Volume dependence of the 57Fe isomer shift in Y(Fe, Al)2

doi:10.1016/0378-4363(88)90262-8

Physica B+C

Volume 149, Issues 1–3, March–April 1988, Pages 329-333

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Abstract

The concentration, temperature and pressure dependence of the mean ⁵⁷Fe center shift were measured for Y(Fe_xAl_1−x)₂. The contribution of the second-order Doppler shift was estimated so as to allow a determination of the volume dependence of the mean isomer shift. From the obtained ΔIS/ΔV values, a dominance of the volume contribution must be concluded. Charge transfers between Fe and Al are found to be of minor importance.

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A consequence of Co/Ni substitution in the intermetallics Dy(Fe_0.4Co_0.6−xNi_x)₂ was tested in this paper. ${}^{57}{Fe}$ Mössbauer effect measurements for the intermetallic system were carried out at 4.2 K and the determined hyperfine interaction parameters as functions of composition are reported. The magnetic hyperfine field as well as the Curie temperature is strongly reduced with a composition parameter x. Band structure calculations using the full-potential linearized augmented plane waves (FLAPW) method were performed. Some properties of the 3d bands of the Fe, Co and Ni constituents are discussed. The 3d band splitting energies and the magnetic moments of transition metals reduce with x. The experimentally determined magnetic hyperfine field correlates linearly with the calculated stoichiometrically weighted magnetic moment of 3d atoms and correlates linearly with the weighted splitting energy between 3d subbands. The Curie temperature changes nonlinearly with the squared magnetic hyperfine field or with the calculated squared weighted splitting energy between 3d subbands.
Y-Fe-Al ternary system: Partial isothermal section at 1070 K: Powder X-ray diffraction and Mössbauer spectroscopy study
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Phase equilibria were established in the Y–Fe–Al ternary system within the concentration region 50–100 at.% Al for an isothermal section at 1070 K by means of scanning electron microscopy and powder X-ray diffraction. Two ternary aluminides were observed, YFe_xAl_12−x (4≤x≤5.6) with the ThMn₁₂-type structure, a=8.6467(9)–8.7604(7) Å, c=5.0374(6)–5.0504(5) Å and YFe₂Al₁₀, YbFe₂Al₁₀-type structure, a=8.9649(6) Å, b=10.1568(6) Å, c=9.0113(6) Å. The only binary which forms a prolonged solid solution range is YAl₂. The unit cell edge of the YFe_xAl_2−x compounds, MgCu₂-type structure, decreases with Fe content from 7.834(9) Å for x=0 down to 7.689(4) Å for x=0.5. ⁵⁷Fe Mössbauer spectroscopy data of YFe₂Al₁₀ show an unusually large isomer shift for Fe in Al-containing intermetallics and confirm that no magnetic ordering occurs down to 5 K.
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The electronic structure of the intermetallic compound Y(Fe_1−xAl_x)₂, a cubic Laves phase, is investigated by the full potential LAPW method. Spin-polarized calculations for YFe₂ and two ordered structures with x = 0.25 and 0.75 are performed for different volumes. These calculations yield charge densities at the Fe nucleus and lead to isomer shifts (IS) which reproduce the trends of the available experimental data. The increase in volume and the Al substitution contribute about equally to the variation of the IS in this system. The electric field gradient (EFG) is calculated on a first principles basis for all cases studied, but comparison with experiment is made difficult for various reasons.
Isomer shift and atomic environment effect in the intermetallic compound Y(Fe<inf>1-x</inf>Al<inf>x</inf>)<inf>2</inf>
1992, Journal of Magnetism and Magnetic Materials
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Magnetic and hyperfine properties of (Gd<inf>y</inf>Y<inf>1-y</inf>) (Fe<inf>x</inf>Al<inf>1-x</inf>)<inf>2</inf> alloys
1990, Journal of Magnetism and Magnetic Materials
Magnetic and ⁵⁷Fe Mössbauer measurements are reported for the quaternary system (Gd,Y)(Fe,Al)₂. The results are discussed in combination with those of the ternary systems R(Fe,Al)₂, R = Gd,Y and (Gd,Y)Al₂. As long as long range order is present, for all iron concentrations a linear decrease of the saturation magnetization with decreasing Gd content is observed, which points to a GdFe exchange interaction independent of the dilution process. Due to a competition of the ferromagnetic GdGd and the antiferromagnetic GdFe interaction together with the tendency of Fe to remain randomly oriented, a pronounced expansion of the cluster glass regime (peaking at 55 at% Gd for 20 at% Fe) is observed with increasing Fe concentration. At the Fe rich side, a small amount of Gd (12 at% for 70 at% Fe) stabilizes long range order. The transferred contribution to the mean hyperfine field (H_hf) due to the Gd atoms is small. The variations of H_hf(x) are dominated by the concentration dependence of the valence contribution. Neither the dilution by Y nor the substitution of Al seems to change the electronic structure of Fe significantly.

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Volume dependence of the 57Fe isomer shift in Y(Fe, Al)2

Abstract

J. Phys. Chem. Sol.

J. Phys. Chem. Sol.

J. Phys. F

Hyperfine Interactions

Z. Phys. B

Rev. Sci. Instr.

J. Phys. F

Volume dependence of the ⁵⁷Fe isomer shift in Y(Fe, Al)₂