Journal
MATERIALS RESEARCH BULLETIN
Volume 138, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2021.111238
Keywords
Nickel ferrite; Magnetic nanoparticles; Soft magnetism; Solution combustion synthesis
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Funding
- National Council for Scientific and Technological Development (CNPq)
- Coordination for the Improvement of Higher Education Personnel (CAPES)
- Support Program for Excellence Centers of the Foundation for Research Support of the Support Program for Excellence Centers of the Foundation for Research Support of the State of Rio Grande do Sul (PRONEX/FAPERGS)
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Soft-magnetic nickel ferrite (NiFe2O4) nanoparticles were synthesized via solution combustion synthesis (SCS), and it was found that samples produced in a fuel-short regime presented the purest NiFe2O4 nanoparticles with magnetic stability even after heat treatment.
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 degrees 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 alpha-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.
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