http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/935 2026-05-21T02:47:08Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/946 Title: Thermochemical studies of thorium(IV) and zirconium(IV) tetrabenzoates Authors: Pathak, Raghvendu Abstract: Thermochemical studies of metal compounds of ‘s’ and ‘f’ block elements and those of organometallic compounds are of immense importance because not only they furnish invaluable information regarding analysis and characterization of the compound thermodynamically but also give vital information regarding ‘specific enthalpy’ and ‘enthalpy density’. Thus viability and analysis of input and output of energy is of prime concern before any process or reaction or for that matter if any engine or industry is being set up because after all it is the process or reaction which takes place inside the engine. As the globe is gradually but certainly moving away from fossil fuel or carbon-based energy production as it immensely pollutes the environment due to evolution of greenhouse gases into the environment and contribute towards global warming, it is but necessary to evaluate the impact assessment of the pollutants on the environment before any engine or industry is being developed or installed. It is in this perspective that the thermochemical studies of metal compounds of ‘s’ ‘p’ ‘d’ and ‘f’ block elements and those of organometallic compounds become extremely important as it clearly identifies and defines the products as well as absorption and evolution of energy involved therein. 2016-01-15T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/943 Title: Calorimetric Computation of Enthalpy of Formation of Trisacetylacetonato Chromium(III) [Cr(C5H7O2)3(c)] Authors: Pathak, Raghvendu Abstract: From thermochemical studies of organometallic compounds, a host of thermodynamic parameters viz., heat capacity, entropy, Gibbs energy etc., can be evaluated. The present communication deals with the evaluation of enthalpy of combustion and thereby estimation of enthalpy of formation of crystalline trisacetylacetonato chromium(III) [Cr (C5H7O2)3 (c)] or [Cr (acac)3 cH) and enthalpy of formation fH° –1 –1 respectively. Experimental data obtained are in good agreement with one another. 2019-01-01T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/942 Title: The long-wavelength-limit of structure factor and chemical ordering in binary Ag-In melts Authors: Pathak, Raghvendu Abstract: The long-wavelength-limit partial structure factors, Sxy(0), have been determined for liquid silverindium (Ag-In) alloys using square well potential as perturbation over Percus-Yevick (PY) hard sphere reference system. Obtained Sxy(0) at various compositions of In have been employed to calculate isothermal compressibility and chemical ordering in the alloys. Further, homocoordination and hetero-coordination in Ag-In alloys have been studied at microscopic level in terms of mutual and intrinsic diffusion coefficients 2015-01-29T00:00:00Z http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/939 Title: Solvation enthalpy of uranium tetrachloride in aqueousalcohols mixed solvents Authors: Pathak, Raghvendu Abstract: The process of interaction between ions of a solute and the molecules of the solvent through relatively weak covalent bonds is called solvation. It involves evening out a concentration gradient and evenly distributing the solute molecules within the solvent. Hydration is a special case of solvation when the solvent molecules are water. Solvation energy, generally, is the energy released when ions in crystal lattices associate with molecules in a solvent, however it can be positive or negative, depending upon the combined effects of lattice and hydration energies in case of aqueous-ionic solid dissolution. Uranous chloride or uranium tetrachloride (UCl4) is a green crystalline solid which sublimes in vacuum at 500°C/10-3 mm. It is a Lewis acid and hence dissolves in solvents which can act as non-protic Lewis bases. Although dissolution of uranium tetrachloride crystals in water is an exothermic process yielding a green solution which is fairly stable in the cold, yet is hydrolyzed to a considerable extent to furnish an acidic reaction. Solvation enthalpies of quadrivalent uranium system have been scantly reported. The present communication deals with the calculation of enthalpy of solution of uranium tetrachloride in aqueous-non-aqueous solvent mixtures, particularly in 10 and 20 weight (wt) % methyl alcohol-water and ethyl alcohol-water systems at 25°C calorimetrically and thereby estimating the solvation enthalpy of UCl4 in the said media. 2017-08-07T00:00:00Z