[en] Varying formers compositions of fast ionic conducting silveraresenotellurate (SAT) quaternary glasses were prepared by melt quenching technique. X-ray diffraction (XRD) measurements were carried out and confirmed the glassy nature of all SAT samples from the observed peak free XRD spectra. Fourier transform infrared (FTIR) spectra were recorded for all SAT sample pellets and confirmed the formation of structural coordination in all compositions of SAT compounds. Differential scanning calorimetric (DSC) measurements were made and estimated glass transition temperature (T_g) for all SAT samples. Impedance measurements were made on all SAT samples from 40 Hz to 100 KHz. Impedance data were analyzed using Boukamp equivalent circuit software and evaluated conductivity of each composition of SAT system. The observed variation of conductivity with former composition is explained by correlating XRD, FTIR, DSC and conductivity results with available theoretical models

[en] Densified xerogels of lithium borosilicate (LBS) were synthesized through sol-gel process by varying modifier to formers (m/f) ratios. XRD and FTIR spectra were recorded for dried LBS gel samples heat-treated at different temperatures and the gel to glass to crystalline changes were studied. Also, all LBS samples were characterized by XRD, FTIR and DSC techniques. Impedance measurements were made on all LBS samples at different temperatures and the impedance data were analyzed using Boukamp equivalent circuit software. Conductivity of each m/f ratios of LBS samples were calculated from the analyzed impedance data and 20% Li₂O-80% [0.2 B₂O₃ + 0.8 SiO₂] composition showed the best conductivity σ = 8.83 (±0.02) x 10^-8 Scm^-1 at 443 K. The activation energy (E_a) is obtained from the temperature dependent of conductivity data fitted to Arrhenius equation and it is found to be 0.64 eV (±0.02). The observed variation of conductivity with m/f ratios of LBS samples was explained using weak electrolyte model

[en] Quaternary silvervanadotellurite (SVT) glasses of various formers compositions (x) 60%AgI-26.67%Ag₂O-13.33%[(1-x)V₂O₅ +(x)TeO₂]; x 0.0-1.0 in steps of 0.1 were prepared by a melt quenching technique. All the prepared SVT glasses were characterized by X-ray diffraction, FTIR and DSC measurements to confirm the glassy/amorphous nature, incorporation of tellurite in vanadium oxide glassy matrix and their glass transition temperature (T_g), respectively. Complex impedance measurements were made at room temperature (RT) as well as low temperatures (99-242 K) on SVT glasses and impedance data were analyzed using the Boukamp equivalent circuit software to obtain conductivity at each temperature. Low temperatures conductivity studies were made only for the high conducting composition (x 0.6) of SVT glasses. Activation energy (E_a) is obtained from Arrhenius plots of temperature dependent dc conductivity and it is found to be 0.25 eV for high conducting SVT glass. The ac conductivity was calculated using the impedance data of SVT glass measured at low temperatures and analyzed with Jonscher's Universal Power law (JUP). The obtained power law exponent s for the SVT glass was found to exhibit a non-linear behavior with temperature and its nature of ion relaxation was explained using the DCR model. The dielectric and electric modulus (M* = M' + iM'') data was calculated using impedance data for the x = 0.6 composition of SVT glass measured at low temperatures

[en] Seeds of pink flowered (PF) and white flowered (WF) Catharanthus roseus were soaked in distilled water for 24 h and treated with gamma rays and 0.1% EMS separately and in combination. Six types of chlorophyll mutations, viz., xantha, albina, chlorina, viridis, maculata and tigrina were recovered to M₂ generation of both forms. The frequency of chlorophyll mutations was found to be dependent on the dose, of gamma rays and duration of treatment with EMS. Higher frequency of chlorophyll mutations was noticed in PF, which is mutagenically more sensitive than WF. It was also noticed that the combination treatments of gamma rays and EMS enhanced the frequency of chlorophyll mutations

[en] The Lanthanum oxide (La₂O₃) has wide rage of applications, such as catalysts, high K gate dielectric material, optical filters, etc., due to its attractive properties. Various synthesis routes are used for the preparation of the nano crystalline rare earths metal oxides. Sol gel combustion route is found to be better synthesis method for getting the low particles size metal oxide powders with less agglomeration. Usually the Hexagonal lanthanum oxide has less chemical stability. But the hexagonal lanthanum oxide prepared by sol gel combustion is more chemical stability. Hence, in the present paper, we report the synthesis of lanthanum oxide nano particles by sol gel combustion process and characterized by XRD, TG/DTA, FTIR and SEM

[en] Rare earth Ternary oxides have potential applications in diverse fields such as in oxygen ion conductors, catalysts for oxidation, magnetohydrodynamic (MHD) generators and thermoelectric materials. There have been a number of studies on rare earth oxides focusing on its electronic, magnetic, catalytic and thermoelectric properties. Various types of wet chemical methods were used for the preparation of different types of nanocrystalline materials. Of which Acrylamide assisted combustion is found to be one of the suitable processes for the synthesis of different types of nanocrystalline materials. Hence, the present paper deals with the Synthesis of nanocrystalline Sr²⁺ doped dysprosium oxide (Dy₂O₃) by using Acrylamide assisted combustion process and Characterized by XRD, FTIR and TG/DTA techniques. Also, the conductivity and activation energy of the Sr²⁺ doped Dy₂O₃ sample were evaluated by analyzing the impedance data measured at different temperatures in the frequency range of 1 Hz to 1 MHz.

[en] Transition metal ferrites with general formula AB_2O_4 (A=Co, Cu, Mn, Zn, B=Fe"+"3) could be used as an anode materials in lithium ion battery (LIB), because, lithium ion batteries fabricated using ferrite materials show the high capacity than commonly used graphite. The ZnFe_2O_4 with cubic spinel structured material was prepared by acrylamide assisted citrate combustion process. Phase, structural coordination and thermal behavior of the prepared ZnFe_2O_4 were confirmed by powder X-ray diffraction, FTIR spectra and TG/DTA thermogram respectively. Morphology and specific surface area of the ZnFe_2O_4 were identified by SEM and BET surface analyzer respectively and its conductivity studies were made through impedance spectroscopy

[en] The present work describes the synthesis, using sol-gel process, and characterization of the rare earth based nanocrystalline metal silicate (La₁₀(SiO₄)₆O₃) for the Intermediate Temperature Solid Oxide Fuel cell applications

[en] Hybrid nanocomposite [poly(vinylidene fluoride -co- hexafluoropropylene) (PVdF-co-HFP)/magnesium aluminate (MgAl₂O₄)] fibrous polymer membranes were prepared by electrospinning method. The prepared pure and nanocomposite fibrous polymer electrolyte membranes were soaked into the liquid electrolyte 1M LiPF₆ in EC: DEC (1:1,v/v). XRD and SEM are used to study the structural and morphological studies of nanocomposite electrospun fibrous polymer membranes. The nanocomposite fibrous polymer electrolyte membrane with 5 wt.% of MgAl₂O₄ exhibits high ionic conductivity of 2.80 × 10⁻³ S/cm at room temperature. The charge-discharge capacity of Li/LiCoO₂ coin cells composed of the newly prepared nanocomposite [(16 wt.%) PVdF-co-HFP+(5 wt.%) MgAl₂O₄] fibrous polymer electrolyte membrane was also studied and compared with commercial Celgard separator

[en] A novel fibrous polymer blend [(100-x) % P(VdF-co-HFP)/x % PMMA, x = 10, 20, 30, 40, 50] electrolyte membranes were prepared by electrospinning technique. Structural, thermal and surface morphology of all the compositions of electrospun polymer blend membranes were studied by using XRD, DSC & SEM. The newly developed five different compositions of polymer blend fibrous electrolyte membranes were obtained by soaking in an electrolyte solution contains 1M LiPF_6 in EC: DEC (1:1,v/v). The wet-ability and conductivity of all the compositions of polymer blend electrolyte membranes are evaluated through electrolyte uptake and impedance measurements. The polymer blend [90% P(VdF-co-HFP)/10% PMMA] electrolyte membrane showed good wet-ability and high conductivity (1.788 × 10"−"3 Scm"−"1) at room temperature