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T. Anjaneyulu,A. T. Raghavender,K. Vijaya Kumar,P. Narayana Murthy,K. Narendra 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.8
Nanocrystalline Ni1−xZnxFe2O4 ( 0.0 ≤ x ≤ 0.8) ferrites have been synthesized by using an oxalic-acid-based precursor method. The X-ray diffraction (XRD) analysis revealed the formation of a single-phase spinel structure at very low annealing temperature. The particle size was observed to decrease with increasing Zn content x. The lattice constants was observed to increase with increasing Zn content x due to large ionic radii of the zinc ion when compared to that of the nickel ion. Magnetic measurements at room temperature revealed that the magnetization did not change monotonically with increasing Zn content x. The coercivity and the remanence were observed to decrease with increasing non-magnetic Zn content x. The observed magnetic properties may be due to a reduction in the number of exchange interactions and the nanocrystalline size with increasing Zn content x.
Shim, J.,Venkata Reddy, Ch.,Sarma, G.V.S.S.,Narayana Murthy, P.,Ravikumar, R.V.S.S.N. Pergamon 2015 Spectrochimica acta. Part A, Molecular and biomole Vol.142 No.-
A simple co-precipitation method has been used for the synthesis of Co<SUP>2+</SUP> and Ni<SUP>2+</SUP>-doped zinc borate nanopowders. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), UV/Vis absorption, Scanning electron microscope (SEM) with EDS and photoluminescence (PL) spectroscopies techniques has been employed for their characterization. Powder X-ray diffraction data reveals that the crystal structure belongs to monoclinic for both as-prepared samples. SEM images showed surface morphology of the prepared samples. Optical absorption spectra showed the characteristic bands of doped ions in octahedral site symmetry. From the optical absorption data crystal field and inter-electronic repulsion parameters are evaluated. The FT-IR spectra showed the characteristic vibrational bands related to ZnO, BO<SUB>3</SUB> and BO<SUB>4</SUB> molecules. Photoluminescence spectra exhibited the emission bands in ultraviolet and blue regions.