P.S.V. Subba Rao

Mössbauer study of the system Ni0.65Zn0.35Fe2−xScxO4

Abstract Mossbauer study of the system Ni 0.65 Zn 0.35 Fe 2− x Sc x O 4 , with x values ranging from 0.00 to 0.25, has been conducted at room temperature to analyze the site occupancy of Sc 3+ ions. The results indicated that all of the scandium ions preferentially occupy octahedral sites for x values up to 0.10, whereas for the subsequent increase in x , a small part of the scandium ions occupy tetrahedral sites as well. Ionic distribution for the system is given. The observed variations in the hyperfine magnetic fields and peak–area ratios, isomer shifts and linewidths with composition are discussed.

Structural and impedance studies of doped LLT materials for electrolytes of lithium-ion batteries

In order to attain high conductivity, we have to investigate the structural and conductivity studies of novel polycrystalline Lithium Lanthanum Titanate with doping of pentavalent Niobium. The compound Li0.5-xLa0.5NbxTi1-xO3 (x = 0, 0.05, 0.1 and 0.15) (LLTN) having perovskite Cubic structure synthesized by ceramic technology. The crystalline phase identification and determination of lattice parameters of each sample were carried out by X-ray diffraction (XRD) analysis. The Raman Spectra were performed to understand the bonding nature of these materials. The lithium-ion conductivity and dielectric constant of the compound have been determined with AC impedance spectroscopy.

Synthesis and structural characterization lithium nickel oxide at different temperatures

In the last few years, LiNiO2 has been intensely investigated because of its comparatively low cost, large reversible capacity and environmental advantages over LiCoO2. In the present task LiNiO2 precursor was synthesized by a solid state reaction method under the flow of air at different temperatures 700 °C, 750 °C and 800 °C for 24 hours to achieve better phase formation. From the x-ray diffraction data, the intensity versus diffraction angle peak indicates that the compound crystallizes as a rhombohedral system (space group R3m). The lattice constants and crystallite sizes are computed from XRD data. The FTIR spectra are recorded in KBr pellets in the 4000-500 cm−1 range. The particle morphology of the compound was observed using a scanning electron microscope (SEM).