Synthesis, structural, Raman spectroscopic and paramagnetic properties of Sn doped NiO nanoparticles

In this work, Sn doped NiO nanoparticles were synthesized by co-precipitation route to explore the impact of doping on lattice structure, dielectric constant and magnetization. X-ray diffraction analysis confirmed cubic (Fd-3m) structure of all as prepared Sn doped NiO samples. Average crystallite size decreases from 78.2 nm (Ni0.95Sn0.05O) to 64.23 nm (Ni0.8Sn0.2O). Scanning electron microscopy images confirm that nanocrystals have agglomerated spherical morphology. The Fourier transform infrared spectroscopic analysis, the spectral absorption bands at about 460 cm-1 corresponds to metal oxygen bonding. This band is red shifted on enhanced doping of Sn in NiO. Comparing with bulk NiO, the Sn doped NiO samples showed a blue shift. The dielectric constants at about 1 Hz are measured to be about 1.795, 1.030, 0.442, and 0.302 × 103 for Ni1−xSnxO (x = 0.05, 0.1, 0.15, 0.2), respectively. The dielectric constant in nanoparticles of doped Ni1−xSnxO is three orders of magnitude higher as compared to pure NiO ceramics. The nature of magnetization - applied field (M-H) infers paramagnetic behaviour for Sn doped NiO nanoparticles.