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1994 | 85 | 3 | 615-621
Article title

Single-Ion Rare Earth Anisotropy in ThMn_{12}-Type Compounds

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EN
Abstracts
EN
The single-ion rare earth anisotropy was investigated in ThMn_{12}-type compounds. For this purpose the crystal electric field parameter values were studied. In these compounds, described by formula RFe_{12-x}T_{x}, R = rare earth, T = Ti, V, Cr, Mo, W and Si, the T atoms have strong crystallographic site preference changing the local crystal electric field potential which "sees" the rare earth ion. The crystal electric field potentials A^{0}_{2} were calculated considering this site preference. The summations were performed taking into account the nearest neighborhood of the rare earth ion according to the recent results of band structure calculations. The charges of the surrounding Fe and T atoms were established applying the chemical bond model proposed by Pauling. The absolute value of A^{0}_{2} decreases when the content of vanadium increases in 8(i) position, which is in agreement with experimental data. Localization of Si atoms in 8(j) and 8(f) causes a decrease in A^{0}_{2}. The ^{155}Gd Mössbauer spectroscopy data confirm this fact. Miedema's "macroscopic" atom model of cohesion in alloys was applied for interpretation of the role of T atoms in the isomer shift and volume effects.
Keywords
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Year
Volume
85
Issue
3
Pages
615-621
Physical description
Dates
published
1994-03
received
1993-10-01
Contributors
author
  • Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-187 Poznań, Poland
References
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Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv85z315kz
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