Mössbauer spectroscopy of ZnxMg1-x Fe2O4 (0 ≤ x ≤ 0.74) nanostructures crystallized from borate glasses
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Glasses in the system 51.7 B2O3/9.3 K2O/1 P2O5/10.4 Fe2O3/(27.6 − y) MgO/y ZnO (with y = 0, 1, 2.5, 5, 7.5, 10, 13.8, and 20) were prepared by the conventional melt quenching method. The glass samples were thermally treated at 560 °C for 3 h in ambient conditions. Using 57Fe Mössbauer spectroscopy, the effect of the substitution of MgO by ZnO in the glass network and the effect on the precipitated crystallized phase was studied. The results showed that the ratio of Zn2+:Mg2+ in the precipitated crystals increases with the ZnO concentration in the glass. The isomer shift values indicated that iron occurs as Fe3+, which is distributed at the tetrahedral (A) and the octahedral [B] sites. Introducing ZnO leads to a relative increase of the Fe3+ concentration at the B sites at the expense of that occupying the A sites. This indicates the precipitation of ZnxMg1-x Fe2O4 nanoparticles, where Zn2+ ions favorably occupy the A sites. The average hyperfine field of the samples showed a strong dependence on the Zn concentration. At the highest Zn concentration of 13.8 and 20 mol%, the samples are paramagnetic, while for the smaller ones, the samples are superparamagnetic.
KeywordsMössbauer spectroscopy Glass crystallization Ferrites Nanoparticles Magnetic properties
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We declare that we agree with the ethical standards of the journal.
Part of this study was funded by the German Academic Exchange Service (DAAD) and Bundesministerium für Forschung und Technologie via DESY PT under grant 05K16Sl1.
Conflict of interest
The authors declare that they have no conflict of interest.
- Blasse G (1964) Crystal chemistry and some magnetic properties of mixed metal oxides with spinel structure. Philips reseach reports, supplement 3. Philips Research Laboratories, Eindhoven, p 139Google Scholar
- Dyar MD (1985) A review of Mössbauer data on inorganic glasses: the effects of composition on iron valency and coordination. Am Mineral 70:304–316Google Scholar
- Fayeka MK, Ata-AHaha SS, Refaia HS, Mostafa MF (2000) On the hyperfine parameters of copper nickel-aluminum ferrite. 2nd Conference on Nuclear and Particle Physics, Cairo, Egypt, 13–17 Nov 1999Google Scholar
- He Y, Yang X, Lin J et al (2015) Mössbauer spectroscopy, structural and magnetic studies of Zn2+ substituted magnesium ferrite nanomaterials prepared by sol-gel method. J Nanomater 2015:e854840Google Scholar
- Khot SS, Shinde NS, Ladgaonkar BP et al (2011) Magnetic and structural properties of magnesium zinc ferrites synthesized at different temperature. Adv Appl Sci Res 4:460–471Google Scholar
- McBain SC, Yiu HH, Dobson J (2008) Magnetic nanoparticles for gene and drug delivery. Int J Nanomedicine 3:169–180Google Scholar
- Nath BK, Chakrabarti PK, Das S et al (2005) Mossbauer studies on nanoparticles of zinc substituted magnesium ferrite. J Surf Sci Technol 21:169–182Google Scholar
- Néel L (1949) Théorie du traînage magnétique des ferromagnétiques en grains fins avec applications aux terres cuites. Ann Géophys 5:99–136Google Scholar
- Yahya N, Mohamad Nor Aripin AS, Aziz A et al (2008) Synthesis and charaterization of magnesium zinc ferrites as electromagnetic source. Am J Eng Appl Sci 1:54–57Google Scholar