Boosting the coercivity of SrFe12O19 nanocrystalline powders obtained using the citrate combustion synthesis method
| Autor: | Pilar Marín, A. Quesada, J. C. Guzmán-Mínguez, Cecilia Granados-Miralles, Jesús López-Sánchez, Julio F. Fernández, L Moreno-Arche |
|---|---|
| Přispěvatelé: | European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Comunidad de Madrid |
| Rok vydání: | 2020 |
| Předmět: |
Strontium
Materials science Acoustics and Ultrasonics Permanent magnets Composite number chemistry.chemical_element Coercivity Processing Condensed Matter Physics Combustion Nanocrystalline material Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemical engineering chemistry Magnet Low-temperature combustion synthesis Ferrite (magnet) Ferrites Ball mill |
| Zdroj: | Digital.CSIC: Repositorio Institucional del CSIC Consejo Superior de Investigaciones Científicas (CSIC) Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Strontium hexaferrite nanocrystalline powders were synthesized using a citrate combustion method and subsequently subjected to post-synthesis processing with the aim of tuning the micro-nanostructure to improve the magnetic properties. Firstly, the synthesis thermal treatments were optimized in order to minimize the formation of secondary phases, mainly hematite. Secondly, the as-synthesized powders were conditioned by a two-step process: ball milling in wet medium (ethanol) and high-speed mixing. The final processed powders exhibited a saturation magnetization of 74 emu g-1 and a coercivity of 6450 Oe. Following a low-temperature combustion synthesis, the coercivity is one of the largest values reported for strontium ferrites. The combination of the two-step conditioning procedure results in a useful methodology to obtain SrFe12O19 nanocrystalline powders with competitive properties. The morphological, structural and magnetic properties of the processed material make it a promising candidate for hard-soft ferrite-based composite magnets, where large coercivity values are highly desirable. This work is supported by the Spanish Ministerio de Ciencia e Innovación through Project Nos. MAT2017-86450-C4-1-R, RTI2018-095303-B-C51, RTI2018-095303-B-C53, RTI2018-095303-A-C52, and FIS2017-82415-R and through the Ramón y Cajal Contract RYC-2017-23320; and by the European Commission through Project H2020 No. 720853 (AMPHIBIAN). The work is funded as well by the Regional Government of Madrid through Project S2018/NMT-4321 (NANOMAGCOST). C G-M acknowledges financial support from MICINN through the ‘Juan de la Cierva’ Program (FJC2018-035532-I). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|