Impedance spectroscopy study on Mn_1+xFe_2−2xTi_xO₄ (0⩽x⩽0.5) ferrites

Abstract

The complex impedance spectroscopy and surface morphology of Mn_1+xFe_2−2xTi_xO₄ (0⩽x⩽0.5) system, prepared using a conventional solid state reaction technique, were investigated. The impedance spectroscopy measurements were carried out at room temperature in the frequency range of 42–5 MHz. The electrical processes in the samples were modeled in the form of an equivalent circuit made up of a combination of two parallel RC circuits attributed to grain and grain boundaries. The DC conductivity obtained by extrapolation of AC data using impedance spectroscopy and four-probe method increases at 10% doping of Ti ions. The energy-dispersive X-ray (EDX) pattern confirmed the homogeneous mixing of the Mn, Fe, Ti and O atoms in pure and doped ferrite samples.

Keywords

spinel ferrite / magnetic properties / impedance spectroscopy / Ti⁴⁺ ions / doping

References

[1] DiasA., MoreiraR. L.. Conductivity behavior of n-type semiconducting ferrites from hydrothermal powders [J]. Journal of Materials Research, 1998, 13(8): 2190-2194

[2] KumarS., KumarR., DograA., ReddyV. R., BanerjeeA., Alimuddin. Multiferroic behavior of Ti doped Mn_0.95Mn_0.05Fe₂O₄ [J]. Indian Journal of Pure and Applied Physics, 2007, 45(1): 31-36

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

[4] MuralidharanK., SrivastavaJ. K., MaratheV. R., VijavaraghavanR.. On the magnetic ordering in the disordered spinels Zn_xCo_1−xFeCrO₄ [J]. Journal of Physics C: Solid State Physics, 1985, 18(31): 5897-5908

[5] BrandR. A., LauerJ., HerlachD. M.. The evaluation of hyperfine field distributions in overlapping and asymmetric Mossbauer spectra: A study of the amorphous alloy Pd_77.5−xCu₆Si_16.5Fe_x [J]. Journal of Physics F: Metal Physics, 1983, 13(3): 675-684

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

[7] DormannJ. L., Ei HarfauniM., 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

[8] MacdonaldJ. R.Impedance spectroscopy [M], 1987, New York, John Wiley: 12-28

[9] BouchetR., KnauthP., LaugierJ. M.. Theoretical analysis of the impedance spectra of electroceramics (Part 2): Isotropic grain boundaries [J]. Journal of Electroceramic, 2006, 16(3): 229-238

[10] KumarS., AlimuddinS., KumarR., DograA., ReddyV. R., BanerjeeA.. Mössbauer and magnetic studies of multiferroic Mg_0.95Mn_0.05Fe_2−2xTi_2xO₄ system [J]. Journal of Applied Physics, 2006, 99: 08M910

[11] BrandR. A., Georges-gibertH., HubschJ., HellerI. A.. Ferrimagnetic to spin glass transition in the mixed spinel Mg_1+tFe_2−2tTi_tO₄: A Mossbauer and DC susceptibility study [J]. Journal of Physics F: Metal Physics, 1987, 15(9): 1987-2008

[12] SuryavanshiS. S., PatilR. S., PatilS. A., SawantS. R.. DC conductivity and dielectric behavior of Ti⁴⁺ substituted Mg-Zn ferrites [J]. Journal of the Less Common Metals, 1991, 168(2): 169-174

[13] ReddyM. B., ReddyV.. Electrical conductivity of some mixed Li-Ti ferrites [J]. Physica Status Solidi, 2006, 220(2): 575-580

[14] ChandraP., BaijalJ. S.. Dielectric behaviour of tetravalent titanium-substituted Ni-Zn ferrites [J]. Journal of the Less Common Metals, 1985, 107(1): 51-57

[15] KumarS., Alimuddin, KumarR., ThakurP., ChaeK. H., AngadiB., ChoiW. K.. Electrical transport, magnetic, and electronic structure studies of Mg_0.95Mn_0.05Fe_2−2xTi_2xO_4±δ (0⩽x⩽0.5) ferrites [J]. Journal of Physics: Condensed Matter, 2007, 19(47): 476210

[16] DuttaS., ChoudharyR. N. P., SinhaP. K.. Impedance spectroscopy studies on Ga-ion-modified PLZT ceramics [J]. Physica Status Solidi, 2005, 202(6): 1172-1181