Role of the fuel stoichiometry and post-treatment temperature on the spinel inversion and magnetic properties of NiFe2O4 nanoparticles produced by solution combustion synthesis
| Autor: | Carla Schwengber ten Caten, Leonardo M. dos Santos, Carlos Perez Bergmann, Annelise Kopp Alves, Claudir Gabriel Kaufmann, Alexandre da Cas Viegas, Gabrielli Harumi Yamashita, Rúbia Young Sun Zampiva, Janio Venturini, Michel José Anzanello |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Magnetism Mechanical Engineering Inversion (geology) Spinel Analytical chemistry Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Solution combustion 01 natural sciences 0104 chemical sciences Degree (temperature) Mechanics of Materials engineering General Materials Science Crystallite 0210 nano-technology Stoichiometry |
| Zdroj: | Materials Research Bulletin. 138:111238 |
| ISSN: | 0025-5408 |
| Popis: | Soft-magnetic nickel ferrite (NiFe2O4) nanoparticles were synthesized via solution combustion synthesis (SCS). The influence of the fuel concentration and the post-treatment temperature on the structural and magnetic properties of the samples were studied. The samples produced in a fuel-short regime presented the purest NiFe2O4 nanoparticles, with an average diameter of 32 nm. Spinel inversion degree, composition, crystallite size, and surface area were evaluated regarding their influence on the magnetic behavior of the nanoparticles. Interestingly, the magnetic properties of pure NiFe2O4 samples remained unaffected even after heat-treated above 900 °C. This result is promising for industrial applications that require magnetic stability over temperature changes. NiFe2O4 presented a critical size of 40 nm for single-domain to multi-domain transition. Below 40 nm, the discharge of Ni and α-Fe2O3 from the NiFe2O4 structure is the main factor influencing the magnetism. Pure NiFe2O4 samples treated at different temperatures presented a similar spinel inversion and consequently similar coercivities, approximately 170 Oe. |
| Databáze: | OpenAIRE |
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