Radiation-induced modifications in structural, electrical and dielectric properties of Ti~(4+) ions substituted Li_(0.5)Fe_(2.5)O_4 nanoparticles

摘要

In the present study, Li~(0.5+0.5x)Ti~(x)Fe~(2.5−1.5x)O~(4)(where, 0.0 ≤ x ≤ 1.0 in step of 0.2) nanoparticles were synthesized via sol–gel auto combustion technique. The nanocrystalline samples exposed to_(60)Co gamma (γ)-radiation of 5 Mrad dose, to understand its effect on structural, morphological, electrical and dielectric properties. The nanoparticles characterized by X-ray diffraction and field emission scanning electron microscopy (FE-SEM) techniques before and after irradiation. The irradiated samples give good crystallinity, and small crystallite size (~ 25 nm) as compared to pristine samples (~ 45 nm) and the lattice parameter gets decreased up to ~ 0.01 Å. The FE-SEM images of pristine samples show spherical morphology, whereas irradiated samples showed some cracks in it. Temperature-dependent conductivity measured by two probe technique reveals that the conductivity decreases (upto ~ 5 × 10_(−5)Ω_(−1)) after irradiation by obeying Ohmic nature. The dielectric measurements show the strong influence of irradiation on all the samples.