Magnetic and structural properties of a silica/SrFe12O19 nanocomposite subjected to different heat-treatments
Por:
Guerrero A.L., Murillo-Ortíz R., López-Gutiérrez B.N., Ramírez-Ayala M.F., Martínez J.R., Espericueta D., Ortega-Zarzosa G.
Publicada:
1 ene 2025
Resumen:
This study reports on the preparation of a silica composite containing strontium hexaferrite nanoparticles. We investigated its structural and magnetic properties, examining the influence of both the magnetic nanoparticle concentration and various heat treatment conditions. This work addresses the critical need for precise control over the structure and magnetic properties of silica-based composites with magnetic nanoparticles for biomedical applications. The magnetic nanocomposite was fabricated using strontium hexaferrite (SrFe12O19) nanoparticles, incorporated into the silica during the hydrolysis/condensation reaction of the sol-gel process to obtain a homogeneous mix. To understand the impact of heat treatment, we investigated the structural and magnetic properties of the nanocomposite after thermal processing through two different heating routes: using an electrical furnace and by means of microwave hybrid heating using low power microwave oven. The heat treatment was carried out at 850 and 1050 °C, while the microwave processing lasted for 20- and 30-min. Results showed high tuneability of the structural and magnetic properties. The silica matrix can range from amorphous to crystalline, whereas the magnetic properties can be adjusted from hard-magnetic to soft-magnetic. The samples processed using microwave hybrid heating show marked differences in their structural and magnetic properties compared to those obtained via conventional heating. Specifically, the sample obtained at 20 min retains the amorphous structure and induces a drop in coercive field from 2.0 to 0.28 kOe, while the squareness ratio decreased from 0.5 to 0.1. This behavior is attributed to a phase evolution of the hexaferrite nanoparticles embedded in the amorphous quartz matrix. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.
Filiaciones:
Guerrero A.L.:
Área Académica de Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Carr. Pachuca-Tulancingo km 4.5, Mineral de la Reforma, C.P. 42039, Mexico
Murillo-Ortíz R.:
Centro de Investigación en Ciencia Físico Matemáticas, Universidad Autónoma de Nuevo, León. Pedro de Alba S/N, Ciudad Universitaria, N.L, San Nicolas de los Garza, C.P. 66455, Mexico
López-Gutiérrez B.N.:
Área Académica de Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Carr. Pachuca-Tulancingo km 4.5, Mineral de la Reforma, C.P. 42039, Mexico
Ramírez-Ayala M.F.:
Facultad de Ciencias, Universidad Nacional Autónoma de México, CDMX, C.P. 04510, Mexico
Martínez J.R.:
Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, SLP, San Luis Potosí, C.P. 78000, Mexico
Espericueta D.:
Instituto tecnológico de San Luis Potosí, Capital, Tecnológico Nacional de México/ ITSSLP, Carr Mex-piedras Negras Km 189+100 No. 6501, Calle Villa de Pozos, SLP, San Luis Potosí, C.P. 78421, Mexico
Ortega-Zarzosa G.:
Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, SLP, San Luis Potosí, C.P. 78000, Mexico
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