Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles.
Structural and magnetic properties of -Fe2O3 nanoparticles annealed at 200 and 250 °C have been studied by using high resolution transmission electron microscopy TEM, electron energy loss spectroscopy, x-ray diffraction, neutron diffraction, polarized small angle neutron scattering SANS and dc magne...
| Autores: | , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2006 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/10629 |
| Acceso en línea: | https://hdl.handle.net/2445/10629 |
| Access Level: | acceso abierto |
| Palabra clave: | Nanopartícules Propietats magnètiques Física de l'estat sòlid Magnetic properties and materials Structure of solids and liquids |
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Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles.Yusuf, S. M.Teresa, J. M. deMukadam, M. D.Kohlbrecher, J.Ibarra, M. R.Arbiol i Cobos, JordiSharma, P.Kulshreshtha, S. K.NanopartículesPropietats magnètiquesFísica de l'estat sòlidMagnetic properties and materialsStructure of solids and liquidsStructural and magnetic properties of -Fe2O3 nanoparticles annealed at 200 and 250 °C have been studied by using high resolution transmission electron microscopy TEM, electron energy loss spectroscopy, x-ray diffraction, neutron diffraction, polarized small angle neutron scattering SANS and dc magnetization techniques. Here we have dealt with an important problem of the symmetry of crystal structure of -Fe2O3 nanoparticles with cation vacancy distribution. Present study also correlates various structural and magnetic results that have been obtained for -Fe2O3 nanoparticles using various experimental techniques. Analysis of x-ray and neutron diffraction data shows cation vacancies at the octahedral site, consistent with the space group P43 3 2. A log-normal distribution of particle size for both the samples has been found. A good crystallinity has been found from TEM, x-ray diffraction and neutron diffraction studies. Neutron diffraction study at room temperature confirms a ferrimagnetic ordering of tetrahedral and octahedral site moments with a net moment of 1.58 and 1.83 B per formula unit for the samples annealed at 200 and 250 °C, respectively. SANS data analysis is consistent with a mass fractal spatial arrangement of these nanoparticles with a fractal dimension of 1.25. The SANS results are consistent with the same form factor for both the chemical particle size and the magnetic particle size indicating the absence of any observable shell with disordered spins. Superparamagnetic behavior of noninteracting nanoparticles with a log-normal distribution of blocking temperature with a particle moment of 28 000 B for the sample annealed at 200 °C is found in our dc magnetization study at room temperature.The American Physical Society200920092006info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion11 p.application/pdfhttps://hdl.handle.net/2445/10629Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.74.224428Physical Review B, 2006, vol. 74, núm. 22, p. 224428/1-224428/11http://dx.doi.org/10.1103/PhysRevB.74.224428(c) The American Physical Society, 2006info:eu-repo/semantics/openAccessoai:recercat.cat:2445/106292026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles. |
| title |
Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles. |
| spellingShingle |
Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles. Yusuf, S. M. Nanopartícules Propietats magnètiques Física de l'estat sòlid Magnetic properties and materials Structure of solids and liquids |
| title_short |
Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles. |
| title_full |
Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles. |
| title_fullStr |
Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles. |
| title_full_unstemmed |
Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles. |
| title_sort |
Experimental study of the structural and magnetic properties of gamma-Fe2O3 nanoparticles. |
| dc.creator.none.fl_str_mv |
Yusuf, S. M. Teresa, J. M. de Mukadam, M. D. Kohlbrecher, J. Ibarra, M. R. Arbiol i Cobos, Jordi Sharma, P. Kulshreshtha, S. K. |
| author |
Yusuf, S. M. |
| author_facet |
Yusuf, S. M. Teresa, J. M. de Mukadam, M. D. Kohlbrecher, J. Ibarra, M. R. Arbiol i Cobos, Jordi Sharma, P. Kulshreshtha, S. K. |
| author_role |
author |
| author2 |
Teresa, J. M. de Mukadam, M. D. Kohlbrecher, J. Ibarra, M. R. Arbiol i Cobos, Jordi Sharma, P. Kulshreshtha, S. K. |
| author2_role |
author author author author author author author |
| dc.subject.none.fl_str_mv |
Nanopartícules Propietats magnètiques Física de l'estat sòlid Magnetic properties and materials Structure of solids and liquids |
| topic |
Nanopartícules Propietats magnètiques Física de l'estat sòlid Magnetic properties and materials Structure of solids and liquids |
| description |
Structural and magnetic properties of -Fe2O3 nanoparticles annealed at 200 and 250 °C have been studied by using high resolution transmission electron microscopy TEM, electron energy loss spectroscopy, x-ray diffraction, neutron diffraction, polarized small angle neutron scattering SANS and dc magnetization techniques. Here we have dealt with an important problem of the symmetry of crystal structure of -Fe2O3 nanoparticles with cation vacancy distribution. Present study also correlates various structural and magnetic results that have been obtained for -Fe2O3 nanoparticles using various experimental techniques. Analysis of x-ray and neutron diffraction data shows cation vacancies at the octahedral site, consistent with the space group P43 3 2. A log-normal distribution of particle size for both the samples has been found. A good crystallinity has been found from TEM, x-ray diffraction and neutron diffraction studies. Neutron diffraction study at room temperature confirms a ferrimagnetic ordering of tetrahedral and octahedral site moments with a net moment of 1.58 and 1.83 B per formula unit for the samples annealed at 200 and 250 °C, respectively. SANS data analysis is consistent with a mass fractal spatial arrangement of these nanoparticles with a fractal dimension of 1.25. The SANS results are consistent with the same form factor for both the chemical particle size and the magnetic particle size indicating the absence of any observable shell with disordered spins. Superparamagnetic behavior of noninteracting nanoparticles with a log-normal distribution of blocking temperature with a particle moment of 28 000 B for the sample annealed at 200 °C is found in our dc magnetization study at room temperature. |
| publishDate |
2006 |
| dc.date.none.fl_str_mv |
2006 2009 2009 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2445/10629 |
| url |
https://hdl.handle.net/2445/10629 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.74.224428 Physical Review B, 2006, vol. 74, núm. 22, p. 224428/1-224428/11 http://dx.doi.org/10.1103/PhysRevB.74.224428 |
| dc.rights.none.fl_str_mv |
(c) The American Physical Society, 2006 info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
(c) The American Physical Society, 2006 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
11 p. application/pdf |
| dc.publisher.none.fl_str_mv |
The American Physical Society |
| publisher.none.fl_str_mv |
The American Physical Society |
| dc.source.none.fl_str_mv |
Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) reponame:Recercat. Dipósit de la Recerca de Catalunya instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| instname_str |
Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| reponame_str |
Recercat. Dipósit de la Recerca de Catalunya |
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Recercat. Dipósit de la Recerca de Catalunya |
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1869411845099487232 |
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15,811543 |