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المقاله
1 - Synthesis structural and anti-microbial characterization of nanostructured doped tin oxideAchyutmohan Chaudhury Utsa Debnath Sujay Munshi Goutam Basak Avigyan Dutta Suvadip Masanta Achintya Singha Aritra Banerjee Debtanu Ghosh Partha Chatterjee Apurba Kanti DebJournal of Theoretical and Applied Physics , العدد 1 , السنة 16 , زمستان 2022Nanocrystalline boron doped tin oxide and boron and silver co-doped SnO2 was successfully prepared by using simple sol-gel method. The structural property of as-prepared nanocrystalline materials was investigated by using X-ray powder diffraction, Raman spectroscopy, Fo أکثرNanocrystalline boron doped tin oxide and boron and silver co-doped SnO2 was successfully prepared by using simple sol-gel method. The structural property of as-prepared nanocrystalline materials was investigated by using X-ray powder diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy. The infrared spectra of the prepared samples showed an incorporation of B and Ag in the SnO2 nanocrystals. The X-ray powder diffraction pattern of the as prepared sample demonstrated the formation of a rutile structure of SnO2 nanocrystallites with particle size of 35 nm and 98 nm for boron doped and co-doped samples respectively. The two different Sn-O bond distances are found to be varying in a different manner for the doped samples unlike pristine samples. A significant lattice microstrain was observed for co-doped samples indicating local lattice distortion. The prepared samples showed significant anti-microbial activities against some Gram-Positive & Gram-Negative bacteria in both water and DMSO medium. The prepared materials can be effective for water remediation. تفاصيل المقالة -
المقاله
2 - Applicability of diffraction elastic constants to rationalize anisotropic broadening of X-ray diffraction line profiles from deformed metalsJournal of Theoretical and Applied Physics , العدد 1 , السنة 17 , زمستان 2023A simple method, to rationalize anisotropic X-ray line widths of deformed FCC metallic samples is presented. The method is based on normalized Diffraction Elastic Constant ratio (DECR) within the framework of Stokes Wilson approximation and Gaussian microstrain distribu أکثرA simple method, to rationalize anisotropic X-ray line widths of deformed FCC metallic samples is presented. The method is based on normalized Diffraction Elastic Constant ratio (DECR) within the framework of Stokes Wilson approximation and Gaussian microstrain distribution. The observed dispersion in classical Williamson-Hall plot was significantly reduced if DECR based correction was applied to the integral breadths. Classical grain interaction models such as the Reuss and Reuss-Voigt average (Neerfeld-Hill) models were used to calculate the elastic constants of deformed polycrystals of Aluminium and Copper. It is observed that if non-uniform microstrains are present in the sample (mostly in the case of dislocated crystals) then the Reuss model is more appropriate than the Reuss-Voigt average model and is observed in the case of filed or ball-milled samples of Cu and Al. The non-linearity in the anisotropy corrected Williamson-Hall is indicative of line widening caused by the dislocation. تفاصيل المقالة -
المقاله
3 - Study of deformation microstructure of nickel samples at very short milling times: effects of addition of α-Al2O3 particlesJournal of Theoretical and Applied Physics , العدد 1 , السنة 0 , زمستان 2019AbstractDeformation microstructure of pure Ni powder milled for short duration was studied. The microstructure, as obtained on the basis of Rietveld analysis and microstructural modeling, shows inhomogeneity and consists of ‘heavily deformed’ with twin faults probabilit أکثرAbstractDeformation microstructure of pure Ni powder milled for short duration was studied. The microstructure, as obtained on the basis of Rietveld analysis and microstructural modeling, shows inhomogeneity and consists of ‘heavily deformed’ with twin faults probability and ‘slightly deformed’ components with varying dislocation densities. The modified Williamson–Hall analysis was performed for both the subcomponents with the relevant scaling parameter. Attempts were made to elucidate the nature of dislocation present in the milled samples. The correction due to extra broadening from stacking fault was calculated from the refined values of twin fault probability. In-depth microstructural modeling with restrictedly random distribution of dislocation and a lognormal distribution of spherical particles were done for the two subcomponents to explore the inhomogeneous microstructure. The effect of α-Al2O3 addition is found in reduction in the Ni particle size and yielding more uniform size distribution. It is shown that X-ray line profile analysis is capable of modeling such inhomogeneous microstructure. تفاصيل المقالة -
المقاله
4 - Estimation of lattice strain in alumina–zirconia nanocomposites by X-ray diffraction peak profile analysisJournal of Theoretical and Applied Physics , العدد 1 , السنة 0 , تابستان 2019AbstractZirconia nanoparticles were synthesized by a solution combustion technique. Zirconia nanoparticles were grown inside alumina templates to control the crystal size. The alumina templates were characterized by pores of sizes of approximately 6–8 nm. X-ray diffract أکثرAbstractZirconia nanoparticles were synthesized by a solution combustion technique. Zirconia nanoparticles were grown inside alumina templates to control the crystal size. The alumina templates were characterized by pores of sizes of approximately 6–8 nm. X-ray diffraction line profile analysis using Williamson–Hall method and Warren and Averbach revealed that the alumina templates were characterized by negligible defect-related effect of lattice distortion. Rietveld structure refinement did not reveal any gross difference with the literature reported values for cell parameters ‘a’ and ‘c’ and fractional atomic coordinates x and z for Al and O atoms indicating no large-scale bond deformation. The template X-ray reflections in the nanocomposites are skewed in nature which indicates some distortion of the templates might have taken place. The distortion is, however, plastic in nature which is evident from the higher level of lattice distortion viz. 0.2% of lattice microstrain. تفاصيل المقالة -
المقاله
5 - Microstrain and lattice disorder in nanocrystalline titanium dioxide prepared by chemical route and its relation with phase transformationJournal of Theoretical and Applied Physics , العدد 1 , السنة 0 , تابستان 2020AbstractThe microstructure of nanocrystalline titanium dioxide (TiO2), synthesized by chemical route, is studied from X-ray peak profile analysis and transmission electron microscopy. The broadening of the X-ray diffraction peaks indicates the presence of small crystall أکثرAbstractThe microstructure of nanocrystalline titanium dioxide (TiO2), synthesized by chemical route, is studied from X-ray peak profile analysis and transmission electron microscopy. The broadening of the X-ray diffraction peaks indicates the presence of small crystallites with a significant amount of disorder. The progression of broadening at lower annealing temperatures, suggests the decrease in the strain broadening. The nano-TiO2 was found to transform partially to rutile phase from its nanocrystalline anatase phase when annealed at a temperature of 750 °C. No further appreciable change was observed after annealing at higher temperature. The lattice parameters of the anatase phase change non-linearly with temperature. It was found that there is a discontinuous change in the value of crystallite size, microstrain and thermal parameter values accompanying with the phase transformation. The microstrain associated with the nanocrystalline grain is closely associated with thermal disorder and oxygen z-displacement. The value of thermal parameter reveals a significant deviation of the Ti atom from the regular lattice sites. The present study reveals that nanocrystalline anatase TiO2 prepared by chemical route shows significant static disorder, which decreases with the increase in the annealing temperature along with concomitant phase transformation. تفاصيل المقالة
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