Mössbauer studies and inductive thermal properties of Mgx-doped maghemite nanoparticles

다국어 초록 (Multilingual Abstract)

The Mgx-doped maghemite γ-Fe2O3 (x=0.05, 0.10, 0.15, and 0.20) were investigated, with the aim of enhancing the magnetic hyperthermia properties. We precisely tuned the magnetic and thermal properties of Mgx-doped γ-Fe2O3 prepared using a slightly modifed high-temperature thermal decomposition method. The analysis of X-ray difraction patterns confrmed the spinel phase, crystallite size, and lattice constant. Magnetization measurements performed on Mgx-doped γ-Fe2O3 revealed that the magnetization was maximum for the x=0.15 sample. Accordingly, this sample was exposed to plasma for 30 min.
The thermal properties of Mgx-doped γ-Fe2O3 were studied with temperature rise dependent on magnetic hyperthermia measurements under an externally applied magnetic feld of 25 mT at 112 kHz. The change in magnetic properties before and after plasma treatment was investigated with Mössbauer spectroscopy and further analyzed with one sextet each for the tetrahedral A-site and octahedral B-site. The Fe ion state for each site was determined to be Fe3+ at all temperatures. It was confrmed that the hyperfne magnetic feld of the sample increased after plasma treatment.

참고문헌 (Reference)

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