Raman and Mossbauer spectroscopic studies of tungsten doped Ni-Zn nano ferrite

摘要

In this study, tungsten substituted Ni-Zn nano ferrites of the composition Ni_(0.5)Zn_(0.5)W_xFe_(2-x)O_4 with x = 0.0, 0.2, 0.4 have been synthesized by a co-precipitation method. The prepared samples were pre-sintered at 850 ℃ and then annealed at 1000 ℃ for 3 h each. The structural, morphological, optical and magnetic properties of these samples were studied by using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spec-troscopy (RS) and Mossbauer spectroscopy (MS). XRD revealed the formation of spinel single-phase structure with an average crystallite size of 53-60 nm. Fourier transform infrared spectroscopy show two prominent peaks primarily due to the tetrahedral and octahedral stretching vibrations in the range of 400-600 cm~(-1) Raman spectra indicate first order three Raman active modes; (Al g + Eg + T2 g) at around 688, 475 and 326 cm~(-1) Mossbauer spectroscopy reveals that substitution of W~(3+) for Fe~(3+) cation results in reduction of total magnetic moment and consequently the net magnetization.