Mössbauer spectra of MnFe_2−2xAl_2xO₄ (0≼x≼0.4) ferrites

Abstract

The effect of non-magnetic Al³⁺ ion doping on the magnetic properties of MnFe_2−2xAl_2xO₄ (0≼x≼0.4) spinel ferrites was studied using Mössbauer spectroscopy measurements at room temperature. From the Mössbauer study, it is observed that the resolved hyperfine sextets are due to the distribution of Fe ions on the two sublattices of the spinel ferrites. The value of the isomer shift obtained from the fitting of the Mössbauer spectra indicates that Fe ions are in +3 state. A paramagnetic doublet is observed at degree of inversion x=0.4, superimposed on the hyperfine sextets, indicating that the super-exchange interaction A–B decreases due to the dilution of sublattice by Al³⁺ ions. The hyperfine magnetic field decreases at both interstitial sites of tetrahedral (A) and octahedral (B) with the increase in Al concentration.

Keywords

ferrites / hyperfine interactions / Mössbauer spectroscopy / isomer shift

References

[1] DormannJ. M., NoguesM.. Magnetic structures in substituted ferrites [J]. Journal of Physics: Condensed Matter, 1990, 2(5): 1223-1238

[2] BhargavaS. C., ZemanN.. Mössbauer study of Ni_0.25Zn_0.75Fe₂O₄. I: Spin fluctuations [J]. Physical Review B, 1980, 21(5): 1717-1725

[3] FioraniD., ViticoliS., DormanJ. L., TholenceJ. L., MuraniA. P.. Spin-glass behavior in an antiferromagnetic frustrated spinel: ZnCr_1.6Ga_0.4O₄ [J]. Physical Review B, 1984, 30(5): 2776-2786

[4] Satya MurthyN. S., NeteraM. G., YousefS. I., BegumR. J., SrivastavaC. M.. Yafet-Kittel angles in zinc-nickel ferrites [J]. Physical Review, 1969, 181(2): 969-977

[5] DormannJ. L., HarfauniM. E. I., NoguesM., JoveJ.. Relaxation of the transverse spin component in randomly canted Li-Ti ferrite below T_N [J]. Journal of Physics C: Solid State Physics, 1987, 20(10): 161-166

[6] VillainJ.. Insulating spin glasses [J]. Journal of Physics B, 1979, 33(1): 31-42

[7] MössbauerR. L.. Kernresonanzfluoreszenz von Gammastrahlung in Ir 191[J]. Journal of Physics A, 1958, 151(2): 124-143

[8] HannaS. S., HeberleJ., LittlejohnC., PerlowG. J., PrstonR. S., VincentD. S., WertheimG. K.. Polarized spectra and hyperfine structure in Fe⁵⁷[J]. Physical Review Letters, 1960, 4(4): 177-180

[9] KistnerO. C., SunyarA. W.. Evidence for quadrupole interaction of Fe^57m, and influence of chemical binding on nuclear gamma-ray energy [J]. Physical Review Letters, 1960, 4(8): 412-415

[10] KumarS., AlimuddiN., KumarR., DograA., ReddyV. R.. Mössbauer and magnetic studies of multiferroic Mg_0.95Mn_0.05Fe_2−2x-Ti_2xO₄ system [J]. Journal of Applied Physics, 2006, 99: 08M910

[11] TangH., DuY. W., QiuZ. Q., WalkerJ. C.. Mössbauer investigation of zinc ferrite particles [J]. Journal of Applied Physics, 1948, 63(8): 4105-4107

[12] HudsonA., WhitfieldH. J.. Electric field gradients in normal spinels [J]. Molecular Physics, 1967, 12(2): 165-172

[13] DobsonD. C., LinnettJ. W., RahmanM. M.. Mössbauer studies of the charge transfer process in the system Zn_xFe_3−xO₄ [J]. Journal of Physics and Chemistry of Solids, 1971, 31(12): 2727-2733

[14] DicksonD. P. E., BerryF. J.Mössbauer Spectroscopy [M], 1986, London, Cambridge University Press: 22-32

[15] LuengL. K., EvansB. J., MorrishA. H.. Low-temperature Mössbauer study of a nickel-zinc ferrite: Zn_xNi_1−xFe₂O₄ [J]. Physical Review B, 1973, 8(1): 29-43

[16] PetittG. A., ForesterD. W.. Mössbauer study of cobalt-zinc ferrites [J]. Physical Review B, 1971, 4(11): 3912-3923

[17] MorrishA. H., ClarkP. E.. High-field Mössbauer study of manganese-zinc ferrites [J]. Physical Review B, 1975, 11(1): 278-286

[18] OwenR., TaylorD. R.. Zero-point spin deviation in antiferromagnets [J]. Physical Review Letters, 1964, 16(25): 1164-1166

[19] HuangN. L., OrbachR., SimanekE.. Contribution to the hyperfine field from cation-cation interactions [J]. Physical Review Letters, 1966, 17(3): 134-136

[20] SrivastavaC. M., ShringiS. N., SrivastavaR. G.. Mössbauer study of relaxation phenomena in zinc-ferrous ferrites [J]. Physical Review B, 1976, 14(5): 2041-2050

[21] NeelL.. Magnetic properties of femtes: Ferrimagnetism and antiferromagnetism [J]. Annual Physics, 1948, 3: 137-198

[22] RashadM. M.. Synthesis and magnetic properties of manganeseferrite from low grade manganese ore [J]. Materials Science Engineering B, 2006, 127(2/3): 123-129