Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel
Abstract 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 o...
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doaj-e1d0d37301ec4dcea05a9ec2239f9a462020-11-25T00:24:08ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2017-03-011211910.1186/s11671-017-1976-1Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the FuelBogdan K. Ostafiychuk0Larysa S. Kaykan1Julia S. Kaykan2Bogdan Ya. Deputat3Olena V. Shevchuk4Vasyl Stefanyk PreCarpathian National UniversityG.V. Kurdyumov Institute for Metal Physics, N.A.S. of UkraineVasyl Stefanyk PreCarpathian National UniversityIvano-Frankivsk National Technical University of Oil and GasIvano-Frankivsk National Technical University of Oil and GasAbstract 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 < s < 1, which confirms the electron hopping between Fe 2 + and Fe 3 + ions.http://link.springer.com/article/10.1186/s11671-017-1976-1Nanosized ferriteImpedanceDielectric constantConductivity |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Bogdan K. Ostafiychuk Larysa S. Kaykan Julia S. Kaykan Bogdan Ya. Deputat Olena V. Shevchuk |
spellingShingle |
Bogdan K. Ostafiychuk Larysa S. Kaykan Julia S. Kaykan Bogdan Ya. Deputat Olena V. Shevchuk Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel Nanoscale Research Letters Nanosized ferrite Impedance Dielectric constant Conductivity |
author_facet |
Bogdan K. Ostafiychuk Larysa S. Kaykan Julia S. Kaykan Bogdan Ya. Deputat Olena V. Shevchuk |
author_sort |
Bogdan K. Ostafiychuk |
title |
Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel |
title_short |
Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel |
title_full |
Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel |
title_fullStr |
Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel |
title_full_unstemmed |
Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel |
title_sort |
composition, microstructure, and electrical properties control of the powders synthesized by sol–gel auto-combustion method using citric acid as the fuel |
publisher |
SpringerOpen |
series |
Nanoscale Research Letters |
issn |
1931-7573 1556-276X |
publishDate |
2017-03-01 |
description |
Abstract 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 < s < 1, which confirms the electron hopping between Fe 2 + and Fe 3 + ions. |
topic |
Nanosized ferrite Impedance Dielectric constant Conductivity |
url |
http://link.springer.com/article/10.1186/s11671-017-1976-1 |
work_keys_str_mv |
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