http://10.9.150.37:8080/dspace//handle/atmiyauni/275 2026-04-27T18:51:04Z http://10.9.150.37:8080/dspace//handle/atmiyauni/2198 Title: Structural, optical, dielectric relaxation, complex impedance and modulus spectroscopic studies of pure and glutamic acid doped potassium dihydrogen phosphate Authors: Ladani, Hepi Abstract: The slow evaporation procedure is used to develop KDP crystals with both pure and doped by glutamic acid. The powder XRD patterns reveal single phase, lower lattice strain and enhancement of peak intensity due to doping in KDP. Doping is observed to increase the crystals' nonlinear property, second harmonic generating efficiency. The UV–VIS spectra indicate slight decrement in the transmittance due to doping. The energy band gap is evaluated from Tauc’s plot and KM theory and slight reduction is observed on doping. The refractive index of pure and doped KDP crystals within visible region is observed to vary between 1.52 to 1.64. The dielectric constant and loss have shown normal behavior with respect to applied frequency of electric field at room temperature. The complex impedance and modulus plots show single semicircle for pure and doped KDP due to grain contribution only and exhibits non-Debye type relaxation. The Jonscher’s power law is applied to ac conductivity data and ideal long-range pathways and diffusion limited hopping mechanism is confirmed. 2023-12-01T00:00:00Z http://10.9.150.37:8080/dspace//handle/atmiyauni/2156 Title: Photocatalytic applications of Nickel pyrophosphate nano-particles in wastewater treatment Authors: Joshi, M. J.; Solanki, P. D.; Jethwa, H. O. Abstract: Nickel pyrophosphate (Ni2P2O7) is an interesting material with use in energy storage devices and super-capacitors. The surfactant-mediated approach is used to synthesize nickel pyrophosphate nano-particles and further analyze using Powder XRD and TEM for confirmation of nano-structured nature. Methylthioninium chloride or popularly known methylene blue (MB) organic dye is chosen for the photo-catalytic study using nickel pyrophosphate nano-particles. Due to large industrial use, the MB is found in wastewater and hence, the decomposition of MB has become a degradation standard practice. The photo-degradation of MB by nickel pyrophosphate nano-particles is confirmed through several analyses, viz., wastewater analysis, total organic carbon (TOC) analysis, ion chromatography, and UV–Vis. The results indicate that MB degrades in lower-molecular weight leuco dye. This gives an important application of synthesized nickel pyrophosphate nano-particles in an organic pollutant removal. To evaluate the electrochemical properties of nickel rophosphate nano-particles, the electrochemical impedance (EIS) spectral analysis is reported. Nickel pyrophosphate nano-particles are found to be potential photo-catalysts for MB dye degradation. 2024-06-01T00:00:00Z http://10.9.150.37:8080/dspace//handle/atmiyauni/2151 Title: The Infl uence of Isoleucine on Structural, Optical andElectrical Properties of Lithium Dihydrogen PhosphateCrystal Authors: Ladani, H.K.; Vadhel, K.V.; Mankad, D.B.; Pandya, V.J. Abstract: The present investigation systematically explores the impact of isoleucine doping on the structural,optical, and electrical properties of lithium dihydrogen phosphate (LDP) crystals. Pure andisoleucine-doped LDP crystals with various dopant concentrations (0.3, 0.6, and 0.9 wt%) have beensynthesized using the slow solvent evaporation technique. Structural analysis utilizing X-raydiffraction revealed a reduction in crystallite size and a reduction in the compressive and tensilestrains induced by isoleucine integration. Optical examinations showcased a gradual reduction in thebandgap energy alongside an increase in the Urbach energy with escalating dopant concentration,indicating increase in structural disorder. Moreover, the extinction coeffi cient, optical conductivity,and refractive index show an upward trajectory with doping, while optical density exhibits an inverse correlation. Electrical characterization that include dielectric and impedance spectroscopic methods showed a decline in DC conductivity and a rise in grain resistance, attributable to diminished charge carrier mobility and density. The power law exponent indicated ideal long range path ways and diffusion limited hopping mechanism. The relaxation kinetics exhibited deviation from ideal Debye behavior, with the stretch exponent parameter signifying an improvement in relaxation dynamics at higher doping levels. The complex impedance and modulus plot analysis showed the dominancy of grain relaxation mechanism within the range of frequency studied. In summary, this exhaustive investigation shows the intricate interplay between isoleucine doping and the diverse properties of LDP crystals, offering valuable insights for potential applications. 2024-01-01T00:00:00Z http://10.9.150.37:8080/dspace//handle/atmiyauni/2060 Title: A.C. Permittivity and conductivity studies of Ni‑doped Pb levo‑tartrate crystals Authors: Pandya, N. D.; Joshi, J. H.; Dave, D. J.; Hajiyani, R. R.; Jethva, H. O.; Joshi, M. J. Abstract: Lead Tartrate finds several applications such as an additive in gasoline to prevent knocking in motors, in synthesis of chiral molecules, and a combustion catalyst in solid propellant. To modify the properties of PbLT (lead levo-tartrate), the Ni addition is done. The lead nitrate and nickel nitrate solutions are used to grow Pb–Ni levo-tartrate (PbNiLT) crystals in silica gel medium. The amount of Ni and Pb is determined by EDAX. Powder XRD reveals the outcome of Ni addition on the lattice constants of PbLT crystals. The presence of certain functional groups is noticed by FTIR spectra. TGA suggests that Ni increases the thermal stability of PbNiLT crystals compared to PbLT crystals. The A.C. electrical characteristics of PbLT and PbNiLT such as dielectric, impedance, and modulus spectroscopy are studied. This reveals microstructural effect by adding Ni in PbLT crystals, and from the complex impedance Nyquist plots, the grain resistance R g , grain capacitance C g , and relaxation frequency values are obtained along with fitting with equivalent R–C circuit. The behavior of relaxation mechanism prevailing in the PbLT and PbNiLT crystals is explained 2024-01-01T00:00:00Z