Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel

Nanocrystalline lithium ferrite Li 0.5 Fe 1.7 Mg 0.8 O 4 powders were synthesized by the sol–gel auto-combustion method from the corresponding metal nitrates using citric acid as fuel. The results from XRD, SEM, and AC electrical conductivity studies are summarized as follows: The results of XRD ana...

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Bibliographic Details
Published in:Nanoscale research letters 2017-12, Vol.12 (1), p.237-237, Article 237
Main Authors: Ostafiychuk, Bogdan K., Kaykan, Larysa S., Kaykan, Julia S., Deputat, Bogdan Ya, Shevchuk, Olena V.
Format: Article
Language:English
Subjects:
Annealing
Chemistry and Materials Science
Citric acid
Combustion
Conductivity
Dielectric constant
Electrical conductivity
Electrical properties
Electrical resistivity
Electrical studies
Electron mobility
Impedance
Iron
Lithium
Lithium ferrite
Materials Science
Metal nitrates
Microstructure
Molecular Medicine
Nano Express
Nanochemistry
Nanoscale Science and Technology
Nanosized ferrite
Nanotechnology
Nanotechnology and Microengineering
Nanotechnology and Nanomaterials 2016
Nitrates
Sol-gel processes
Synthesis
Temperature
Temperature effects
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Summary:Nanocrystalline lithium ferrite Li 0.5 Fe 1.7 Mg 0.8 O 4 powders were synthesized by the sol–gel auto-combustion method from the corresponding metal nitrates using citric acid as fuel. The results from XRD, SEM, and AC electrical conductivity studies are summarized as follows: The results of XRD analysis showed that all the samples were formed in single-phase cubic spinel structure at different annealing temperatures from 300 to 700 °C for 2 h. The lattice parameter was found to decrease on increasing the temperature. The microstructure of lithium ferrite powders was temperature dependent. The particle size was increased with the annealing temperature. AC electrical properties were investigated using the super-linear power law and activation energies were calculated for all compositions. The electron mobility in Li 0.5 Fe 1.7 Mg 0.8 O 4 samples ranged from 0.05 to 0.29 eV, which clearly indicated that the present lithium ferrites have semiconductor-like behavior. The frequency exponent “s” of lithium ferrite lies in the range 0.5 
ISSN:1931-7573
1556-276X
DOI:10.1186/s11671-017-1976-1