Materials Literature
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Voltage offset and built-in polarization were investigated in in-situ reactively sputter deposited PZT thin films on Pt, as a function of composition, doping and cooling conditions. The voltage offset increases with increasing Ti content. Hot-poling treatments show that the voltage offset originates from non-mobile de…
We have prepared novel tetraazacyclotetradecane derivatives, functionalised at nitrogen with a pendant thiophene or oligothiophene group, for electropolymerisation. Square planar Ni(II) complexes of these ligands, [Ni(L)](ClO4)2, have been prepared, and their electropolymerisation has been examined. The terthiophene-b…
We have studied the wide-range dielectric spectra of BaTiO3_δ single crystals and traced the evolution of the electronic structure of BaTiO3 with a very low oxygen vacancy concentration δ An extremely small δ can destroy the band edge and the Urbachian temperature dependence, and a so-called mid-infrared (ir) absorpti…
This title discusses direct hit technology in conjunction with a class of warheads coined near miss or direct hit warhead technology. These warheads utilize most of their entire volume and mass as damage mechanisms generating 10 to 30 times more mass deployed in the target's direction when compared to today's warheads…
Department of Electronics and computer science, Dr.B.A.M. University, Aurangabad-431004(M.S.), India(Received February 20, 2001) . aniline-dimethylsulphoxide(DMSO) aniline-dimethylformamide(DMF) dielectric rel-axation 10 MHz-10 GHZ TimeDomain Reflectometry(TDR) ! !# . dielectric parameter ( %&'…
Bulk mechanical alloying was successfully applied to solid-state synthesis of Mg2Ni, which is a promising hydrogen storage alloy. Through XRD, TEM and PCT measurement, the synthesized product was characterized to be a single-phase Mg2Ni, excluding co-synthesized MgNi2 or residuals of nickel or magnesium as in conventi…
This article provides an overview of biopolymers, classed according to their chemical structures, function and occurrence, the principles of biosynthesis and metabolism in organisms. It will then focus on polyhydroxyalkanoates (PHA) for which technical applications in several areas are currently considered. PHAs repre…
Chlorohydrin water-swellable rubber—composed of chlorohydrin rubber (CHR), crosslinked polyacrylate (CPA), the amphiphilic compatibilizer poly(vinyl alcohol)-g-poly(butyl acrylate) (PVA-g-PBA), precipitated silica (PSA), and poly(ethylene glycol) (PEG)—was prepared. The dispersion of PEG in the blend was characterized…
Increasingly, industrial materials are being designed to have structure on length scales of tens to thousands of nanometers. These structures are crucial to achieving a particular desired material property. Such structures, however, may depend on the underlying chemistry of the material for their existence. For exampl…
Pressmud is an unavoidable waste generated from sugar industries. Pressmud is rich in many plant nutrients and it also has properties to ameliorate degraded soils. For this reason pressmud is believed to be of much use in agriculture. Many research works indicate that application of pressmud improves soil fertility, n…
In superlattice (SL) structures an enhancement of the thermoelectric figure of merit ZT compared to homogeneous materials can be achieved by reduction of the thermal conductivity /spl lambda/. In this context thermoelectric properties of PbTe/ PbSe/sub x/Te/sub 1-x/-SL's, and PbTe(BaF/sub 2/) doping superlattices (SL)…
Al 2 Cu thin films (∼382 nm) are fabricated by melting and resolidifying Al/Cu bilayers on a SiO 2 on Si(100) substrate in the presence of a ∼3 nm Al 2 O 3 passivating layer. X-ray photoelectron spectroscopy (XPS) measures a 1.0 eV shift of the Cu 2 p 3 / 2 peak and a 1.6 eV shift of the valance band relative to metal…
The effects of a series of small structural changes to (S)-5-nitro-N-(1-phenylethyl)pyridin-2-amine on its solid state non-linear optical properties, including the phenomenon of rotating dielectric axes, have been investigated. Installation of a methyl group in the 3-position of the heterocyclic ring or at the amino n…
The effect of thermal/electrical poling on the surface structure of 30ZnO·70TeO 2 glass has been investigated by means of IR reflectance and X‐ray photoelectron spectroscopy (XPS). All the poled glasses exhibit a common characteristic that the second‐order nonlinearity is induced preferentially in an anode‐side surfac…
Abstract The ordered, low-temperature phase of the globular organic molecule norbornene, (bicyclo[2.2.1]hept-2-ene, C 7 H 10 ), has been determined by high resolution powder X-ray diffraction using synchrotron radiation, by auto-indexing, then by intensity extraction and direct methods using the EXPO package. The stru…
The structure of a crystalline approximant (called “PD3c phase”) in an Al71.5Co16Ni12.5 alloy annealed at 900°C for 120 h has been studied by high-angle annular detector scanning transmission electron microscopy (HAADF-STEM) and high-resolution transmission electron microscopy (HREM). The PD3c phase has an orthorhombi…
Polyurea microcapsules containing 2- chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl) acetamide as the active agent were prepared by the method of interfacial polycondensation with methylene bis(phenyl isocyanate) the multifunctional isocyanatae, hexamethylene diamine as the diamine, and anionic (SLS) as the emulsifying…
Temperature programmed thermal desorption spectrometry (TPD) is used to study kinetics of molecular hydrogen release after sorption of hydrogen atoms. A sharp decrease of hydrogen release rate is observed if linear heating of the sample is interrupted at any intermediate temperature. A similar behaviour of release cur…
By using a vertical sectioning method (VSM) or secondary electron line scanning method (SELSM), the fractal dimension DS for surface, DL for scanning profile were measured quantitatively on some typical fracture surfaces, namely cleavage fractures, dimple fractures and fatigue fractures of composite materials. It was…
The crystallization mechanism of Al-TS-1 zeolite has been investigated using amorphous wetness-impregnated Al2O3–TiO2–SiO2 xerogels as raw materials. Samples with different degrees of crystallinity have been prepared and characterised by means of conventional techniques. The catalytic activity of the Ti and Al centres…