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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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer US
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5374093/ https://www.ncbi.nlm.nih.gov/pubmed/28363241 http://dx.doi.org/10.1186/s11671-017-1976-1 |
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author | Ostafiychuk, Bogdan K. Kaykan, Larysa S. Kaykan, Julia S. Deputat, Bogdan Ya. Shevchuk, Olena V. |
author_facet | Ostafiychuk, Bogdan K. Kaykan, Larysa S. Kaykan, Julia S. Deputat, Bogdan Ya. Shevchuk, Olena V. |
author_sort | Ostafiychuk, Bogdan K. |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-5374093 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Springer US |
record_format | MEDLINE/PubMed |
spelling | pubmed-53740932017-04-12 Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel Ostafiychuk, Bogdan K. Kaykan, Larysa S. Kaykan, Julia S. Deputat, Bogdan Ya. Shevchuk, Olena V. Nanoscale Res Lett Nano Express 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. Springer US 2017-03-31 /pmc/articles/PMC5374093/ /pubmed/28363241 http://dx.doi.org/10.1186/s11671-017-1976-1 Text en © The Author(s). 2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
spellingShingle | Nano Express Ostafiychuk, Bogdan K. Kaykan, Larysa S. Kaykan, Julia S. Deputat, Bogdan Ya. Shevchuk, Olena V. Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel |
title | 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_short | 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 |
topic | Nano Express |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5374093/ https://www.ncbi.nlm.nih.gov/pubmed/28363241 http://dx.doi.org/10.1186/s11671-017-1976-1 |
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