Article
Reactive flash sintering of SrFe12O19 ceramic permanent magnets
Author/s | Manchón Gordón, Alejandro F.
Sánchez Jiménez, Pedro Enrique Blázquez Gámez, Javier Sebastián Perejón Pazo, Antonio Pérez Maqueda, Luis Allan |
Department | Universidad de Sevilla. Departamento de Química Inorgánica Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Publication Date | 2022 |
Deposit Date | 2023-04-21 |
Published in |
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Abstract | Reactive flash-sintering technique has been used in order to obtain strontium ferrite magnets from a mixture of SrCO3 and Fe2O3 commercial powders. This technique allows preparing sintered SrFe12O19 at a furnace temperature ... Reactive flash-sintering technique has been used in order to obtain strontium ferrite magnets from a mixture of SrCO3 and Fe2O3 commercial powders. This technique allows preparing sintered SrFe12O19 at a furnace temperature of just 973 K during just 2 min by applying a modest field of 40 V cm-1, instead of the conventional sintering process employed in ferrite magnet manufacturing that demands high temperature and long dwell times. Analysis of structural and magnetic properties were performed as a function of time in which the flash event was held. Mössbauer spectra show the existence of five different kinds of local environments, confirming the formation of strontium hexaferrite. The resulting samples exhibit comparable magnetic properties to the state-of-the-art ferrite magnets. In particular, produced samples reach a coercivity of 0.4 T and a specific saturation magnetization of 70 Am2 kg-1. |
Funding agencies | Ministerio de Ciencia e Innovación (MICIN). España Junta de Andalucía Consejo Superior de Investigaciones Científicas (CSIC) |
Project ID. | CTQ2017-83602- C2–1-R
P18-FR-1087 US- 1262507 201960E092 202060I004 |
Citation | Manchón Gordón, A.F., Sánchez Jiménez, P.E., Blázquez Gámez, J.S., Perejón Pazo, A. y Pérez Maqueda, L.A. (2022). Reactive flash sintering of SrFe12O19 ceramic permanent magnets. Journal of Alloys and Compounds, 922. https://doi.org/10.1016/j.jallcom.2022.166203. |
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