Intramolecular rotations and electronic states of iron in the iron bis(dicarbollide) complex Fe[(C2B9H11)2] studied by a 57Fe nuclear probe and computational methods

2021 ◽  
Author(s):  
Katarzyna Bednarska-Szczepaniak ◽  
Katarzyna Dziedzic-Kocurek ◽  
Ewelina Przelazły ◽  
Jan Stanek ◽  
Zbigniew Jan Lesnikowski
Keyword(s):  
Mössbauer Spectroscopy ◽  
Computational Methods ◽  
Room Temperature ◽  
Mossbauer Spectroscopy ◽  
Electronic States ◽  
Mößbauer Spectroscopy

Mössbauer spectroscopy of iron(III)bis(dicarbollide) (1) and its adduct (2) revealed low spin FeIII in 1 and supprasingly FeII in 2. In 1 the (C2B9H11) rotate at room temperature with 107...

MÖssbauer Study of a Tinife Shape Memory Alloy.

1991 ◽  
Vol 246 ◽  
Author(s):  
M. Jimenez ◽  
V. Marquina ◽  
S. Aburto ◽  
M.L. Marquina ◽  
R. Gomez ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Shape Memory ◽  
Room Temperature ◽  
Mossbauer Spectroscopy ◽  
Density Wave ◽  
Quadrupole Doublet ◽  
Mössbauer Study ◽  
Scanning Calorimetry ◽  
Mößbauer Spectroscopy ◽  
Wave Induced

AbstractMÖssbauer spectroscopy is very sensitive to structural transitions that may occur during a phase change of the type known to arise in the shape memory TiNiFe alloy. In this work we present the results of resistance vs temperature, differential scanning calorimetry (DSC) and Mössbauer spectroscopy (MS) measurements in Ti50Ni47Fe3 sample. The resistance vs temperature curve shows the usual sharp increase associated to the B2 → R transition at Tp = 245 K and then raises until a maximum is attained at ∼ 150 K. The DSC curve shows a peak maximum at the same temperature where the resistivity starts to increase. The room temperature Mössbauer spectrum consists of a single line, indicating that the iron atoms have cubic surroundings. As temperature is lowered, a small asymmetric quadrupole doublet begins to develop. The isomer shift (I.S.) and quadrupole splitting (ΔQ) values of this doublet increase with decreasing temperature until almost constant values are achieved at temperatures ∼ 100 K. We relate the changes in the Mössbauer spectra with previously proposed charge density wave induced premartensitic transition.

Silicide Formation at Fe-Si Interfaces Studied by Mössbauer Spectroscopy and Rutherford Backscattering

1980 ◽  
Vol 3 ◽  
Author(s):  
R. L. Cohen ◽  
L. C. Feldman ◽  
K. W. West ◽  
P. J. Silverman
Keyword(s):  
Mössbauer Spectroscopy ◽  
Room Temperature ◽  
Mossbauer Spectroscopy ◽  
Rutherford Backscattering ◽  
Silicide Formation ◽  
Substrate Preparation ◽  
Surface Sensitivity ◽  
Mößbauer Spectroscopy ◽  
Natural Iron ◽  
Enhanced Surface

EXTENDED ABSTRACTWe have deposited the Mössbauer isotope Fe 57 on (111) Si surfaces at room temperature and measured the Mössbauer spectrum using conversion electron Mössbauer spectroscopy for enhanced surface sensitivity. Samples were examined as a function of substrate preparation and thermal anneal. Rutherford backscattering was used to monitor sample preparation. The Fe 57 layers have been coated with natural iron (2.2% Fe 57) or silver to prevent them from oxidizing when exposed to air. The known distinctive Mössbauer spectra of Fe, FeSi, FeSi 2 , Fe in Si, and Si in Fe allows the identification of these phases in the samples.

scholarly journals Structure and hyperfine interactions in multiferroic Aurivillius Bim+1Ti3Fem−3O3m+3 compounds prepared by mechanical activation

2014 ◽  
Vol 32 (4) ◽  
pp. 676-681 ◽  
Author(s):  
Mariusz Mazurek ◽  
Dariusz Oleszak ◽  
Dionizy Czekaj
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mechanical Activation ◽  
Room Temperature ◽  
Mossbauer Spectroscopy ◽  
Hyperfine Interactions ◽  
Activation Process ◽  
X Ray Diffraction ◽  
Aurivillius Phases ◽  
X Ray ◽  
Mößbauer Spectroscopy

AbstractThe aim of the study was to determine the structure and hyperfine interactions of Bim+1Ti3Fem−3O3m+3 multiferroic Aurivillius compounds prepared by mechanical activation process. X-ray diffraction and Mössbauer spectroscopy were applied as complementary methods. After the process of mechanical milling, desired Aurivillius phases were not formed, thus, thermal treatment needed to be applied. Heating the product of mechanical activation up to 993 K allowed to obtain Aurivillius phases with relatively large amount of non-reacted hematite. However, after the material was annealed at an elevated temperature of 1073 K, the content of not fully synthesized hematite was significantly reduced. Mössbauer spectroscopy confirmed that Aurivillius compounds remain in paramagnetic state at room temperature.

The effect of pressure on the electronic states of FeS and studied by Mössbauer spectroscopy

1997 ◽  
Vol 9 (2) ◽  
pp. 515-527 ◽  
Author(s):  
Hisao Kobayashi ◽  
Masaki Sato ◽  
Takashi Kamimura ◽  
Masamichi Sakai ◽  
Hideya Onodera ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Electronic States ◽  
Effect Of Pressure ◽  
Mößbauer Spectroscopy

The Mössbauer Spectrum of Illite

Clay Minerals ◽  
1994 ◽  
Vol 29 (1) ◽  
pp. 1-10 ◽  
Author(s):  
E. Murad ◽  
U. Wagner
Keyword(s):  
Mössbauer Spectroscopy ◽  
Quadrupole Splitting ◽  
Iron Oxides ◽  
Room Temperature ◽  
Mossbauer Spectroscopy ◽  
Paramagnetic Relaxation ◽  
Mossbauer Spectrum ◽  
Mößbauer Spectroscopy ◽  
Two Samples ◽  
Fe Sites

AbstractEight illites were studied by Mössbauer spectroscopy at room temperature and 4.2 K. On the basis of their Fe contents, these illites can be divided into an Fe-rich (>5 wt% Fe) and an Fe-poor (<1 to ∼3 wt% Fe) group. Mössbauer spectroscopy showed that the Fe-rich illites had lower proportions of divalent Fe than their Fe-poor counterparts. Slow paramagnetic relaxation was observed in the Fe-poor illites and must be accounted for when fitting the spectra. Two samples contained iron oxides that were superparamagnetic and thus, although contributing to the Fe3+ doublets, escaped detection at room temperature. Structural Fe3+ had a temperature-independent quadrupole splitting that was lower for the Fe-rich illites (0.59 mm/s) than that of the Fe-poor illites (0.73 mm/s). The Fe2+ quadrupole splittings were higher at 4.2 K than at room temperature, but the Fe-rich illites again had lower Fe2+ quadrupole splittings both at room temperature (2.69 vs. 2.88 mm/s) and at 4.2 K (2.96 mm/s vs. 3.08 mm/s). Distinction of Fe sites in the illites with cis- and trans-OH coordination was not possible. The presence of tetrahedral Fe3+ was observed only in the most Fe-rich sample (8.4 wt% Fe).

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