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Articles by Jiban Podder
Total Records ( 3 ) for Jiban Podder
  M. Kamruzzaman , Kamal Uddin Azad and Jiban Podder
  The Zn1-xCdxS (0≤×≤1) thin films have been prepared using a low cost and simple spray pyrolysis technique onto preheated glass substrates at temperature 523 K. The surface morphology, structural, optical and electrical properties of the as-deposited and annealed Zn0.20Cd0.80S films were studied by optical microscopy, Energy Dispersive X-ray (EDX), X-Ray Diffraction (XRD), UV-visible spectroscopy and Vander Pauw method, respectively. The films are shown inhomogeneous surfaces, less defined grain boundaries. The elemental analysis (EDX) revealed that the deposited films are of Zn, Cd and S compositions. X-ray diffraction patterns indicated that the as-deposited films are amorphous in nature and the annealed film is found to be crystalline structure. The average grain size of the annealed film is found to be 8-47 nm and its value increases with the increase of annealing temperature. Various optical constants viz., optical band gap, extinction coefficient, refractive index and dielectric constant have been studied. The direct optical band gap energy of the as-deposited and annealed films is varied from 3.64-2.40 eV and 2.62-2.1 eV, respectively. The dc electrical conductivity increases with the increase of temperature and also with Cd doping.
  Ferdousi Akhtar and Jiban Podder
  Potassium acid phthalate (KAP) crystals are promising materials as good monochromator for the qualitative and quantitative X-ray analysis of light elements like Fe, Al, Mg, F, Si, etc. in a long and middle range. KAP crystal exhibits a rare blend of ionic and molecular properties and has wide application by virtue of their polar nature. KAP is a non centrosymmetric molecular ionic crystal. L-alanine is an efficient organic non Linear Optical (NLO) compound under the amino acid group. L-alanine doped semi organic material like KAP may be the fundamental building block to develop many complex crystals with improved NLO properties. In this paper an attempt has been made to grow large size optically transparent L-alanine doped KAP crystals by slow evaporation solution growth technique and to see the effects of L-alanine into the pure KAP crystals. The chemical composition of the grown crystals was determined by Energy Dispersive X-ray (EDX) and Fourier Transform Infrared (FTIR) Spectroscopy. The structure of pure and L-alanine doped KAP crystals have been examined by powder X-ray diffraction (XRD) study. Optical properties of the grown crystals were studied using UV-visible specrtroscopy. Using Thermogravimetry (TG) and Differential Thermal Analysis (DTA), the decomposition temperature was obtained. Powder XRD study on grown crystals showed that they belong to an orthorhombic system. The transmission in the visible region and the thermal stability of the crystal was found to increase with the doping concentration of L-alanine into the KAP crystal. Optically transparent, large size and thermally stable L-alanine doped KAP crystals were grown successfully in a laboratory for useful application in opto-electronic devices.
  Ferdousi Akhtar and Jiban Podder
  In this study, an attempt has been made to grow large size optically transparent LA single crystals by slow evaporation solution growth technique at room temperature. The chemical composition of the grown crystals was determined by Energy Dispersive X-ray (EDX) and Fourier Transform Infrared (FTIR) Spectroscopy. The structure of pure LA crystal has been examined by powder X-ray Diffraction (XRD) study. Optical properties of the grown crystal were studied using UV-Visible spectroscopy at room temperature. DC electrical conductivity was measured at different temperatures ranging from 35-140°C by conventional two probe method. Powder XRD analysis confirms the orthorhombic structure of the grown crystals. The transmission in the visible region and DC electrical conductivity of the crystal was found to increase with temperature and doping concentration. Optically transparent, large size and electrically conducting LA crystal were grown successfully in a laboratory for useful application in optoelectronic devices.
 
 
 
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