Nickel zinc ferrites prepared by the citrate precursor method
Ni1-xZnxFe2O4 (x = 0.2, 0.4, 0.5, 0.6 and 0.7) were prepared by a combustion method. The precursors for the solids were different gels obtained from metal nitrates and citric acid by a sol-process. The gels thus obtained were heated at 200°C and they exhibited self-propagating combustion behavior. T...
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todo:paper_09214526_v320_n1-4_p257_Sileo2023-10-03T15:45:08Z Nickel zinc ferrites prepared by the citrate precursor method Sileo, E.E. Rotelo, R. Jacobo, S.E. Magnetic ferrites Microwave ferrites Nanoparticles Spinel ferrites Combustion Crystallization High temperature effects Lattice constants Nanostructured materials Nickel compounds Nitrates Positive ions Sintering Sol-gels X ray diffraction analysis Self-propagating combustions Ferrites Ni1-xZnxFe2O4 (x = 0.2, 0.4, 0.5, 0.6 and 0.7) were prepared by a combustion method. The precursors for the solids were different gels obtained from metal nitrates and citric acid by a sol-process. The gels thus obtained were heated at 200°C and they exhibited self-propagating combustion behavior. The residues were heated for 2 h at 1000°C. XRD analysis of the intermediates and final solids revealed that, after combustion, the gel is directly transformed into single-phased, nano-sized Ni,Zn ferrite particles. The sintering processes increased the crystallinity of the solids and the domain sizes. Lattice parameters also increase with the increment of x. The insertion of small amounts of different R(III) cations (R = Ruthenium, Yttrium and rare-earth cations) into a nickel zinc ferrite (Ni0.5Zn0.5Fe2O4) has been also investigated. XRD studies have been carried out in order to determine if the R(III) cations enter the spinel structure. Samples with several Ni0.5Zn0.5Fe2-y RyO4 compositions were prepared by the auto-combustion method. In all cases, XRD measurements show distortions in the spinel cell and, in some cases, the formation of various rare earth iron oxides. © 2002 Elsevier Science B.V. All rights reserved. Fil:Sileo, E.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09214526_v320_n1-4_p257_Sileo |
| 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 ferrites Microwave ferrites Nanoparticles Spinel ferrites Combustion Crystallization High temperature effects Lattice constants Nanostructured materials Nickel compounds Nitrates Positive ions Sintering Sol-gels X ray diffraction analysis Self-propagating combustions Ferrites |
| spellingShingle |
Magnetic ferrites Microwave ferrites Nanoparticles Spinel ferrites Combustion Crystallization High temperature effects Lattice constants Nanostructured materials Nickel compounds Nitrates Positive ions Sintering Sol-gels X ray diffraction analysis Self-propagating combustions Ferrites Sileo, E.E. Rotelo, R. Jacobo, S.E. Nickel zinc ferrites prepared by the citrate precursor method |
| topic_facet |
Magnetic ferrites Microwave ferrites Nanoparticles Spinel ferrites Combustion Crystallization High temperature effects Lattice constants Nanostructured materials Nickel compounds Nitrates Positive ions Sintering Sol-gels X ray diffraction analysis Self-propagating combustions Ferrites |
| description |
Ni1-xZnxFe2O4 (x = 0.2, 0.4, 0.5, 0.6 and 0.7) were prepared by a combustion method. The precursors for the solids were different gels obtained from metal nitrates and citric acid by a sol-process. The gels thus obtained were heated at 200°C and they exhibited self-propagating combustion behavior. The residues were heated for 2 h at 1000°C. XRD analysis of the intermediates and final solids revealed that, after combustion, the gel is directly transformed into single-phased, nano-sized Ni,Zn ferrite particles. The sintering processes increased the crystallinity of the solids and the domain sizes. Lattice parameters also increase with the increment of x. The insertion of small amounts of different R(III) cations (R = Ruthenium, Yttrium and rare-earth cations) into a nickel zinc ferrite (Ni0.5Zn0.5Fe2O4) has been also investigated. XRD studies have been carried out in order to determine if the R(III) cations enter the spinel structure. Samples with several Ni0.5Zn0.5Fe2-y RyO4 compositions were prepared by the auto-combustion method. In all cases, XRD measurements show distortions in the spinel cell and, in some cases, the formation of various rare earth iron oxides. © 2002 Elsevier Science B.V. All rights reserved. |
| format |
JOUR |
| author |
Sileo, E.E. Rotelo, R. Jacobo, S.E. |
| author_facet |
Sileo, E.E. Rotelo, R. Jacobo, S.E. |
| author_sort |
Sileo, E.E. |
| title |
Nickel zinc ferrites prepared by the citrate precursor method |
| title_short |
Nickel zinc ferrites prepared by the citrate precursor method |
| title_full |
Nickel zinc ferrites prepared by the citrate precursor method |
| title_fullStr |
Nickel zinc ferrites prepared by the citrate precursor method |
| title_full_unstemmed |
Nickel zinc ferrites prepared by the citrate precursor method |
| title_sort |
nickel zinc ferrites prepared by the citrate precursor method |
| url |
http://hdl.handle.net/20.500.12110/paper_09214526_v320_n1-4_p257_Sileo |
| work_keys_str_mv |
AT sileoee nickelzincferritespreparedbythecitrateprecursormethod AT rotelor nickelzincferritespreparedbythecitrateprecursormethod AT jacobose nickelzincferritespreparedbythecitrateprecursormethod |
| _version_ |
1782024172169330688 |