X-Ray Diffraction and Raman Scattering Study Of Cr-doped ZnFe_2O_4 Spinel Ferrites

摘要

XRD and Raman scattering measurements were made on polycrystalline ZnFe_(2-x)Cr_xO_4 (x = 0.0, 0.1, 0.2) spinel ferrites as prepared by solid-state reaction route. Rietveld refined X-ray diffraction pattern confirmed the formation of single-phase and are indexed in cubic structure with Fd3m space group. Slight reduction in the lattice parameter from 8.435 to 8.410 A, with Cr~(3+) ion substitution has been observed. From Raman scattering spectra, the modes of ZnFe_(1.9)Cr_(0.1)O_4 and ZnFe_(1.8)Cr_(0.2)O_4 are shifted towards the lower frequency side as compared to ZnFe_2O_4, this red shift is attributed to higher atomic mass of Zn (65.39 amu) as compared to Fe (55.84 amu).