Materials Literature
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It is well-known that for a polar dielectric liquid exhibiting a single relaxation time, graphs of the real and imaginary parts of the permittivity against the logarithm of frequency are of the hyperbolic tangent and hyperbolic secant type, respectively. This was first predicted by Debye, but it was pointed out later…
Abstract The electrocatalytic behavior of a group of metal substituted heteropolyanions towards the oxidation of adrenaline was investigated in solution studies using both UV/vis and electrochemical techniques. Of the metal (M′) substituted Dawson phosphotungstates ([P 2 W 17 O 61 M′] n − ) examined, iron, copper and…
Nanocrystalline films of SnO 2 were deposited by liquid flow deposition (LFD), i.e., by flowing aqueous solutions of SnCl 4 ·5H 2 O and HCl over single‐crystalline silicon substrates at 80°C. The substrates were either oxidized and fully hydrolyzed (bare silicon) or oxidized, hydrolyzed, and then coated with siloxy‐an…
A light water reactor fuel analysis code FEMAXI-6 is an advanced version which has been produced by integrating the former version FEMAXI-V with numerous functional improvements and extensions. In particular, the FEMAXI-6 code has attained a complete coupled solution of thermal analysis and mechanical analysis, enabli…
The addition of nitrogen to duplex stainless steel weld metal has been achieved and the resultant weld metals have been assessed for their microstructural features and corrosion behaviour. It was found that, although autogenous welding of duplex stainless steels is not recommended, the addition of nitrogen through the…
Tunneling measurements of dI / dV , d 2 I / dV 2 , and d 3 I / dV 3 were formed along the C 3 axis (normally to layers) for Bi 2 Te 3 and Sb 2 Te 3 layered semiconductors in the temperature range 4.2< T >29 5 K. Temperature dependences of the forbidden band energy E g were obtained. The forbidden band energy in Bi 2 T…
A review is presented of chemical vapour deposition (CVD) diamond coating of silicon nitride (Si 3 N 4 ) materials. Microcrystalline and nanocrystalline diamond films were grown using microwave plasma (MPCVD) and hot filament (HFCVD) reactors, respectively. Scanning electron and atomic force microscopy, μ-Raman spectr…
Al2O3 bicrystals containing [0001] symmetric tilt grain boundaries were fabricated to investigate atomic structures at their grain-boundary cores. Σ7 and Σ21 boundaries studied here have crystallographically equivalent grain-boundary planes of although they have different Σ values. Grain-boundary structures were studi…
Polyimides are commonly used as organic passivation layers for microelectronic devices due to their unique combination of low dielectric constant, high thermal stability, and excellent mechanical properties. Polyimides are well known to have poor adhesion to epoxy resins. Many surface treatment methods have been devel…
We present ab initio calculations of phonons in single-wall boron-nitride (BN) nanotubes. Raman and infrared (IR) active modes of isolated and infinitely long tubes are evaluated according to the nonsymmorphic rod groups of BN nanotubes. For tubes of finite length, the selection rules are less restrictive and give ris…
This investigation focuses on the study of the dissolution by annealing of carbides present in thin walled ductile iron parts. Ledeburitic carbides are usually present in the microstructure as a consequence of the rapid solidification rate induced by the small thickness. The dissolution treatment is carried out by ann…
Thermodynamic information is critical for the assessment of the reactivity and stability of materials. New procedures have recently been developed that provide straightforward predictive methods for estimating lattice energy and standard entropy of conventional salts. These procedures also open up new possibilities fo…
This paper presents a new technique for detection and localization of partial discharges (PD) in large rotating machines. In this technique, denoted "InTech", a stator winding with (n) coils is equipped with (n + 1) inductive sensors; as a result, every stator coil is situated between two sensors. The measurement is t…
Abstract Correlations between the valence states, crystal structure, and electronic states in biferrocenium charge-transfer complexes with tetracyanoquinodimethane (TCNQ) acceptors have been revealed. Structural determination of (1′,1″′-dipropyl-1,1″-biferrocenium)+(TCNQ)3− (1) and (1′,1″′-dibutyl-1,1″-biferrocenium)+…
The layered precursor of MCM-22 was prepared with different Si/Al ratios: 15, 25, 50, 100 and ¥. Upon heat treatment these precursors form MCM-22 zeolite. Both layered precursor and MCM-22 zeolite were characterized by several techniques: Chemical Analysis by Atomic Absorption Spectroscopy (AAS), X-Ray Diffraction (XR…
We present results from dielectric spectroscopy on four molecular glass-formers, both in bulk and in confined geometry. For systems exhibiting a well-resolved secondary (β) relaxation, the confinement induces a relative enhancement (compared to the main α relaxation) of the effective dielectric strength of the β proce…
This study was undertaken to investigate the influence of Nb and V alloying elements and manufacturing conditions on the microstructural behaviour and mechanical characteristics of HSS (high speed steel) roll manufactured by a VCC (vertical centrifugal casting) process. In the Fe - 2C - 6Cr-1.5W - 3Mo - 4V alloy, the…
We synthesized spinel ZnAl 2 O 4 film on α‐Al 2 O 3 substrate using a solid‐phase reaction between the pulsed‐laser‐deposited ZnO film and α‐Al 2 O 3 substrate. Auger electron spectroscopy showed that the atomic distribution in the spinel ZnAl 2 O 4 was inhomogeneous, which indicated that the reaction was diffusion co…
The metal-insulator transition (MIT) of the Magnéli phase V 4 O 7 is studied by means of electronic-structure calculations using the augmented spherical wave method. The calculations are based on the density-functional theory and the local density approximation. Changes of the electronic structure at the MIT are discu…
The structure and transport properties of LaTiO3+x epitaxial thin films grown on (001) SrTiO3 by pulsed-laser deposition is examined. Four-circle X-ray diffraction indicates that the films possess the defect perovskite LaTiO3 structure when deposited in vacuum, with the higher X compounds forming at moderate oxygen pr…