Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates
Samples prepared by the novel method based on the thermal decomposition at 700 °C in air of mixed Fe and Ni oxinates were characterized by thermogravimetric analysis, X-ray diffraction, magnetization measurements, and variable-temperature Mössbauer spectroscopy. It is found that the combustion treat...
Guardado en:
| Autores principales: | , , , , , |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03421791_v31_n9_p625_Saragovi |
| Aporte de: |
| id |
todo:paper_03421791_v31_n9_p625_Saragovi |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_03421791_v31_n9_p625_Saragovi2023-10-03T15:26:12Z Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates Saragovi, C. Arpe, J. Sileo, E. Zysler, R. Sanchez, L.C. Barrero, C.A. Magnetic properties Mössbauer spectroscopy Morín transition Néel temperature Ni-doped hematite Anisotropy Iron Magnetization Pyrolysis Thermogravimetric analysis X ray diffraction Hematite Lattice distoritons Trevorite Nickel hematite magnetic property mineralogy nickel Samples prepared by the novel method based on the thermal decomposition at 700 °C in air of mixed Fe and Ni oxinates were characterized by thermogravimetric analysis, X-ray diffraction, magnetization measurements, and variable-temperature Mössbauer spectroscopy. It is found that the combustion treatment produces Ni-hematite and trevorite, the fraction of the latter increasing with the increment of Ni in the metal oxinates. Results indicate that the substitution of Ni2+ for Fe3+ in the hematite structure, which was found to be less than 5.3 mol%, is accompanied by the presence of oxygen and structural vacancy sites. Both the metal replacement and the presence of defects cause the a and c cell hematite parameters to decrease. The Néel temperature and the difference between the saturation fields for the antiferromagnetic AF and the weakly ferromagnetic WF phases are also found to decrease with nickel content. These effects are due to the fact that the magnetic behavior of hematite depends on the presence of Ni, vacancy sites, and lattice distortion. The large decrease in the Néel temperature with Ni doping suggests that structural vacancies are also present On the contrary, Ni incorporation does not appreciably affect the Morin temperature and the temperature range in which both AF and WF phases coexist. It is suggested that these effects are probably due to the differing effects that Ni and defects can produce on the magnetic dipolar and the single ion anisotropies. © Springer-Verlag Berlin Heidelberg 2004. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03421791_v31_n9_p625_Saragovi |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Magnetic properties Mössbauer spectroscopy Morín transition Néel temperature Ni-doped hematite Anisotropy Iron Magnetization Pyrolysis Thermogravimetric analysis X ray diffraction Hematite Lattice distoritons Trevorite Nickel hematite magnetic property mineralogy nickel |
| spellingShingle |
Magnetic properties Mössbauer spectroscopy Morín transition Néel temperature Ni-doped hematite Anisotropy Iron Magnetization Pyrolysis Thermogravimetric analysis X ray diffraction Hematite Lattice distoritons Trevorite Nickel hematite magnetic property mineralogy nickel Saragovi, C. Arpe, J. Sileo, E. Zysler, R. Sanchez, L.C. Barrero, C.A. Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates |
| topic_facet |
Magnetic properties Mössbauer spectroscopy Morín transition Néel temperature Ni-doped hematite Anisotropy Iron Magnetization Pyrolysis Thermogravimetric analysis X ray diffraction Hematite Lattice distoritons Trevorite Nickel hematite magnetic property mineralogy nickel |
| description |
Samples prepared by the novel method based on the thermal decomposition at 700 °C in air of mixed Fe and Ni oxinates were characterized by thermogravimetric analysis, X-ray diffraction, magnetization measurements, and variable-temperature Mössbauer spectroscopy. It is found that the combustion treatment produces Ni-hematite and trevorite, the fraction of the latter increasing with the increment of Ni in the metal oxinates. Results indicate that the substitution of Ni2+ for Fe3+ in the hematite structure, which was found to be less than 5.3 mol%, is accompanied by the presence of oxygen and structural vacancy sites. Both the metal replacement and the presence of defects cause the a and c cell hematite parameters to decrease. The Néel temperature and the difference between the saturation fields for the antiferromagnetic AF and the weakly ferromagnetic WF phases are also found to decrease with nickel content. These effects are due to the fact that the magnetic behavior of hematite depends on the presence of Ni, vacancy sites, and lattice distortion. The large decrease in the Néel temperature with Ni doping suggests that structural vacancies are also present On the contrary, Ni incorporation does not appreciably affect the Morin temperature and the temperature range in which both AF and WF phases coexist. It is suggested that these effects are probably due to the differing effects that Ni and defects can produce on the magnetic dipolar and the single ion anisotropies. © Springer-Verlag Berlin Heidelberg 2004. |
| format |
JOUR |
| author |
Saragovi, C. Arpe, J. Sileo, E. Zysler, R. Sanchez, L.C. Barrero, C.A. |
| author_facet |
Saragovi, C. Arpe, J. Sileo, E. Zysler, R. Sanchez, L.C. Barrero, C.A. |
| author_sort |
Saragovi, C. |
| title |
Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates |
| title_short |
Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates |
| title_full |
Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates |
| title_fullStr |
Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates |
| title_full_unstemmed |
Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates |
| title_sort |
changes in the structural and magnetic properties of ni-substituted hematite prepared from metal oxinates |
| url |
http://hdl.handle.net/20.500.12110/paper_03421791_v31_n9_p625_Saragovi |
| work_keys_str_mv |
AT saragovic changesinthestructuralandmagneticpropertiesofnisubstitutedhematitepreparedfrommetaloxinates AT arpej changesinthestructuralandmagneticpropertiesofnisubstitutedhematitepreparedfrommetaloxinates AT sileoe changesinthestructuralandmagneticpropertiesofnisubstitutedhematitepreparedfrommetaloxinates AT zyslerr changesinthestructuralandmagneticpropertiesofnisubstitutedhematitepreparedfrommetaloxinates AT sanchezlc changesinthestructuralandmagneticpropertiesofnisubstitutedhematitepreparedfrommetaloxinates AT barreroca changesinthestructuralandmagneticpropertiesofnisubstitutedhematitepreparedfrommetaloxinates |
| _version_ |
1807320975151202304 |