Mishra P.M.,Mlsm College
Oriental Journal of Chemistry | Year: 2013
The ligand 2 - hydroxy - 4 - nitro acetophenone hydrazone was synthesized by the condensation reaction. Complexes of Co(II), Ni (II) and Cu(II) was prepared by refluxing metal salts with the ligands. Properties of complexes have been studied by elemental analysis, study of solubility, decomposition temperature, magnetic susceptibility, electrical conductivity, electronic and IR spectra of ligands and complexes. On the basis of the experimental results probable structures of all the metal complexes have been proposed.
Sharma A.D.,Mlsm College |
Sharma A.K.,Snow and Avalanche Study Establishment |
Thakur N.,Himachal Pradesh University
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2016
Considerable progress has been made for the solidification of metal powders with improved properties by using varieties of metallurgical methods. However, solidification of superalloy powders offers many difficulties under traditional processes. This article outlines an extensive program being undertaken to produce monoliths of superalloys with enhanced microstructural and mechanical properties. EP741NP superalloy has been subjected to explosive shock wave loading to obtain uniform and crack-free monoliths. An axisymmetric cylindrical configuration with a plastic explosive of high-detonation velocity has been used to consolidate the superalloy powder nearer to its theoretical density (~98 pct). By careful design of experiments, detonation velocity has been measured vis-à-vis compaction of metal powders in a single-shot experiment by employing instrumented detonics. The shock-processed specimens characterized for phase, lattice parameter, and structural variation by X-ray diffraction technique show intact crystalline structure. Results obtained from Williamson-Hall method indicate small micro-strain (2.8 × 10−3) and decreased crystallite size. Energy-dispersive spectroscopy suggests no segregation within the specimens. Scanning electron microscopy shows fracture-less and micro-cracks/void-free compacts of superalloy indicating satisfactory sub-structural strength. Indentation experiments with variable loads (1.96 N and 2.94 N) performed on the shock-processed specimen cut along transverse section show high order of Vicker’s micro-hardness value up to 486 Hv. The tensile and compressive strengths of the superalloy monoliths cut along the consolidation axes have been found to be 824 and 834 MPa, respectively. © 2016 The Minerals, Metals & Materials Society and ASM International
Mishra A.K.,Mrm College |
Mishra P.M.,Mlsm College |
Misra S.K.,P.A. College
Rasayan Journal of Chemistry | Year: 2011
It has been observed that Schiffs bases derived from substituted furan or furyl glyoxal possess antifungal activity. The fungal toxicity increases with chelation of these compounds with metals. Metal ligand stability constant of above systems are to be determined by Calvin Bjerrum pH metric titration technique as adopted by Irving-Rossotti. © 2011 RASĀYAN. All rights reserved.
Shakti S.,Mlsm College |
Mishra S.K.,Mlsm College |
Mishra P.M.,Mlsm College |
Jha A.K.,Mlsm College
Asian Journal of Chemistry | Year: 2010
The preparation, properties, elemental analysis, magnetic susceptibility, electrical conductivity, electronic and IR spectral properties of the ligand 2-hydroxy-3-nitro acetophenyl thiosemicarbazone and its complexes with chromium(III), iron(III), copper(II) and manganese(II) have been discussed. On the basis of these observations, probable structures of all the metal complexes have been assigned.