V Veeraiah
Articles written in Bulletin of Materials Science
Volume 36 Issue 6 November 2013 pp 1115-1119
Evidence for high ionic conductivity in lithium–lanthanum titanate, Li0.29La0.57TiO3
D Tirupathi Swamy K Ephraim Babu V Veeraiah
Lithium–lanthanum titanate, Li0.29La0.57TiO3, is prepared by solid-state reaction method and it is furnace-cooled to room temperature. X-ray diffraction results indicated that the compound has tetragonal perovskite-like structure and the lattice parameters are determined as 𝑎 = 3.8714 Å and 𝑐 = 7.7370 Å. The average grain size is found to be 5 𝜇m from SEM micrograph. The analysis of FTIR and Raman spectra of the sample supported tetragonal structure inferred from XRD data. The impedance spectrum of the sample is separated into bulk and grain boundary parts by analysing the impedance data. The high bulk ionic conductivity is reported as 1.12 × 10-3 S cm-1 at room temperature. D.C. conductivity measurements indicate that the compound is a good ionic conductor.
Volume 37 Issue 2 April 2014 pp 287-293 Electronic Supplementary Material
Structural and optoelectronic properties of cubic perovskite RbPbF3
K Ephraim Babu N Murali D Tirupathi Swamy V Veeraiah
The structural and optoelectronic properties of cubic perovskite RbPbF 3 are calculated using all electrons full potential linearized augmented plane wave (FP-LAPW) method. The calculated lattice constant is in good agreement with the experimental result. The calculated band structure shows a direct band gap of 3.07 eV. The contribution of different bands is analysed from the total and partial density of state curves. We identified hybridization of Pb 𝑠, Pb 𝑝 states with F 𝑝 states in the valence bonding region. Calculations of the optical spectra, viz., the dielectric function, optical reflectivity, absorption coefficient, real part of optical conductivity, refractive index, extinction coefficient and electron energy loss are performed for the energy range of 0-30 eV. Based on the direct bandgap, as well as other optical properties of the compound, it is predicted that this material is useful for vacuum-ultraviolet-transparent (VUV-transparent) applications.
Volume 37 Issue 4 June 2014 pp 883-888
A Venkateswara Rao V Veeraiah A V Prasada Rao B Kishore Babu B Swarna Latha K Rama Rao
Vanadium substituted LiTi2(PO4)3 (LTP) samples of composition of Li1–𝑥[Ti2–𝑥V𝑥](PO4)3 (𝑥 = 0.0, 0.05, 0.10 and 0.15) have been prepared by solid-state reaction method. XRD data for these compositions indicated the formation of phase pure materials of rhombohedral structure with space group 𝑅$\bar{3}$𝑐 (167). Microstructural studies by scanning electron microscope indicated particle size in the range of 0.5–1 𝜇m. Electrochemical impedance studies showed that ionic conductivity is high for 𝑥 = 0.10 composition. a.c. and d.c. conductivity results up to 573 K are in accordance with the Jonscher’s power law. Cyclic voltammetry study showed its electrochemical stability in the voltage range from 0.5 to 3.5 V.
Volume 43, 2020
All articles
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Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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