http://nopr.niscair.res.in/handle/123456789/1947 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/2238 Title: An investigation of ion transport properties in silver phosphate glassy systems doped with Fe, Mn and Zn chlorides <br/> <br/>Authors: Das, S S; Singh, N P; Srivastava, Vibha; Srivastava, P K <br/> <br/>Abstract: The ion transport properties of silver phosphate glasses doped with different weight percent of chlorides of iron, manganese and zinc have been studied .The synthesized glasses have been characterized by X-ray, FTIR, differential scanning calorimetry, transference number measurements and electrical conductivity studies. Their amorphous nature, structure, glass transition temperature, transference number and ionic conductivity have been investigated. The variation of room temperature conductivity with dopant composition has been found to be controlled by the variation in the amount of dopant ions (Fe³⁺, Mn²⁺ and Zn²⁺) present in the glass samples and the trend is σ ( – ZnCl₂) > σ ( – MnCl₂) > σ (– FeCl₃) The Ag₂O–P₂O₅–(10%) ZnCl₂ glass system yielded maximum while the system Ag₂O–P₂O₅–(10%) FeCl₃ exhibited the lowest conductivity values respectively .The temperature variation of conductivity has been found to follow an Arrhenius relation. The results of ion transport studies are in accordance with the variation of glass transition temperature and changes in the structure of Ag₂O–P₂O₅ glass by the addition of Fe, Mn and Zn ions as studied by infrared spectroscopy. <br/> <br/>Page(s): 256-264 Thu, 29 May 2008 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/2237 Title: Comparison of properties of silver-tin oxide electrical contact materials through different processing routes <br/> <br/>Authors: Pandey, Asmita; Verma, P; Pandey, O P <br/> <br/>Abstract: In the present work silver-tin oxide (Ag-SnO₂) electrical contact materials have been prepared by different processing techniques, viz., powder metallurgy (P/M), internal oxidation (I/O) and internal oxidation of alloyed powders (IOAP). The influence of processing routes on the physical properties such as electrical conductivity, density and microstructure of these Ag-SnO₂ composite materials are compared. The microstructural study reveals that internal oxidation (I/O) technique provides most uniform structure. <br/> <br/>Page(s): 236-240 Thu, 29 May 2008 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/1984 Title: Relationship between the electric spark sensitivity and detonation pressure <br/> <br/>Authors: Keshavarz, M H <br/> <br/>Abstract: A new method for the prediction of electric spark sensitivity of polynitro arenes through maximum obtainable detonation pressure has been proposed. This work uses two additional factors, which depend on the contribution of some structural parameters. Twelve polynitro arenes as training set were applied to optimize new correlation and twenty two polynitro arenes as test set were also used to check the validity of the method. The calculated electric spark sensitivities have a root mean square (rms) deviation of 2.27 J and a maximum deviation of 4.48 J from experimental data for training set. The rms and maximum deviations of predicted electric spark sensitivities from experimental values for test set are 2.28 and 4.77 J, respectively. <br/> <br/>Page(s): 281-286 Thu, 29 May 2008 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/1983 Title: n-HgxCd₁₋xSe thin film electrodes for photoelectrochemical applications <br/> <br/>Authors: Pujari, V B; Dhage, D J; Deshmukh, L P <br/> <br/>Abstract: Mercury cadmium selenide (HgxCd₁₋xSe) thin film semiconductor photoelectrodes of various compositions (0 ≤ x ≤ 0.2) are fabricated on glass and stainless steel substrates by a simple chemical bath technique. The different preparation parameters and deposition conditions are optimized to yield quality samples. By increasing the Hg-content in host CdSe- lattice, an optical gap (Eg) of the alloyed semiconductor is reduced from 1.72 to 1.06 eV, which corresponds to maximum absorption in the visible and near infra-red regions of solar spectrum. The photoelectrochemical (PEC) cells are then fabricated and studied for their performance through the various parameters. It has been observed that the flat band potential (Vfb) increased with electrode composition, x and reached a maximum at x = 0.01. The variations in the photopotential (Vph) and photocurrent (Iph) are studied as a function of the electrode composition. Both Vph and Iph are found to be boosted significantly and are explained on the basis of the electrode materials properties. <br/> <br/>Page(s): 275-280 Thu, 29 May 2008 22:58:59 GMT