In the present work, the effect of co-doping of rare earth (Re3+), La and Er cations on the
physical and dielectric performance of Cd-Zn spinel ferrites fabricated by sol-gel auto
combustion method is reported. The prepared ferrites were doubly calcinated at 550 ℃ and
750 ℃ for 2 hours and 8 hours, respectively. The obtained samples were investigated using
XRD, FTIR and dielectric measurements. XRD powder patterns verified the single-phase
growth of spinel structure of all the as-synthesized ferrites with Fd-3m space group. The
obtained results revealed that the Lattice constant reduces with increasing Er3+
concentrations, while crystallite size showed increasing behavior with increasing Er3+
concentration. FTIR results revealed the existence of two major absorptionbands i.e. low
frequency bands in range 405-428 cm-1 and high frequency bands in range 523- 550 cm-1
which are evidence of spinel structure formation. LCR measurements are used to investigate
the impact of co-doping of La3+ and Er3+ on the various dielectric parameters of prepared
samples in response to frequency. Dielectric constant and loss decreased with the
incorporation of Er3+, while an increase in ac conductivity was observed. The observed
properties reveal that the prepared materials are suitable candidates for application in the
high-speed microwave and radio frequency devices.
