Materials Literature
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Nanocrystalline and nanocomposites of (Mn0.6Zn0.4Fe2O4)(1−z)(SiO2)z (z=0.0,0.10,0.15,0.25) were prepared by sol-gel method. The as-prepared samples were annealed at 200, 400, and 600 °C. The crystallographic phases, particle sizes and their distributions, etc. of the annealed samples were determined by x-ray diffracti…
Magnetic properties in Zn-doped SnO2 are examined through the first-principles electronic structure calculations based on density functional theory. Our results reveal that Zn-doping induces localized spin magnetic moments primarily on the first coordination shell of O atoms surrounding the Zn atom as well on Zn atom…
Abstract Understanding the mechanisms of translational and localised ionic movements in disordered materials has seen intense activity spanning several decades. This article attempts to convey a concise overview of our contribution to this field over the period from 2005 to 2010 and to place it in its broad context.
BiFeO 3 , BiFe0.9Ti0.1O3, and BiFe0.9Ti0.05O3 ceramics of relatively high perovskite phase content were prepared for a comparison study. While both BiFe0.9Ti0.1O3 and BiFe0.9Ti0.05O3 exhibit similarly improved weak ferromagnetism over BiFeO3, there exists a major difference in the x-ray diffraction patterns of BiFe0.9…
The fabrication of diamond-based vertical power devices which are the most suited for high current applications requires the use of thick heavily boron-doped (B-doped) diamond single crystals. Although the growth of thin B-doped diamond films is well controlled over a large concentration range, little is known about t…
Abstract: Films of 0.11 to 0.13 mm thickness were prepared using gelatins from the skins of cultured freshwater carp species and mammalian gelatins viz., porcine and bovine skin gelatin. A comparative study was made on the physical, mechanical, and barrier properties of these films. The amino acid composition, gel str…
Sr 2 TiMnO 6 , a double perovskite associated with high degree of B-site cation disorder was investigated in detail for its structural, magnetic, and dielectric properties. Though x-ray powder diffraction analysis confirms its cubic structure, first order Raman scattering and infrared reflectivity spectra indicate a b…
An efficient synthesis of hyperbranched poly( m -phenylene)s is achieved by Suzuki polycondensation of a m -terphenyl-derived branched AB 2 monomer. The resulting hyperbranched polymers show high molecular weight and relatively low polydispersity and are readily soluble in common organic solvents. A catalyst system co…
This paper presents a case study on the failures of three 230 kV XLPE cables. These cables failed after only 4 years of service. It was found that the copper woven fibre glass (CWFG) tape and the water swellable tape had many burnt stains. The causes of these stains were analysed. It was proved from theoretical analys…
The corundum-type In(2-2x)Zn(x)Sn(x)O(3) solid solution (cor-ZITO, x ≤ 0.7) was synthesized at 1000 °C under a high pressure of 70 kbar. cor-ZITO is a high-pressure polymorph of the transparent conducting oxide bixbyite-In(2-2x)Zn(x)Sn(x)O(3) (x ≤ 0.4). Analysis of the extended X-ray absorption fine structure suggests…
The cobalt borate HP-CoB 2 O4 was synthesized from Co 3 O 4 and B 2 O 3 under high-pressure / high-temperature conditions of 6.5 GPa and 950 °C. The structure of HP-CoB 2 O 4 is isotypic to HPNiB 2 O 4 and β -FeB 2 O 4 , representing the third example of a borate, in which every BO 4 tetrahedron shares a common edge w…
Using high-resolution electron-beam lithography and lift-off, Au structures with sub-10 nm dimensions or spacings were fabricated on 30-nm-thick silicon-nitride (SiN) membranes. Fabricating metal nanostructures on electron-transparent SiN membranes permitted their surface plasmon resonances to be measured using electr…
A FePt-based hard-magnetic nanocomposite of exchange spring type was prepared by isothermal annealing of melt-spun Fe52Pt28Nb2B18 (atomic percent) ribbons. The relationship between microstructure and magnetic properties was investigated by qualitative and quantitative structural analysis based on the x-ray diffraction…
Abstract Iron sulfide is a common scale-formation in sour-gas wells that restricts tubular diameter, reducing well productivity. Compared to other scales, iron sulfide has unique risks associated with chemical removal. For example, due to the corrosiveness of hydrochloric acid (the most common chemical agent for both…
This work reports an X-ray absorption near-edge structure spectroscopy (XANES) study at the Zn K-edge in ZnO nanoparticles (NPs) capped with different organic molecules. The analysis of the XANES spectrum of NPs capped with dodecanethiol suggests that several Zn atoms bond to the S atoms of the capping molecule. Indee…
Dense SnP2O7–SnO2 composite ceramics were prepared by reacting a porous SnO2 substrate with an 85% H3PO4 solution at elevated temperatures. At 300 °C and higher, SnO2 reacted with H3PO4 to form an SnP2O7 layer on exterior and interior surfaces in the substrate, the growth rate of which increased with increasing reacti…
This paper presents a comparative study of electrical charging and discharging behavior of different glasses submitted to electron beam irradiation in scanning electron microscope. Charge storage and charge spreading in these glasses have been examined with help of a time resolved current method. Our interest concerns…
In this Rapid Communication, we reported the results of NMR study on LiFeAs single crystals. We find a strong evidence of the low-temperature spin fluctuations; by changing sample preparation conditions, the system can be tuned toward a spin-density-wave (SDW) quantum-critical point. The detection of an interstitial L…
The effect of dissolved silica on the PVT properties of H 2 O and structure of silica-saturated aqueous fluids in equilibrium with quartz in the SiO 2 -H 2 O system has been determined in situ with the materials at temperature (up to 800 °C) and pressure (up to 1350 MPa) in a constant-volume hydrothermal diamond anvil…
Significant insight into reaction mechanism can be derived from the analysis of surface topography and kinetics of alteration of interfaces as a function of their environment. These data have largely been the purview of scanning and atomic force instruments, traditional optical microscopy, and electron beam technologi…