Faculty Publications
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Item Basic alloying elements used in high-entropy alloys(De Gruyter, 2023) Chandrakar, R.; Sridhar, K.; Sahu, P.S.; Chandraker, S.; Gupta, P.K.The mechanical characteristics of high-entropy alloys (HEAs) can be improved by a variety of alloying elements; however, it is unclear how the alloying of various elements affects the changes in the microstructure and the mechanical properties of HEAs. The alloying elements like Cr, V, Ti, Zr, and Hf regulate the melting temperature, lattice constant, and the mass density of HEAs. The electrical structure and the mechanical characteristics of HEAs are significantly impacted by the valence electron concentration. High VEC can enhance mechanical characteristics while decreasing its ductility. Ti significantly affects ductility, while Cr-alloying significantly affects the mechanical characteristics of HEAs. Our findings offer the fundamental understanding required to direct the development of HEAs with superior mechanical characteristics. © 2023 Walter de Gruyter GmbH, Berlin/Boston. All rights reserved.Item Synthesis, growth and characterization of 1-(5-chlorothiophen-2-yl)-3-(2,4, 5-trimethoxyphenyl) prop-2-en-1-one single crystal: A potential NLO material(2011) Prabhu, A.N.; Upadhyaya, V.; Arasalike, A.; Maddasani, M.; Manjunatha, K.B.; Umesh, G.A potentially useful nonlinear optical (NLO) organic material, 1-(5-chlorothiophen-2-yl)-3-(24,5-trimethoxyphenyl)prop-2-en-1-one(CTTMP), has been synthesized and grown as a high-quality single crystal by the slow evaporation technique. The grown crystals were characterized by UV-visible spectroscopy. The material has thermal stability up to its melting point. Single beam Z-scan technique was employed to study the third order NLO properties of the material. © 2011 American Institute of Physics.Item BaCu(C2O4)2 · 6 H2O is triclinic, P1, with a = 6.5405(9), b = 9.202(3), c= 10.939(1) Å, ? = 8546(2), ? = 79.22(1), ? = 80.45(2), V = 636.99(1) Å3, Z=2, D0, = 2.14, Dc = 2.465 g · cm-3, R = 0.074. wR = 0.0746 for 2219 significant reflections |F0| = 6.0?F0. The barium has eleven coordinations and the coordination polyhedra is a capped antiprism. Six water oxygen atoms are coordinated whereas the other five are coming from the oxalate group. In the unit cell the molecules form a polymeric network. One lattice water molecule belongs to the coordinating water. The barium oxygen distances vary from 2.75 Å to 3.15 Å.(Wiley-VCH Verlag, The crystal structure of hydrated barium copper oxalate) Kasthuri, V.B.; Rao, P.M.; Nethaji, M.1996Item Indium antimonide and gallium antimonide were synthesized from the respective component elements using an indigenously fabricated synthesis unit. Bulk crystals of indium antimonide and gallium antimonide were grown using both the vertical and horizontal Bridgman techniques. Effect of ampoule shapes and diameters on the crystallinity and homogeneity was studied. The grown crystals were characterized using X-ray analysis, EDAX, chemical etching, Hall effect and conductivity measurements. In the case of gallium antimonide, effect of dopants (Te and In) on transport and photoluminescence properties was investigated.(Growth and characterization of indium antimonide and gallium antimonide crystals) Udayashankar, N.K.; Bhat, H.L.2001Item Crystal structure of semiorganic antimony thiourea bromide monohydrate crystals: a redetermination(2009) Upadhya, M.K.; Udayashankar, N.K.The growth of antimony thiourea bromide monohydrate (ATBM) single crystals by evaporation technique at room temperature is reported here. Antimony thiourea bromide monohydrate crystallizes in the orthorhombic space group Cmca with unit cell parameters a = 12.320(7) A, b = 11.668(7) A, c = 18.615(11), and z = 8. The structure has been solved by direct methods and refined to a final R value of 0.0239.Item Synthesis, characterization and nonlinear optical properties of 2-[(E)-2-(4-ethoxyphenyl)ethenyl]-1-methylquinolinium 4-substitutedbenzenesulfonate compounds(2010) Ruanwas, P.; Kobkeatthawin, T.; Chantrapromma, S.; Fun, H.-K.; Philip, R.; Smijesh, N.; Padaki, M.; Isloor, A.M.In the present investigation, 2-[(E)-2-(4-ethoxyphenyl)ethenyl]-1-methylquinolinium 4-substituted benzenesulfonate (X = CH3 (1), X = OCH3 (2), X = Cl (3), X = Br (4)) have been synthesized and characterized by 1H NMR, UV-Vis and FT-IR spectroscopy methods. In addition compound 3 was also characterized by single crystal X-ray diffraction (XRD) and found that it crystallized out in the monoclinic space group P21 with cell parameters, a = 9.8072(9) Å, b = 6.4848(5) Å, c = 19.4405(16) Å, ? = 90°, ? = 103.421(5)°, ? = 90°, z = 2 and V = 1202.61(17) Å3. The nonlinear optical absorption of the samples has been studied at 532 nm using 5 ns laser pulses, employing the open-aperture z-scan technique. It is found that some of the samples are potential candidates for optical limiting applications. © 2009 Elsevier B.V. All rights reserved.Item Magnetic property and corrosion resistance of electrodeposited nanocrystalline iron-nickel alloys(Elsevier B.V., 2012) Pavithra, G.P.; Hegde, A.In the present investigation we have galvanostatically synthesized nanocrystalline Fe-Ni alloys on copper substrate. The effect of current density (c.d.) on composition, surface morphology and phase structure were studied for explaining the magnetic and electrochemical properties of the nanocrystalline alloy. The bath found to exhibit the preferential deposition of less noble Fe than Ni, and at no conditions of c.d., the deposition has changed from anomalous to normal type. Surface morphology and structural characteristics of the deposits were examined using scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. As composition of the alloy varied, consequent to the current density a change of body centered cubic structure (bcc) to face centered cubic structure (fcc) was observed for nanocrystalline materials. Finally, the conditions responsible for peak magnetic property and corrosion resistance were optimized. Factors responsible for improved functional properties were explained in terms of surface morphology and crystalline grain size of the coatings. © 2012 Elsevier B.V.Item Properties of ZnO:Bi thin films prepared by spray pyrolysis technique(Elsevier Ltd, 2013) Sadananda Kumar, N.; Bangera, K.V.; Anandan, C.; Shivakumar, G.K.Undoped and Bi doped zinc oxide thin films were deposited on glass substrate at 450 °C using spray pyrolysis technique. The X-ray diffraction studies shows that Bi doped ZnO films are polycrystalline hexagonal structure with a preferred orientation along (101) direction. Crystallites size of the films decreases with increasing doping concentration. Scanning electron microscope image shows change in the surface morphology. The composition of Zn, O and Bi elements in the undoped and Bi doped ZnO films were investigated by X-ray photoelectron spectroscopy. Bi doped ZnO thin films show a transparency nearly 75% in the visible region. The optical band gap of ZnO thin films reduces from 3.25 eV to 3.12 eV with an increase in Bi concentration from 0 to 5at.% respectively. Electrical conductivity of ZnO thin films increased from 0.156 to 6.02S/cm with increasing Bi dopant concentration from 0% to 5% respectively. © 2013 Elsevier B.V. All rights reserved.Item Nickel(II) complex of p-[N,N-bis(2-chloroethyl)amino]benzaldehyde-4-methyl thiosemicarbazone: Synthesis, structural characterization and biological application(Elsevier Ltd, 2013) Sankaraperumal, A.; Karthikeyan, J.; Nityananda Shetty, A.N.; Lakshmisundaram, R.New complex of Ni(II) with p-[N,N-bis(2-chloroethyl)amino]benzaldehyde-4- methyl thiosemicarbazone (CEAB-4-MTSC) have been synthesized and characterized by elemental analysis, IR, electronic, 1H NMR spectroscopy. The crystal structure of the free ligand and complex has been determined by single crystal X-ray diffraction technique. In the complex, thiosemicarbazone ligand is coordinated to nickel through (1:2 complex) SNNS mode. The complex crystallizes in the triclinic with space group P1?. The complex has been tested for their antibacterial activity against various pathogenic bacteria. From this study, it was found out that the activity of complex reaches the effectiveness of the conventional bacteriocide Streptomycin compared to simple ligand. © 2012 Elsevier Ltd. All rights reserved.Item Syntheses, crystal structures and antimicrobial studies of two new semicarbazone derivatives(2014) Chia, T.S.; Ching Kheng, C.K.; Ooi, C.W.; Garudachari, B.; Isloor, N.A.; Isloor, A.M.; Fun, H.-K.Two new derivatives of semicarbazone, (E)-2-(hexan-2-ylidene) hydrazinecarboxamide and (E)-2-(heptan-2-ylidene)hydrazinecarboxamide were synthesized and characterized by IR and 1H NMR. Their crystal structures were characterized by X-ray diffraction method. Compound (I) crystallizes in triclinic P 1 ?, a = 6.7679(7) Å, b = 7.1912(8) Å, c = 9.9969(11) Å, ? = 108.824(2), ? = 99.398(3), ? = 92.680(2), V = 451.75(8) Å3, Z = 2, R 1 = 0.043 and wR 2 = 0.140. Compound (II) crystallizes in triclinic P 1 ?, a = 6.7192(6) Å, b = 7.2094(6) Å, c = 11.2842(11) Å, ? = 103.303(2), ? = 106.198(2), ? = 91.219(1), V = 508.70(8) Å3, Z = 2, R 1 = 0.044 and wR 2 = 0.133. Their molecules adopt a L-shape conformation with C atom in C=N double bond acting as the junction point. The C=O double bond indicate the existence of semicarbazone group in keto-like form for both compounds in their solid state. In the crystal, the carbonyl O atom for both derivatives acts as a common acceptor in the intermolecular bifurcated N-H·O hydrogen bonding which linked the molecules into one-dimensional supramolecular ribbons. Antimicrobial studies by serial dilution method showed both compounds exhibit antibacterial property. Graphical Abstract: Two new semicarbazone derivatives are characterized by IR, 1H NMR and single crystal X-ray diffraction methods and their antibacterial activity was further investigated by screening against four different bacterial strains.[Figure not available: see fulltext.] © 2013 Springer Science+Business Media New York.