Materials Literature
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The behaviour of liquid crystal materials used in display devices is discussed. The underlying continuum theory developed by Frank, Ericksen and Leslie for describing this behaviour is reviewed. Particular attention is paid to the approximations and extensions relevant to existing device technology areas where mathema…
Clusters with polycyclic twelve-membered rings were formed exclusively from the reaction of [Hg(TePh)2] with HgX2 in pyridine. Clusters with just six members were formed from the same reaction in DMSO. In both cases, the solvent was coordinated to the clusters. The clusters, [Hg6(μ-Br)2Br2(μ-TePh)8(py)2] and [Hg3X3(μ-…
This paper describes the crystallographic features of a platelet-shaped precipitate that forms in the early stage of age hardening of Mg alloys containing rare-earth elements in the Ce subgroup. Transmission electron microscopy combined with computer simulation revealed that the precipitate, the habit plane of which i…
Sub-quarterwave multilayer coatings with more than two different materials are shown to provide a reflectance enhancement compared with the standard two-material multilayer coatings when reflectance is limited by material absorption. A remarkable reflectance enhancement is obtained when the materials in the multilayer…
The confined electrocrystallization technique, first described by Thakur et al., involves forcing electrocrystallization to occur within the interface of two opposite substrates. This technique is further demonstrated and extended herein to the synthesis of a variety of thin crystalline films of conducting and insulat…
Abstract Verbeekite, ideally PdSe 2 , monoclinic with space-group choices C 2/ m , C 2 or C m ; a = 6.659(7), b = 4.124(5), c = 4.438(6) Å, ß = 92.76(3)°, V = 121.7(4) Å 3 ; a : b : c = 1.6147:1:1.0761, Z = 2, is a new, very rare, primary mineral, intimately associated with secondary oosterboschite {(Pd,Cu) 7 Se 5 },…
The characterization and application of a multi-element Ge solid state detector in time-domain laser pump, x-ray probe (LPXP) x-ray absorption fine structure (XAFS) using a third-generation synchrotron source (Advanced Photon Source or APS) are described. In particular, the following problems are discussed: (1) proper…
Up-conversion luminescence properties and energy transfer processes in Nd3+, Yb3+, and Tm3+ co-doped ZrF4-based fluoride glasses have been studied under 800 nm light excitation. Blue up-converted emission around 478 nm which can be assigned to the Tm3+: 1G4→3H6 transition, was strongly observed. Up-conversion luminesc…
The space group theoretical analyses and assignment of the lattice modes of the KDP crystal have been made, and the Raman spectra of their growth solution have been observed in different growth regions. The attention is focused on the analysis of the 912 cm-1 band arising from the H2PO4- anions in the interface betwee…
This paper presents a numerical simulation of the first negative corona in SF 6 at atmospheric pressure, in a point-to-plane electrode system. A few experiments are first carried out in order to acquire a basic knowledge of the physical processes involved in the first negative corona. Since it does not seem convincing…
Supramolecular structures of polyaniline (PANI) and vanadium oxide (V2O5) have been assembled via the electrostatic layer-by-layer (ELBL) technique. Strong ionic interactions and H-bonding impart unique features to the ELBL films, which are distinct from cast films obtained with the same materials. The interactions we…
The intrinsic hysteresis of a ferroelectric bilayer with an antiferroelectric interfacial coupling is studied within the framework of the Transverse Ising Model. We find it is possible to exit triple hysteresis loops once the parameters of the two slabs are selected appropriately. The effects of the thickness, the int…
<abstract language="eng">The Ti-6Al-4V alloy used as biomaterial has been used over the last years. The literature shows controversies concerning the kind and the chemical composition of the film naturally and elctrochemically formed on the surface of the titanium alloy. The presente work studies the film compos…
Two recent experiments have shown dramatic changes in molecular dynamics when the size of the glass formers is reduced to the nanometre scale but in opposite directions. The first is a dielectric relaxation study by Anastasiadis et al. of the local segmental α relaxation in 1.5-2.0 nm poly(methyl phenyl siloxane) (PMP…
High‐temperature oxidation behavior, microstructural evolution, and oxidation kinetics of additive‐free α‐, β‐, and mixed silicon nitride ceramics is investigated. The oxidation rate of the ceramics depends on the allotropic ratio; best oxidation resistance is achieved for ceramics rich in α‐phase. Variations in the o…
We report an experimental system dedicated for high-resolution and low-temperature photoemission spectroscopy installed on the helical-undulator beamline of a compact 700 MeV electron-storage ring (HiSOR) at Hiroshima University. A 3 m off-plane Eagle normal-incidence monochromator at the beamline covers the photon-en…
Abstract The volume proportions of the mineral phases in two strongly deformed olivine-orthopyroxene rocks have been quantified by whole-pattern stripping of fixed geometry X-ray powder diffraction data. The results were compared with the phase proportions as determined by Rietveld refinement of time-of-flight neutron…
Ge nanocrystals were produced in 4H–SiC by implantation of 250 keV Ge+ ions with a dose of 1×1016 cm−2 and subsequent rapid thermal annealing at 1400–1600 °C. Radiation damage and Ge distribution after implantation and annealing were analyzed by Rutherford backscattering spectrometry, cross-sectional transmission elec…
The extinction coefficient, k ( E ), and refractive index, n ( E ), of zinc meso -tetra porphyrin (ZnP) when incorporated into nanoporous titania were measured in the range 1.7−4.2 eV, by using a method that accounts for both the microstructure and morphology of the semiconductor matrix. Optical and fluorescence spect…
Samples of BaZr 0.95 M 0.05 O 3-α (where M = Al, Er, Ho, Tm, Yb and Y) were prepared by solid state reaction method. The bulk conductivity of the specimens under wet N 2 exposure was studied as a function of temperature, dopant ionic radius and the electronegativity of dopants. The correlation between the conductivity…