Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 126, Issue 7, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-020-03716-x
Keywords
Nanoparticles; Magnetic materials; Mossbauer; X-ray techniques
Funding
- Ministry of science research and technology of Iran under the FRGS Grant, Malayer University of Iran
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In this investigation, we have used the thermal treatment method for the preparation of nickel and manganese ferrite nanoparticles. All the samples were calcined at different temperatures from 420 to 570 degrees C. The results of XRD demonstrated the variation of average nanocrystallite size as a function of calcination temperature. Mossbauer spectra of calcined NiFe(2)O(4)nanoparticles at 570 degrees C exhibit two sextets, indicating the samples are ferromagnetic, while calcined MnFe(2)O(4)nanoparticles at 420 degrees C reveal simultaneous presence of two paramagnetic doublets with a central magnetic sextet. The Mossbauer spectroscopy is also applied here for investigating the magnetic hyperfine characteristics and cation distribution of the above-mentioned ferrite nanoparticles. Mossbauer results demonstrate that higher calcination temperature assistances M(2+)ions enter into the octahedral sites, while simultaneously Fe(3+)ions transfer from the octahedral (B) sites to the tetrahedral (A) sites. As the results indicate, magnetic properties of the samples can be attributed to the hyperfine parameters such as hyperfine field and cation distribution. The results of Mossbauer showed the change in hyperfine parameters along with changing temperature and nanocrystallite size.
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