New determination of the electric field gradients and isomer shifts of181Ta in NaTaO3 and LiTaO3

1978 ◽  
Vol 4 (1-2) ◽  
pp. 610-614 ◽  
Author(s):  
G. Wortmann ◽  
G. Trollmann ◽  
A. Heidemann ◽  
G. M. Kalvius
Keyword(s):  
Electric Field ◽  
Electric Field Gradients ◽  
Field Gradients

Single-crystal 57Fe Mössbauer studies of the site positions in cordierite

1974 ◽  
Vol 27 (2) ◽  
pp. 249 ◽  
Author(s):  
JF Duncun ◽  
JH Johnson
Keyword(s):  
Electric Field ◽  
Total Iron ◽  
Total Iron Content ◽  
Electric Field Gradients ◽  
Quadrupole Split ◽  
Octahedral Sites ◽  
Field Gradients ◽  
Tetrahedral Sites ◽  
Peak Areas

Mossbauer (57Fe) absorption spectra of different orientations of single crystals of cordierite (Mg,Fe)2AI3 [Si5AIO18] have been determined. The variation of the ratio of the peak areas of the quadrupole split lines with orientation has enabled the determination of the electric field gradient directions, and the site positions and occupancies of the Fe2+ and Fe3+ ions. Of a total iron content of 1.85% w/w, 79% is present as Fe2+ replacing Mg2+ in the octahedral sites; 19% as Fe2+ occupying the larger of two channel sites; and 1% as Fe3+ replacing Al3+ in the larger of the two tetrahedral sites. A possible interpretation of the observed pleochroism in terms of Fe2+-Fe2+ and Fe2+-Fe3+ electranic interactions along the directions of the electric field gradients of these ions is suggested.

Effects of non-axial electric field gradients on the ferromagnetic state of amorphous rare-earth alloys

1980 ◽  
Vol 58 (5) ◽  
pp. 629-632 ◽  
Author(s):  
H. Hernandez ◽  
R. Ferrer ◽  
M. J. Zuckermann
Keyword(s):  
Rare Earth ◽  
Electric Field ◽  
Ferromagnetic State ◽  
Rare Earth Alloys ◽  
Electric Field Gradients ◽  
Axial Electric Field ◽  
Ferromagnetic Alloys ◽  
Field Gradients ◽  
Ordered State

We discuss the influence of non-axial electric field gradients on the ordered state of amorphous ferromagnetic alloys containing rare-earth atoms.

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