Characterization and magnetic properties of hollow α-Fe2O3 microspheres obtained by sol gel and spray roasting methods
In this work, we characterize the hollow hematite (α-Fe2O3) micro spheres obtained by two non-template techniques: i) sol gel and ii) spray roasting process. Both techniques allow the production of high yield hollow hematite spheres up to 100 g for the case of sol gel and up to 500 kg for the case o...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2019-09-01
|
| Series: | Journal of Science: Advanced Materials and Devices |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468217919302059 |
| _version_ | 1818428911818637312 |
|---|---|
| author | L. De Los Santos Valladares A. Bustamante Domínguez L. León Félix J.B. Kargin D.G. Mukhambetov A.L. Kozlovskiy N.O. Moreno J. Flores Santibañez R. Castellanos Cabrera C.H.W. Barnes |
| author_facet | L. De Los Santos Valladares A. Bustamante Domínguez L. León Félix J.B. Kargin D.G. Mukhambetov A.L. Kozlovskiy N.O. Moreno J. Flores Santibañez R. Castellanos Cabrera C.H.W. Barnes |
| author_sort | L. De Los Santos Valladares |
| collection | DOAJ |
| description | In this work, we characterize the hollow hematite (α-Fe2O3) micro spheres obtained by two non-template techniques: i) sol gel and ii) spray roasting process. Both techniques allow the production of high yield hollow hematite spheres up to 100 g for the case of sol gel and up to 500 kg for the case of spray roaster process. The samples were characterized by X-ray diffraction, scanning electron microscopy and Mössbauer spectroscopy. The results indicate nearly uniform hollow spheres with diameters of around 1–1.5 μm and consisting of polycrystalline hematite. The Mӧssbauer spectroscopy reveals the signal change of quadrupole shift values evidencing the occurrence of the Morin transition and that the samples show an antiferromagnetic order at 77 K as in bulk hematite. The Morin temperature (TM) for both samples was obtained from the measurements of the magnetic moments as a function of the temperature in zero field cooling (ZFC) and field cooling (FC) modes. The values of TM for both samples are lower than that reported for bulk hematite (TM(bulk) = 263 K). Remarkably, the ZFC and FC loops do not overlap in both samples, revealing irreversible Morin transition. However, the sample obtained by sol gel presents thermal hysteresis with TM values of 260 K (in ZFC) and 248 K (FC). Whereas, the sample obtained by spray roaster process presents complete irreversibility and TM values of 252 K (in ZFC) and 242 K (in FC). Keywords: Hollow spheres, Hematite, Morin transition, Thermal hysteresis |
| first_indexed | 2024-12-14T15:09:09Z |
| format | Article |
| id | doaj.art-be7168b4fa214517ab4bd9f8952d74ef |
| institution | Directory Open Access Journal |
| issn | 2468-2179 |
| language | English |
| last_indexed | 2024-12-14T15:09:09Z |
| publishDate | 2019-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Science: Advanced Materials and Devices |
| spelling | doaj.art-be7168b4fa214517ab4bd9f8952d74ef2022-12-21T22:56:37ZengElsevierJournal of Science: Advanced Materials and Devices2468-21792019-09-0143483491Characterization and magnetic properties of hollow α-Fe2O3 microspheres obtained by sol gel and spray roasting methodsL. De Los Santos Valladares0A. Bustamante Domínguez1L. León Félix2J.B. Kargin3D.G. Mukhambetov4A.L. Kozlovskiy5N.O. Moreno6J. Flores Santibañez7R. Castellanos Cabrera8C.H.W. Barnes9Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, Liaoning 110819, People's Republic of China; Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, People's Republic of China; Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Ave., Cambridge CB3 0HE, United Kingdom; Corresponding author. Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Ave., Cambridge CB3 0HE, United Kingdom.Laboratorio de Cerámicos y Nanomateriales, Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Ap. Postal 14-0149, Lima, PeruLaboratorio de Cerámicos y Nanomateriales, Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Ap. Postal 14-0149, Lima, Peru; Laboratory of Magnetic Characterization, Instituto de Física, Universidade de Brasília, DF 70910-900 Brasília, BrazilDepartment of Technologies Commercialization, L.N. Gumilyov Eurasian National University, 010000 Astana, KazakhstanDepartment of Technologies Commercialization, L.N. Gumilyov Eurasian National University, 010000 Astana, Kazakhstan; Department of Information Systems, Almaty Academy of Economics and Statistics, 050035 Almaty, KazakhstanInstitute of Nuclear Physics, 010008 Astana, 2/1 Abylai-Khan Ave., KazakhstanDepartamento de Física, Universidade Federal de Sergipe, 49100-000 Sao Cristóvao, Sergipe, BrazilLaboratorio de Cerámicos y Nanomateriales, Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Ap. Postal 14-0149, Lima, PeruLaboratorio de Bioquímica, Facultad de Ciencias, Universidad Nacional Jorge Basadre Grohmann, Apartado Postal 316, Tacna, PeruCavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Ave., Cambridge CB3 0HE, United KingdomIn this work, we characterize the hollow hematite (α-Fe2O3) micro spheres obtained by two non-template techniques: i) sol gel and ii) spray roasting process. Both techniques allow the production of high yield hollow hematite spheres up to 100 g for the case of sol gel and up to 500 kg for the case of spray roaster process. The samples were characterized by X-ray diffraction, scanning electron microscopy and Mössbauer spectroscopy. The results indicate nearly uniform hollow spheres with diameters of around 1–1.5 μm and consisting of polycrystalline hematite. The Mӧssbauer spectroscopy reveals the signal change of quadrupole shift values evidencing the occurrence of the Morin transition and that the samples show an antiferromagnetic order at 77 K as in bulk hematite. The Morin temperature (TM) for both samples was obtained from the measurements of the magnetic moments as a function of the temperature in zero field cooling (ZFC) and field cooling (FC) modes. The values of TM for both samples are lower than that reported for bulk hematite (TM(bulk) = 263 K). Remarkably, the ZFC and FC loops do not overlap in both samples, revealing irreversible Morin transition. However, the sample obtained by sol gel presents thermal hysteresis with TM values of 260 K (in ZFC) and 248 K (FC). Whereas, the sample obtained by spray roaster process presents complete irreversibility and TM values of 252 K (in ZFC) and 242 K (in FC). Keywords: Hollow spheres, Hematite, Morin transition, Thermal hysteresishttp://www.sciencedirect.com/science/article/pii/S2468217919302059 |
| spellingShingle | L. De Los Santos Valladares A. Bustamante Domínguez L. León Félix J.B. Kargin D.G. Mukhambetov A.L. Kozlovskiy N.O. Moreno J. Flores Santibañez R. Castellanos Cabrera C.H.W. Barnes Characterization and magnetic properties of hollow α-Fe2O3 microspheres obtained by sol gel and spray roasting methods Journal of Science: Advanced Materials and Devices |
| title | Characterization and magnetic properties of hollow α-Fe2O3 microspheres obtained by sol gel and spray roasting methods |
| title_full | Characterization and magnetic properties of hollow α-Fe2O3 microspheres obtained by sol gel and spray roasting methods |
| title_fullStr | Characterization and magnetic properties of hollow α-Fe2O3 microspheres obtained by sol gel and spray roasting methods |
| title_full_unstemmed | Characterization and magnetic properties of hollow α-Fe2O3 microspheres obtained by sol gel and spray roasting methods |
| title_short | Characterization and magnetic properties of hollow α-Fe2O3 microspheres obtained by sol gel and spray roasting methods |
| title_sort | characterization and magnetic properties of hollow α fe2o3 microspheres obtained by sol gel and spray roasting methods |
| url | http://www.sciencedirect.com/science/article/pii/S2468217919302059 |
| work_keys_str_mv | AT ldelossantosvalladares characterizationandmagneticpropertiesofhollowafe2o3microspheresobtainedbysolgelandsprayroastingmethods AT abustamantedominguez characterizationandmagneticpropertiesofhollowafe2o3microspheresobtainedbysolgelandsprayroastingmethods AT lleonfelix characterizationandmagneticpropertiesofhollowafe2o3microspheresobtainedbysolgelandsprayroastingmethods AT jbkargin characterizationandmagneticpropertiesofhollowafe2o3microspheresobtainedbysolgelandsprayroastingmethods AT dgmukhambetov characterizationandmagneticpropertiesofhollowafe2o3microspheresobtainedbysolgelandsprayroastingmethods AT alkozlovskiy characterizationandmagneticpropertiesofhollowafe2o3microspheresobtainedbysolgelandsprayroastingmethods AT nomoreno characterizationandmagneticpropertiesofhollowafe2o3microspheresobtainedbysolgelandsprayroastingmethods AT jfloressantibanez characterizationandmagneticpropertiesofhollowafe2o3microspheresobtainedbysolgelandsprayroastingmethods AT rcastellanoscabrera characterizationandmagneticpropertiesofhollowafe2o3microspheresobtainedbysolgelandsprayroastingmethods AT chwbarnes characterizationandmagneticpropertiesofhollowafe2o3microspheresobtainedbysolgelandsprayroastingmethods |