Glycine Potassium Sulphate (NH2CH2COOH.K2SO4) GPS-I & GPS-II crystal were grown from aqueous solution by slow evaporation technique at room temperature. The molecular weight proportion of Glycine and potassium sulphate in GPSI it is 1:1 Ratio and in GPS –II it is 3:1 ratio. These crystals in powdered form were subjected to thermal analysis on general V2.2A DUPONT 9900 system with DSC cell attachment. It is observed that the decomposition temperature for GPS-I in TG/DTG curve is 538k with rate 278k /min & in DSC curve it is 513.48k with rate 283k /min. For GPS –II crystal the decomposition temperature is 544.99k with rate of 278k /min. in TG/DTG curve is 513k with rate 283k/min & in DSC curve. The small variation in TG/ DTG is due to different heating rate confirming characteristics decomposition temperature around 513k also shown by DSC data. The loss in weight decreases slightly from 1:1 to 3:1 which is due to loss of water molecules from Glycine. DSC studies reveal no ferroelectric transitions in the temperature range from room temperature to 593k. The heat flow increases from GPS-I to GPS-II. All the reactions are exothermic. The results are also compared with Glycine potassium fluoride, G1KF and G3KF crystals, the implications are discussed.
Sustainable management of natural resources in small scale agriculture is a less debated issue, especially its governance aspects. Focusing on selected villages where a policy towards sustainable agriculture has been introduced in Karnataka - a state showing signs of agrarian distress; the paper discusses the governance aspects in natural resources management for small scale farming. Based on focused group discussions with farmers, officials and voluntary workers, the study indicates benefits for small farmers and less developed districts from the emerging policy trend towards sustainable agriculture. We also elicit governance factors responsible for outcomes of such policies. Inclusive design and participatory governance emerge crucial along with efficacy of government officials and completeness in implementation.
Nanocrystalline Copper sulphide (Cu2S) thin films have been grown on glass surface by Modified chemical bath deposition method (M-CBD). The optimized preparative parameters including temperature, pH of solution, immersion time, immersion cycles, have been optimized for fine nanocrystalline film growth. As deposited nanocrystalline Copper sulphide (Cu2S) thin films have been made characterized for the structural, surface morphological, optical and electrical properties using X-ray diffraction (XRD), Scanning electron microscopy (SEM), UV-VIS Spectra and d.c. two point probe method.
A Novel chemical bath deposition (CBD) method has been developed to deposit semiconducting nanocrystalline copper sulphide (Cu2S) thin films on ordinary glass substrates with different thicknesses. The deposition bath consists of aqueous copper chloride (CuCl2), ammonia (NH3) and thiourea [SC(NH2)(2)]. It is found that the deposition parameters significantly influence the quality and the thickness of Cu2S films. The films were uniform and adherent to glass substrates. The deposited films have been characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), optical absorption and electrical resistivity. The effect of film thickness on the optical, structural and electrical properties has been studied. The shift of 0.46 eV in the optical band gap energy (E-g) and decrease in electrical resistivity from 6.463 x 10(-2) to 8.973 x 10(-3) Omega-cm and increase in the grain size of Cu2S crystallites from 30 to 250 nm were observed when the film thickness was varied from 130 to 250 nm.
Silver doped CdS0.2Se0.8 thin films of different concentrations were grown by simple and economical chemical bath deposition technique and later on characterized for optoelectronic and physicochemical properties. The Xray diffraction (XRD) patterns of undoped and doped sample indicates polycrystalline nature with hexagonal structure. Scanning electron microscopy (SEM) micrograph showed uniform morphology with cabbage type structure for undoped film and leaf-like structure for doped films over the entire glass substrate. Room temperature absorbance for 1 wt% doping concentration of silver showed an excitonic peak which confirms the size quantization of the particle. I-V characteristic for undoped and doped film shows ohmic and Schottky junction behavior.
The grown crystals of glycine were used for edge dislocation. Etchant A [85% formaldehyde, 13% distilled water, 2% nitric acid (analar grade)] and etchant B [Propionic acid and formic acid in the volume ratio 9:1] reveals the sites of edge dislocations on (010) cleavage planes of glycine Potassium Sulphate (GPS) crystals. Ethyl alcohol (not less than 99%) was used as rinsing agent. It is found that the etchant B is superior to etchant A, as the surface dislocation with etchant B along [110] direction is less than with etchant A. n-propyl alcohol with distilled water in the volume ratio 3:1 is reported as chemical polishing agent which remove the surface layer at about 0.4 μm. min-1. The structure of isolated pits form on the surface and of those formed along low angle grain boundaries is the same, which suggest that pits are probably formed at the site of edge dislocations. The density of pits of low angle grain boundary remains the same after removing the surface layer of about 4 μm. The implications are discussed
Nanocrystalline zinc sulphide (ZnS) thin films have been grown on glass surface by modified chemical bath deposition method (M-CBD). The optimized preparative parameters including temperature, pH of solution, immersion time, immersion cycles, have been optimized for fine nanocrystalline film growth. As deposited nanocrystalline zinc sulphide (ZnS) thin films have been characterized for the structural, optical and electrical properties using X-ray diffraction (XRD), UV-Vis spectra and de electrical conductivity by two point probe method.
Grown solution of glycine potassium sulphate (GPS) crystals were subjected for topographical studies. Cleavage face of ferroelectric glycine potassium sulphate has been chemically and thermally etched. Rows of equally spaced pits have been observed. It is noted that the geometry of line do not change but they are different with different intensity. Faint line has perfect crystallographic orientation are the Ferro-electric domain wall. Domain wall do not penetrate through the body of the crystals. There is no co-ordination between domain and dislocation interaction. Geometry does not Geometry do not change beyond transition temperature support domain dislocation interaction.
Building upon a larger research project at four sites in the Western Ghats of peninsular India, this study examines the link between stream flow, agricultural water use and economic returns to agriculture. The study attempts to simulate the likely impacts of regeneration of a degraded forest catchment on stream flow and the consequent impact on irrigation tankbased agriculture in a downstream village.
Chemical deposition method, namely, modified chemical bath deposition (M-CBD) has been used to deposit copper thiocyanate (CuSCN) thin films. The CuSCN thin films were deposited onto glass and FTO coated glass substrates from an aqueous medium at room temperature. To obtain good quality of thin films, preparative conditions such as concentration, pH of precursor solution and adsorption, reaction and rinsing time durations were optimized at room temperature. The structural, morphological, optical, electrical and photoelectronchemical (PEC) properties of the films were investigated. X-ray diffraction (XRD) patterns of CuSCN thin films reveals that the films have a rhombohedral structure. The band gap was found to be 3.9 eV. The PEC studies showed that the material is a wide band gap. PACS: 81.15.z; 68.55.-a; 78.20