7.1.2.4 Hyperfine parameters

2005 ◽  
pp. 73-76
Author(s):  
E. Burzo
Keyword(s):  
Hyperfine Parameters

Relativistic Calculation of Hyperfine Parameters of Mercury Compounds

2014 ◽  
Vol 3 (3) ◽  
pp. 284-290 ◽  
Author(s):  
Michael Filatov ◽  
Wenli Zou ◽  
Dieter Cremer
Keyword(s):  
Hyperfine Parameters ◽  
Mercury Compounds ◽  
Relativistic Calculation

scholarly journals EPR Spectroscopy Investigation of Cu2+Ions Adsorbed in Tannin-Formaldehyde Resins of Mimosa (Acacia mearnsii) Bark Extracts

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Marcelo H. Herbst ◽  
Ney V. Vugman
Keyword(s):  
Spectral Resolution ◽  
Epr Spectroscopy ◽  
Chemical Environment ◽  
Broad Line ◽  
Hyperfine Parameters ◽  
Acacia Mearnsii ◽  
Polymeric Network ◽  
Coordination Sites ◽  
Reversible Formation

The chemical environment of Cu2+ions adsorbed in tannin-formaldehyde resins ofAcacia mearnsiibark extracts, prepared from polybutene, is investigated by EPR spectroscopy at 300 K. The spectrum is simulated considering two isolated axial Cu(II) species (Species 1:A∥=16.50(5) mT,A⊥=1.20(10) mT,g∥=2.28(1), andg⊥=2.08(1); Species 2:A∥=15.00(5) mT,A⊥=1.50(10) mT,g∥=2.32(1), andg⊥=2.05(2)), superposed to a broad line (giso=2.14(1); linewidth = 30.0(5) mT) assigned to Cu(II) aggregates. Measurements at 77 K did not improve spectral resolution. Heating at 413 K changes the hyperfine parameters of Species 2 (A∥=14.20(5) mT,A⊥=1.20(10) mT,g∥=2.33(1), andg⊥=2.07(2)) and slightly modifies the parameters of the broad line (giso=2.11(2); linewidth = 40.00(50) mT) but does not change Species 1, assigned to Cu(II) species immobilized into resin pores in cathecolate-type coordination sites. Species 2 is assigned to Cu(II) species immobilized at the outer resin surface. Upon extended heating, a reversible formation of semiquinone-type paramagnetic radicals (giso=2.0037(1)) is observed, assigned to the partial collapse of the resin polymeric network.

Structure, Magnetic Properties and Hyperfine Parameters of Nd-Substituted Ni-Fe-Ga Heusler Alloys

MRS Advances ◽  
2017 ◽  
Vol 2 (25) ◽  
pp. 1341-1346
Author(s):  
Monica Sorescu ◽  
Felicia Tolea ◽  
Mihaela Valeanu ◽  
Mihaela Sofronie
Keyword(s):  
Melt Spinning ◽  
Magnetic Measurements ◽  
Heusler Alloys ◽  
Hyperfine Magnetic Field ◽  
Rapid Quenching ◽  
Linear Least Squares ◽  
X Ray Diffraction ◽  
Hyperfine Parameters ◽  
X Ray ◽  
Field Distributions

ABSTRACTSamples of Ni57-xNdxFe18Ga25 with x=2 and 4 were prepared in ribbon form by rapid quenching via melt spinning route. The samples were analyzed by X-ray diffraction (XRD), magnetic measurements and Mössbauer spectroscopy, both in the as-quenched form and after thermal annealing at 900 oC for 2 min and 400 °C for 2 hours. For x=2 the Nd atoms are completely dissolved in the Ni-Fe-Ga matrix, while for x=4 the additional occurrence of the secondary 2:17 phase could be resolved. These findings were supported by the analysis of hyperfine magnetic field distributions obtained from the non-linear least-squares fitting of the Mössbauer spectra.

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.

Spin glass transition and hyperfine parameters in FeO-Al2O3-SiO2glasses

1984 ◽  
Vol 17 (1) ◽  
pp. 127-141 ◽  
Author(s):  
J P Sanchez ◽  
J M Friedt ◽  
R Horne ◽  
A J Van Duyneveldt
Keyword(s):  
Glass Transition ◽  
Spin Glass ◽  
Hyperfine Parameters ◽  
Spin Glass Transition

EPR spectrum of tetragonally compressed hexafluorocuprate(4-): ligand and metal hyperfine parameters

1986 ◽  
Vol 25 (4) ◽  
pp. 519-522 ◽  
Author(s):  
Michael A. Hitchman ◽  
R. G. McDonald ◽  
D. Reinen
Keyword(s):  
Hyperfine Parameters ◽  
Epr Spectrum
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