The effect of preferred orientation on high-field Mössbauer spectra of goethite

1992 ◽  
Vol 104-107 ◽  
pp. 1557-1559 ◽  
Author(s):  
R.J. Pollard ◽  
Q.A. Pankhurst ◽  
P. Zientek
Keyword(s):  
High Field ◽  
Mössbauer Spectra ◽  
Preferred Orientation ◽  
Mossbauer Spectra

scholarly journals Evaluation of Exchange and Anisotropy Constants of Molecular Species from High Field Mössbauer Spectra

1998 ◽  
Vol 51 (2) ◽  
pp. 363
Author(s):  
J. D. Cashion ◽  
S. R. Shannon
Keyword(s):  
Magnetic Field ◽  
Molecular Species ◽  
Applied Magnetic Field ◽  
High Field ◽  
Mössbauer Spectra ◽  
Molecular Field ◽  
Field Equations ◽  
Mossbauer Spectra ◽  
Range Of Values

The molecular field equations for the allowed spin directions for dimer and trimer molecular species have been solved numerically for a range of values of the exchange and anisotropy interactions and of the applied magnetic field. The results may be used for the evaluation of the exchange and anisotropy constants from high field Mössbauer spectra or for selecting the best conditions for proposed experiments in order to determine these parameters.

Observations on implanted xenon-133 sources

1969 ◽  
Vol 311 (1504) ◽  
pp. 139-150 ◽  
Keyword(s):  
Isomer Shift ◽  
High Field ◽  
Mössbauer Spectra ◽  
High Dose ◽  
Zero Field ◽  
Substitutional Site ◽  
Mossbauer Spectra ◽  
Low Field ◽  
Band Spectra ◽  
Considerable Spread

Mössbauer spectra of the 81 keV line of 133 Cs excited in the decay of 133 Xe implanted in iron are presented for a large range of xenon concentrations. The spectra indicate that there are two main locations for the Xe atoms: high field sites, with | H | = 273±10 kOe and an isomer shift δ H ≃ - 1.1 mm/s and low (or zero) field sites, with | H | < 25 kOe and δ 0 = - 0·2 to - 0·4 mm/s. For doses below about 2 x 10 14 Xe atoms/cm 2 (implanted at 50 keV) the intensity ratio of the Mössbauer spectra of Cs nuclei at high and low field sites varies irregularly between 0·1 and 0·3, while at a high dose (~ 10 15 at./cm 2 ) and also after annealing foils with a low dose this ratio becomes large. The considerable spread of the isomer shifts at low field sites may arise from non-equivalence of these sites, at which the Xe atoms are supposed to have formed clusters. The remarkably large isomer shift for the high field sites, for which the Xe atoms are believed to be substitutionally implanted, could be caused by promotion of about two 5 p electrons to the conduction band. Spectra are also presented for 133 Xe sources implanted in vanadium and chromium. The source in vanadium again gives evidence of the existence of two different sites, presumably a cluster site and a substitutional site. The source in chromium shows one broad line with large isomer shift.

A MODEL FOR EXPLAINING THE MÖSSBAUER SPECTRA OF FERRIMAGNETIC SPINELS WITH A HIGH DEGREE OF DIAMAGNETIC SUBSTITUTION

1979 ◽  
Vol 40 (C2) ◽  
pp. C2-669-C2-670 ◽  
Author(s):  
E. De Grave ◽  
A. Govaert ◽  
D. Chambaere ◽  
G. Robbrecht
Keyword(s):  
Mössbauer Spectra ◽  
Mossbauer Spectra ◽  
High Degree

Laser Modification of Mossbauer Spectra in Eu2+:CaS

2001 ◽  
Author(s):  
Olga Kocharovskaya ◽  
Zameer Hasan ◽  
James Carroll
Keyword(s):  
Mössbauer Spectra ◽  
Laser Modification ◽  
Mossbauer Spectra
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