Articles written in Pramana – Journal of Physics

    • Factors controlling phase formation of novel Sr-based Y-type hexagonal ferrite nanoparticles


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      New Sr-based Y-type nanocrystalline hexagonal ferrites with a nominal chemical composition of Sr$_2$Mg$_2$Fe$_{12}$O$_{22}$ (Sr$_2$Y) were prepared by autocombustion from mixtures of Sr(NO$_3$)$_2$, Mg(NO$_3$ )$_2$·6H$_2$O and Fe(NO$_3$)$_3$·9H$_2$O. The newly prepared Sr$_2$Y nanocrystalline particles were characterized by powder X-ray diffraction (XRD). A well crystalline phase of Sr$_2$Y with hexagonal crystal structure was observed. Fourier transform infrared spectroscopy (FTIR) studies revealed the information about the positions of the ions and their bonds within the lattice structure of the Sr2Y. The chemical elements and their oxidation states in the Sr$_2$Y hexaferriteswere determined using X-ray photoelectron spectroscopy (XPS). The XRD, FTIR and XPS studies confirmed the formation of Sr$_2$Mg$_2$Fe$_{12}$O$_{22}$ hexaferrites. The morphology and porosity of the prepared Sr$_2$Y nanocrystalline Sr$_2$Y hexaferrite particles were studied by field emission scanning electron microscopy. The magnetic properties of Sr$_2$Y hexaferrites showed dependence on the methods of preparation conditions and calcination treatments. The values of coercivity, saturation magnetization and retentivity were in the range of 21.33–19.66 kA m$^{−1}$, 42.44–38.72 emu g$^{−1}$ and 10.05–13.19 emu g$^{−1}$ respectively.

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