Artículo
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" (2004) Physics and Chemistry of Minerals. 31(9):625-632
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Abstract:
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.
Registro:
| Documento: | Artículo |
| Título: | Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates |
| Autor: | Saragovi, C.; Arpe, J.; Sileo, E.; Zysler, R.; Sanchez, L.C.; Barrero, C.A. |
| Filiación: | Departamento de Física, Comision Nacional de Energia Atamica, Av. Gral Paz 1499, San Martín, Buenos Aires 1650, Argentina Departamento de Quimica Inorganica, Fac. de Ciencias Exactas/Naturales, Universidad de Buenos Aires, Pabellon II, Piso 3, Buenos Aires, Argentina Centro Atómico Bariloche CNEA, 8400 S.C. de Bariloche, RN, Argentina Grupo de Estado Sólido, Instituto de Física, Universidad de Antioquia, A.A. 1226 Medellín, Colombia |
| Palabras clave: | 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 |
| Año: | 2004 |
| Volumen: | 31 |
| Número: | 9 |
| Página de inicio: | 625 |
| Página de fin: | 632 |
| DOI: | http://dx.doi.org/10.1007/s00269-004-0422-y |
| Título revista: | Physics and Chemistry of Minerals |
| Título revista abreviado: | Phys. Chem. Miner. |
| ISSN: | 03421791 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03421791_v31_n9_p625_Saragovi |
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Citas:
---------- APA ----------
Saragovi, C., Arpe, J., Sileo, E., Zysler, R., Sanchez, L.C. & Barrero, C.A. (2004) . Changes in the structural and magnetic properties of Ni-substituted hematite prepared from metal oxinates. Physics and Chemistry of Minerals, 31(9), 625-632.http://dx.doi.org/10.1007/s00269-004-0422-y
---------- CHICAGO ----------
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" . Physics and Chemistry of Minerals 31, no. 9 (2004) : 625-632.http://dx.doi.org/10.1007/s00269-004-0422-y
---------- MLA ----------
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" . Physics and Chemistry of Minerals, vol. 31, no. 9, 2004, pp. 625-632.http://dx.doi.org/10.1007/s00269-004-0422-y
---------- VANCOUVER ----------
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. Phys. Chem. Miner. 2004;31(9):625-632.http://dx.doi.org/10.1007/s00269-004-0422-y
