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• W2049065770 abstract "Mössbauer measurements were carried out in order to study the influence of the transition metal substitution TM/Fe (where TM = Co, Ni, Mn, and (TM)xFe3−xO4) ranging from 0.1 to 0.9 on the morphology and magnetic properties of ferrite nanoparticles. Chemically prepared magnetite nanoparticles with 13 nm were used as a reference material. The Mössbauer spectrum of the initial magnetite sample show a well-resolved magnetically split patterns connected with tetrahedral (A) positions and octahedral (B) positions. For low concentrations of TM, the relative intensities of the sextet that comes from the iron B position decrease. This means that the Co, Ni, Mn atoms are located preferentially in the B-site of the magnetite. However, the qualitative analysis of the spectra also suggests that Mn and Ni partially occupy the A-site. The increase of the concentration of the substitution transition metal causes broadening of the magnetic part of the spectra and appearance of a doublet in the central part of spectra for all samples. TEM studies show that the incorporation of the Me atoms into the structure causes a decrease of the average particle size. This is also confirmed by XRD. This also means that the blocking temperature decreases and for about Ni/Fe = 0.8 and TM/Fe = 0.9 (for Mn and Co) reaches room temperature. In the case of the nominal 0.9 substitution by Ni, a pure superparamagnetic state is observed, while for Co and Mn some of the particles are still below the blocking temperature, in agreement with the TEM studies." @default.
• W2049065770 created "2016-06-24" @default.
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• W2049065770 date "2012-05-01" @default.
• W2049065770 modified "2023-10-14" @default.
• W2049065770 title "The influence of the transition metal substitution on chemically prepared ferrite nanoparticles – Mössbauer studies" @default.
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• W2049065770 doi "https://doi.org/10.1016/j.cap.2011.12.003" @default.
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