Structural and dielectric studies of Zr and Co co-substituted Ni 0.5Zn 0.5Fe 2O 4 using sol-gel auto combustion method

摘要

Zr and Co substituted Ni0.5Zn0.5ZrxCuxFe2?2xO4with x values varies from the 0.0 to 0.4 in steps of 0.08?wt% ferrites synthesized by using sol-gel auto combustion method. The XRD patterns give evidence for formation of the single phase cubic spinel.The lattice constant was initially decreased from 8.3995?? to 8.3941?? with dopant concentration for x?=?0.00–0.08 thereafter the lattice parameter steeply increased up to 8.4129?? fox x?=?0.4 with increasing dopant concentration. The estimated crystallite size and measured particle sizes are in comparable nano size. The grain size initially increased 2.3137–3.0430?μm, later it decreased to 2.2952?μm with increasing dopant concentration. The prepared samples porosity shows the opposite trend to grain size. The FT-IR spectrum for prepared samples shows theFd3m(O7h). The wavenumber for tetrahedral site increased from 579?cm?1to 593?cm?1with increasing dopant concentration and the wavenumber of octahedral site are initially decreased from 414?cm?1to 400?cm?1for x?=?0.00 to x?=?0.08 later increased to 422?cm?1with increasing dopant concentration. The dielectric constant increased from 8.85 to 34.5127 with dopant increasing concentration. The corresponding loss factor was fallows the similar trend as dielectric constant. The AC conductivity increased with increasing dopant concentration from 3.0261?×?10?7?S/m to 4.4169?×?10?6?S/m.