Search Results - "Umarji, A.M"

Enhanced thermoelectric figure of merit in nano-structured Si dispersed higher manganese silicide by Perumal, S., Gorsse, S., Ail, U., Prakasam, M., Rajasekar, P., Umarji, A.M.

“…Higher manganese silicide (HMS) is considered as a promising thermoelectric material at intermediate temperatures. Samples of Si-rich HMS were prepared by arc…”
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The influence of Zr/Ti content on the morphotropic phase boundary in the PZT–PZN system by Geetika, Umarji, A.M.

“…A quantitative structural investigation was carried out on (1 − y)PbZr x Ti 1− x O 3– yPbZn 1/3Nb 2/3O 3 where y = 0.1 and 0.2 ((1 − y)PZT– yPZN). High…”
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Thermal degradation kinetics of poly(trimethylol propane triacrylate)/poly(hexane diol diacrylate) interpenetrating polymer network by Goswami, Ankur, Srivastava, Geetika, Umarji, A.M., Madras, Giridhar

“…► Interpenetrating polymer networks (IPNs) of TMPTA–HDDA were synthesized. ► Thermal and thermo-oxidative degradation of these IPNs were carried out. ► The…”
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Low thermal conductivity of endogenous manganese silicide/Si composites for thermoelectricity by Perumal, S., Gorsse, S., Ail, U., Prakasam, M., Vivès, S., Decourt, R., Umarji, A.M.

“…Higher manganese silicide (HMS) based alloys with eutectic composition (Si-33.3at% Mn) were prepared by arc-melting, melt-spinning and ball milling in order to…”
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Role of milling parameters and impurity on the thermoelectric properties of mechanically alloyed chromium silicide by Dasgupta, T., Umarji, A.M.

“…Mechanical alloying of Cr–Si powders (1:2 molar ratio) was carried out under different milling conditions using stainless steel milling media. In addition to…”
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Investigation of tetragonal distortion in the PbTiO3–BiFeO3 system by high-temperature x-ray diffraction by Sai Sunder, V.V.S.S., Halliyal, A., Umarji, A.M.

“…Compositions in the (Pb1−xBix (Ti1−xFex)O3 solid solution system for x ⋚ 0.7 show unusually large tetragonal distortion. High-temperature x-ray diffraction was…”
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Phase evolution and infrared transmittance in monophasic VO2 synthesized by a rapid non-equilibrium process by Rajeswaran, Bharathi, Umarji, A.M.

“…VO2 displays a semiconducting to metallic (SMT) transition accessible near room temperature. This makes it one of the most sought after materials for…”
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In situ synthesis of Al2O3-ZrO2-SiCw ceramic matrix composites by carbothermal reduction of natural silicates by MARIAPPAN, L, KANNAN, T. S, UMARJI, A. M

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Thermally switchable metamaterial absorber with a VO2 ground plane by Naorem, Rameshwari, Dayal, Govind, Anantha Ramakrishna, S., Rajeswaran, Bharathi, Umarji, A.M.

“…A tri-layer metamaterial absorber, composed of a metal structure/dielectric spacer/vanadium dioxide (VO2) ground plane, is shown to switch reversibly between…”
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Dilatometric approach for the determination of the solid state reaction-onset of the lead based relaxor ferroelectric system by Bhat, V.V., Radhika Rao, M.V., Umarji, A.M.

“…Dilatometer based thermal expansion studies have been carried out on the starting oxide mixtures of some of the important relaxor ferroelectric compositions…”
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Role of crystal structure on the thermal expansion of Ln 2W 3O 12 (Ln = La, Nd, Dy, Y, Er and Yb) by Sumithra, S., Umarji, A.M.

“…The negative thermal expansion material Y 2W 3O 12 belongs to Ln 2W 3O 12 family of compositions. The thermal expansion behavior of Ln 2W 3O 12 (Ln = La, Nd,…”
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Application of principal component analysis to gas sensing characteristics of Cr0.8Fe0.2NbO4 thick film array by Sree Rama Murthy, A., Pathak, Dhruv, Sharma, Gautam, Gnanasekar, K.I., Jayaraman, V., Umarji, A.M., Gnanasekaran, T.

“…The transient changes in resistances of Cr0.8Fe0.2NbO4 thick film sensors towards specified concentrations of H2, NH3, acetonitrile, acetone, alcohol,…”
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Negative thermal expansion in rare earth molybdates by Sumithra, S., Umarji, A.M.

“…Negative thermal expansion in rare earth molybdates of A 2 Mo 3O 12 family ( A = Y , Er, Yb and Lu) is measured by high temperature X-ray diffraction and…”
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Hygroscopicity and bulk thermal expansion in Y2W3O12 by Sumithra, S., Umarji, A.M.

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Thermal expansion studies in the lead iron niobiate — Lead titanate system by Sunder, V.V.S.S.Sai, Umarji, A.M.

“…Compositions in the solid solution series {Pb(Fe 0.5Nb 0.5)O 3} 1 − x — {PbTiO 3} x (x = 0 → 1) were prepared by solid state reaction. The phase transition…”
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Temperature dependent structural and dielectric investigations of PbZr0.5Ti0.5O3 solid solution at the morphotropic phase boundary by Srivastava, Geetika, Goswami, Ankur, Umarji, A.M.

“…PbZr1−xTixO3 ceramics synthesised by low temperature calcination followed by sintering at 1280°C show a Morphotropic Phase Boundary (MPB) for compositions of…”
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Improved ductility and oxidation resistance in Nb and Al co-substituted MoSi 2 by Dasgupta, T., Umarji, A.M.

“…Polycrystalline samples of (Mo 1− x Nb x )(Si 1− y Al y ) 2 with x = 0.0–0.03 and y = 0.0, 0.04 were prepared by arc melting followed by densification by hot…”
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Application of principal component analysis to gas sensing characteristics of Cr 0.8 Fe 0.2 NbO 4 thick film array by Sree Rama Murthy, A., Pathak, Dhruv, Sharma, Gautam, Gnanasekar, K.I., Jayaraman, V., Umarji, A.M., Gnanasekaran, T.

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Studies on physicochemical properties of pure and iron substituted chromium niobates, Cr1−xFexNbO4 (x=0, 0.2, 0.4, 0.6) by Sree Rama Murthy, A., Gnanasekar, K.I., Govindaraj, R., Jayaraman, V., Umarji, A.M.

“…[Display omitted] •Systematic increase in unit cell volume on iron substitution.•Similar mechanism of electronic conduction in these compositions.•Decrease in…”
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Improved ductility and oxidation resistance in Nb and Al co-substituted MoSi2 by Dasgupta, T., Umarji, A.M.

“…Polycrystalline samples of (Mo1-xNbx)(Si1-yAly)2 with x = 0.0-0.03 and y = 0.,0.04 were prepared by arc melting followed by densification by hot pressing. The…”
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