitive to the associated anion and the method of preparation. ��� The temperature-dependence of the Mossbauer parameters has been used to derive information about the distortions from octahedral symmetry and it is concluded that the dimensions of the crystal-line lattice are changing slightly with temperature.

scholarly journals Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, III Röntgenographische und Mößbauer-spektroskopische Untersuchung des Spinellsystems ZnFeVO4-Fe3O4 / Distribution and Valence of the Cations in Spinel Systems with Iron and Vanadium, III X-ray Investigation and Mössbauer Spectra of the Spinel System ZnFeVO4-Fe3O4

1981 ◽  
Vol 36 (10) ◽  
pp. 1228-1233 ◽  
Author(s):  
Erwin Riedel ◽  
Hümeyra Anik ◽  
Till Dützmann
Keyword(s):  
Mössbauer Spectra ◽  
X Ray ◽  
Lattice Constants ◽  
Mossbauer Spectra ◽  
Mössbauer Parameters ◽  
Spinel System

Abstract The spinel system Zni_zFe2:[Fei+2;Vi_I]04 has been prepared by heating mixtures of ZnFeV(>4 and Fe3Ü4 at 1000 °C. The lattice constants, the oxygen parameters and the Mössbauer parameters show that a transition from a nearly normal to an inverse distribu-tion of Fe(II) and Fe(III) exists.

119Sn Mössbauer Spectra of Sn–Ni Compounds

1975 ◽  
Vol 53 (2) ◽  
pp. 307-310 ◽  
Author(s):  
G. Michael Bancroft ◽  
K. David Butler
Keyword(s):  
Transition Metal ◽  
Mössbauer Spectra ◽  
Solvent Molecule ◽  
Mossbauer Spectra ◽  
Nickel Compounds ◽  
Mössbauer Parameters ◽  
Solvent Molecules

Sn Mössbauer spectra have been recorded for eleven tin-nickel compounds of the type Clx,Sn[NiLCp]4−x (L = CO, PPh3;x = 2,3) and Cl3SnNiL2Cp.S (S = solvent molecule). The center shifts are used to distinguish coordinated SnCl3 and uncoordinated ionic SnCl3−, respectively. In the SnCl3− compounds, the Mössbauer parameters indicate that the solvent molecules are not bonded to the Sn atom. In compounds containing Sn—Ni bonds, the center shifts and quadropole splittings show that Ni(PPh3)Cp is the best donor of the first row transition metal moieties, and that the Sn—Ni bond has the highest Sn s character. Ni(CO)Cp is a slightly poorer donor than Ni(PPh3)Cp, and the Sn—Ni bond has a smaller s character.

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.

Studies of the orthoamphiboles. IV. Mössbauer spectra of anthophyllites and gedrites

1989 ◽  
Vol 53 (370) ◽  
pp. 181-191 ◽  
Author(s):  
Anthony D. Law
Keyword(s):  
Mössbauer Spectra ◽  
Single Model ◽  
Mossbauer Spectra ◽  
Mössbauer Parameters

AbstractFitted Mössbauer spectra are presented for a set of anthophyllites and gedrites. Despite their complexity it is possible to obtain fits for gedrite spectra and the Mössbauer parameters are consistent with results for anthophyllites from this and previous studies. At least three doublets are required to fit the Fe2+absorption in gedrites; there is no single model at present to explain the behaviour of the spectra. Fe3+absorption is also resolved.

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