Materials Literature
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The oxygen diffusion coefficients of nondoped, Ho-doped and La-doped BaTiO3 polycrystals were evaluated by secondary ion mass spectrometry (SIMS). The La-doped and Ho-doped systems have a greatly reduced oxygen diffusion coefficient compared to nondoped BaTiO3. The oxygen diffusion coefficient of La-doped BaTiO3 was d…
The stability of the β phase at room temperature in various microstructures of a β-rich α + β type Ti–4.5Al–3V–2Mo–2Fe alloy and its relationship with the fracture toughness, hardness and tensile properties were investigated. A variety of microstructures were established by varying solution treatment temperaturesin β…
Abstract Biogenic silica with amazing diversity of nanostructure shells, fibers and granules in diatoms and sponges is radiated by proteins and polysaccharides and forms at ambient pressure and temperatures. Chemical synthetic methods, in contrast, have to rely on extreme pH and/or surfactants to induce the condensati…
Chromium, nickel and chromium–nickel alloy nanoparticles have been synthesised via the addition of a metal salt solution to a support, followed by drying and reduction with hydrogen at elevated temperatures. Chromium and chromium–nickel alloy particles were prepared using ethylene glycol solutions and were found to be…
The wettability at a liquid Al-alloy/SiC interface was evaluated by the sessile drop method at 750oC. The wetting angle, q ,of a sessile drop on SiC substrate decreased with the addition of Pb, Mg and Ca to pure aluminium. The reduction in q of the Al-Pb alloy was proportional to the reduction in surface tension, glv,…
The crystal structure of mineral bussenite, Na2Ba2Fe[TiSi2O7][CO3]O(OH)(H2O)F, found in the Khibiny massif (the Kola Peninsula) has been determined. The parameters of the triclinic unit-cell are a = 5.399(3) Å, b = 7.016(9) Å, c = 16.254(14) Å, α = 102.44(8)°, β = 93.18(6)°, γ = 90.10(7)°, sp. gr. $$P\bar 1$$ , R = 0.…
Water and alkali cation ( Na + and Cs + ) intercalation, configuration, and dynamics in various nickel hexacyanoferrate (NiHCF) structures were studied using molecular dynamics (MD) techniques and compared to experimental results. We examined three different solid structures common to the transition-metal hexacyanofer…
Electrochemical copolymerization of diphenylamine (DPA) with 2,5-diaminobenzenesulfonic acid (DABSA) was carried out in aqueous 4 M by employing cyclic voltammetry (CV). Copolymer films were grown for different molar concentration ratios of DPA and DABSA. Electrochemical homopolymerization of DPA alone was also carrie…
The synthesis and characterisation of 4-(3′,4′,5′-trialkoxybenzoyloxy)pyridines (1a–e), and of their corresponding palladium(II), (2a–e), and platinum(II), (3a–e), complexes are described. The pyridine-based ligands are not mesomorphic, but upon complexation to PdCl2 or PtCl2, new hexacatenar mesogens are formed which…
Biodegradable poly(D,L-lactic acid) (PLA) microspheres containing hexamethylmelamine (HMM) were developed for potential use in chemoembolization and intraperitoneal implantation. The emulsion-solvent-evaporation/extraction method was used to prepare 15 formulations with different drug/polymer ratios, solvent compositi…
Several metal chalcogenides (e.g., ZnS, CdSe/ZnS) are known to be highly efficient scintillators. Concerns related to the use of these commercially available inorganic compounds (particle size: μm) include their low solubilities in organic and polymeric matrices. Their preparation in inorganic matrices, such as sol‐ge…
A generally known energy transfer route in activated phosphors is the cross relaxation and the subsequent impurity quenching. However, this mechanism is not satisfactory to explain the overall feature of measured decay curves of the transition in the wide range of concentrations. We suggested a new energy transfer sch…
Abstract X-ray and neutron diffraction techniques have been applied to quantitative texture analysis of a glaucophanite from the Sesia-Lanzo Zone (Western Italian Alps), naturally deformed under eclogite facies conditions. The comparison has been carried out in order to reveal the limits and problems of texture analys…
The purpose of this study was to clarify the mechanism of transformation from alpha-form to beta-form via beta'-form of glyceryl monostearate (GM) and to determine the optimum conditions of heat-treatment for physically stabilizing GM in a pharmaceutical formulation. Thermal analysis repeated twice using a differentia…
ZnO thin films were prepared on indium-tin oxide (ITO) substrates by pulsed current electrolysis. The preferred orientation of the ZnO thin films prepared by pulsed current electrolysis changed in order to (0002), and (1010) by the change in overvoltage. Green-yellow emission centered around 580 nm was observed for th…
Abstract Thin films of barium titanate (BaTiO 3 ; BT) of various thicknesses (20, 60, 120, 160 and 200 nm) were deposited by a modified sol–gel route on M‐plane sapphire [Al 2 O 3 : (10 1 0)] substrates. Raman spectroscopy (RS) and x‐ray diffraction (XRD) were used to evaluate the stress and structural changes with re…
Normal spinel ZnCr 2 O 4 undergoes an antiferromagnetic transition at T N =12.5 - 0.5 K. Dielectric constant makes a jump at T N , indicating that an abrupt change in the lattice structure is accompanied with the magnetic transition. X-ray powder diffraction shows that a probable symmetry below T N is an orthorhombic(…
The motion of a filamentary particle and also the discharge from a particle have been extensively investigated for the development of a prevention and protection method against breakdown in gas-insulated switchgear. The particle showed several different patterns of motion, e.g., "standing," precession motion, oscillat…
Previous work has demonstrated how and where the mixing of incompatible brines occurs in waterflooded reservoirs, and what the impact would be on scale prevention strategies in terms of timing and placement of squeeze treatments. This paper extends this work, by modelling the resulting in-situ deposition process. The…
An innovative solid carbonate-oxide composite and related fuel cell technology is reported. The solid carbonate-ceria composite (SCC) electrolytes were found to be highly conductive, with the material conductivity varying from 0.001 to 0.2 S/cm between 400 and 600°C. Fuel cells using these electrolytes reached a power…