Abstract

Nano size lithium ferrite was prepared through aerosol route and characterized using TEM, XRD, magnetic measurements and Mossbauer spectroscopy. The particle size of as obtained samples were found to be ~10 nm through TEM, that increases upto ~80 nm on annealing at 1200 o C. The unit cell parameter ‘a’ calculated using XRD, confirms the formation of α-LiFe5O8. Room temperature Mossbauer spectra of as obtained sample of all the ferrites exhibited broad doublet suggesting super paramagnetic nature. This doublet further resolved into two doublets and assigned to the surface region atoms and internal region atoms of the particles. The annealed samples (1200 o C) show broad sextets, which were fitted with two sextets indicating different local environment of both tetrahedrally and octahedrally coordinated Fe-cation. Cation distribution obtained from the X-ray, magnetic and M ossbauer data confirms that the three fifth of the iron atom goes in to the octahedral site.

Highlights

  • Lithium iron oxides LiFe5O8 are of increasing scientific interest and are promising candidates for cathode materials in rechargeable lithium batteries [1,2]

  • Cation distribution obtained from the X-ray, magnetic and Mössbauer data confirms that the three fifth of the iron atom goes in to the octahedral site

  • The micrographs for sample annealed at 1200 oC shows that the particle size increases with annealing temperature

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Summary

Introduction

Lithium iron oxides LiFe5O8 are of increasing scientific interest and are promising candidates for cathode materials in rechargeable lithium batteries [1,2]. A super structured form in which lithium and iron atoms are ordered is called α- LiFe5O8 and has a subgroup of Fd-3m with a primitive cubic unit cell (space group P433 or P413, a = 8.3372 Å) [5]. They are based on the inverse spinel structure with lithium and three fifth of the total Fe3+ occupying octahedral sites [6]. The high temperature used in all these techniques lower the magnetization due to the precipitation of α-Fe2O3 or the formation of Fe3O4 [10]. This work is an attempt to investigate the cation distribution using XRD, magnetic and Mössbauer measurements

Experimental
Results and Discussion
Transmission Electron Microscope
X-Ray Diffractographs
Mössbauer Spectra
Conclusions
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