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Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion
Samples of cobalt-doped neodymium orthoferrite compounds, NdCo(x)Fe(1−x)O(3) (0.0 ≤ x ≤ 0.5) were synthesized via glycine auto-combustion between 250 and 300°C and calcined at 500°C for 2 h. X-ray diffraction showed that all compounds had an orthorhombic perovskite structure with space group Pbnm. I...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8074633/ https://www.ncbi.nlm.nih.gov/pubmed/33972869 http://dx.doi.org/10.1098/rsos.201883 |
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author | Nforna, Edwin Akongnwi Tsobnang, Patrice Kenfack Fomekong, Roussin Lontio Tedjieukeng, Hypolite Mathias Kamta Lambi, John Ngolui Ghogomu, Julius Numbonui |
author_facet | Nforna, Edwin Akongnwi Tsobnang, Patrice Kenfack Fomekong, Roussin Lontio Tedjieukeng, Hypolite Mathias Kamta Lambi, John Ngolui Ghogomu, Julius Numbonui |
author_sort | Nforna, Edwin Akongnwi |
collection | PubMed |
description | Samples of cobalt-doped neodymium orthoferrite compounds, NdCo(x)Fe(1−x)O(3) (0.0 ≤ x ≤ 0.5) were synthesized via glycine auto-combustion between 250 and 300°C and calcined at 500°C for 2 h. X-ray diffraction showed that all compounds had an orthorhombic perovskite structure with space group Pbnm. Increasing cobalt doping gradually reduced the lattice parameters and contracted the unit cell volume. Both X-ray diffraction and scanning electron microscopy showed that the particles were spherical and in the nano-sized range (19–52 nm) with pores between grains. Vibrating sample magnetometry at room temperature indicated that NdFeO(3) has a high coercive field (1950 Oe) and cobalt substitution for iron led to a decrease in the coercive field, saturation and remanent magnetization, which was as a result of decreased magnetic moments in the crystal and reduced canting of the FeO(6) octahedra. The increase in magnetization and coercive fields with increase of Co was connected to the microstructure (bond lengths and angles, defects, pores, grain boundaries) and crystallite size. The compounds NdCo(x)Fe(1−x)O(3) show antiferromagnetism with weak ferromagnetism due to uncompensated non-collinear moments. These compounds could serve as prototypes for tuning the properties of magnetic materials (ferromagnetic and antiferromagnetic) with potential applications in data storage, logic gates, switches and sensors. |
format | Online Article Text |
id | pubmed-8074633 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | The Royal Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-80746332021-05-09 Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion Nforna, Edwin Akongnwi Tsobnang, Patrice Kenfack Fomekong, Roussin Lontio Tedjieukeng, Hypolite Mathias Kamta Lambi, John Ngolui Ghogomu, Julius Numbonui R Soc Open Sci Chemistry Samples of cobalt-doped neodymium orthoferrite compounds, NdCo(x)Fe(1−x)O(3) (0.0 ≤ x ≤ 0.5) were synthesized via glycine auto-combustion between 250 and 300°C and calcined at 500°C for 2 h. X-ray diffraction showed that all compounds had an orthorhombic perovskite structure with space group Pbnm. Increasing cobalt doping gradually reduced the lattice parameters and contracted the unit cell volume. Both X-ray diffraction and scanning electron microscopy showed that the particles were spherical and in the nano-sized range (19–52 nm) with pores between grains. Vibrating sample magnetometry at room temperature indicated that NdFeO(3) has a high coercive field (1950 Oe) and cobalt substitution for iron led to a decrease in the coercive field, saturation and remanent magnetization, which was as a result of decreased magnetic moments in the crystal and reduced canting of the FeO(6) octahedra. The increase in magnetization and coercive fields with increase of Co was connected to the microstructure (bond lengths and angles, defects, pores, grain boundaries) and crystallite size. The compounds NdCo(x)Fe(1−x)O(3) show antiferromagnetism with weak ferromagnetism due to uncompensated non-collinear moments. These compounds could serve as prototypes for tuning the properties of magnetic materials (ferromagnetic and antiferromagnetic) with potential applications in data storage, logic gates, switches and sensors. The Royal Society 2021-02-03 /pmc/articles/PMC8074633/ /pubmed/33972869 http://dx.doi.org/10.1098/rsos.201883 Text en © 2021 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited. |
spellingShingle | Chemistry Nforna, Edwin Akongnwi Tsobnang, Patrice Kenfack Fomekong, Roussin Lontio Tedjieukeng, Hypolite Mathias Kamta Lambi, John Ngolui Ghogomu, Julius Numbonui Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion |
title | Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion |
title_full | Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion |
title_fullStr | Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion |
title_full_unstemmed | Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion |
title_short | Effect of B-site Co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion |
title_sort | effect of b-site co substitution on the structure and magnetic properties of nanocrystalline neodymium orthoferrite synthesized by auto-combustion |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8074633/ https://www.ncbi.nlm.nih.gov/pubmed/33972869 http://dx.doi.org/10.1098/rsos.201883 |
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