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Applied Physics A

, 124:818 | Cite as

Structural phase analysis, optical and magnetic properties of nano Mn-doped LiFe5O8

  • Zein K. Heiba
  • Mohamed Bakr MohamedEmail author
Article
  • 82 Downloads

Abstract

Nano Mn-doped LiFe5O8 was synthesized by citrate procedure. Structural and microstructure investigations have been performed applying X-ray diffraction (XRD), neutron powder diffraction (NPD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscope (TEM). Field-cooled (FC) and zero field-cooled (ZFC) dc magnetization were measured using a SQUID magnetometer. Law of Approach to saturation model was applied on hysteresis loops measured by vibrating sample magnetometer (VSM) at room temperature to obtain the saturation magnetization and magneto anisotropy constant for all samples. Rietveld analysis of XRD and NPD revealed that LiFe5O8 has ordered cubic structure with space group P4332. On the other hand XRD and FTIR analyses revealed that Mn-doped LiFe5O8 system has biphasic structures; cubic with ordered phase (P4332) and disordered one (Fd\(\overline {3}\)m). TEM image shown that the sample has an average particle size ~ 14 nm. Applying a propagation vector k=(0 0 0), all magnetic peaks of NPD data at 4 K are indexed with total magnetic moment = 1.8 μB. The coercivity and saturation magnetization reduced generally with raising the amount of Mn doping. Photoluminescence spectra of all samples exhibited two UV and one green sub-emissions.

Notes

Acknowledgements

Authors are grateful especially to Prof. H. Fuess from Technische Universität Darmstadt for neutron diffraction data.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Physics Department, Faculty of ScienceTaibah UniversityAl‑Madinah Al‑MunawaraSaudi Arabia
  2. 2.Department of Physics, Faculty of ScienceAin shams UniversityCairoEgypt

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