Materials Literature
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Arrhenius models were developed for glass viscosity within the processing temperature range for six types of commercial glasses: low-expansion-borosilicate glasses, E glasses, fiberglass wool, TV panel glasses, container glasses, and float glasses. Both local models (for each of the six glass types) and a global model…
Red emitting phosphor excited by blue-near ultra violet light emitting diode is being expected for new application of lightings. In our previous work, it was obtained that anataze- and rutile-type TiO2:Eu, and metal-Ti-O:Eu showed red emission of Eu3+ f–f transition. Mg-Ti-O:Eu showed strong emission peaked at 615 nm…
A series of poly(p-arylene butadiynylene)s containing zero, one, and two co-facial pi-pi interactions per repeat unit were synthesized and characterized. A surprisingly selective and high-yielding Diels-Alder cycloaddition of anthracene and nonsymmetric, sterically hindered anhydrides proved essential to generating th…
We report the synthesis of ternary polymer particle material systems composed of (a) a spherical colloidal particle core, coated with (b) a polyelectrolyte intermediate shell, and followed by (c) a grafted polymer brush prepared by surface-initiated polymerization as the outer shell. The layer-by-layer (LbL) depositio…
SiC nano-powder was synthesized by mechanical alloying method, and then consolidated by Spark plasma sintering without any sintering additives. Crystallite size of sintered SiC was increased from 26 to 61 nm with holding temperature, but relative density was practically fixed. Increasing of thermal and electrical cond…
Abstract The results of the application of the spectroscopic phase modulated ellipsometry (SPME) to a series of novel ternary compounds from anisotropic to polycrystalline are presented to show the high effectiveness of this optical technique with regard to the dielectric function of the new materials. Besides, SPME i…
This study describes the observation of large induced refractive index changes produced by 157nm excimer laser exposure in high-purity synthetic silica glasses. With 157nm exposure, large induced changes are observed within a few hundred thousand pulses of exposure. Similar to 193 nm exposures, exposure with polarized…
Deriving the optimal bondline thickness for an athermal bondline depends on many factors. An optimum bondline is defined as one that produces zero radial stress at the optic/adhesive interface. A review of the current equations in use and a new non-linear equation defined for optic mounts over larger temperature range…
X-ray diffraction (XRD) profiles are conventionally used to determine lattice spacings via Bragg's law in order to characterize crystalline materials. It does not appear to be widely known that they also permit compositional information, such as effective atomic number and a density descriptor, to be determined from m…
Abstract The spinodal decomposition in (Zn, Cr)Te is simulated by using first principles calculations and Monte Carlo simulation. It is found that the chemical pair interaction between Cr atoms in (Zn, Cr)Te is attractive interaction and leads to spinodal decomposition. Curie temperatures in decomposed situation are e…
Abstract The band structure of ternary chain TlInTe 2 was calculated with allowance for non‐locality of ionic pseudo‐potentials. The dielectric function, as well as the effective masses of holes and electrons, the effective number of valence electrons, and the function of characteristic losses were determined. The res…
Silicone based materials have attracted considerable attention from light emitting diode (LED) manufacturers for use as encapsulants and lenses for many high brightness LED (HB LED) devices. Currently silicones function in two key roles in HB LED devices, (1) as protective lenses and (2) stress relieving encapsulants…
Rare-earth oxyapatites MLn4Si3O13 (M = Ca, Sr, Ba Ln = La, Gd) have been proposed as a new plasma display panel (PDP) host material to overcome the problems of Zn2SiO4:Mn commercial green phosphor, such as luminance degradation and poor surface charge. Tb-doped MLn4Si3O13 phosphor powders show a green luminescence wit…
The published data on supramolecular complexes of porphyrins with optically active organic molecules are systematised. The key principles, mechanisms and driving forces of complexation and factors responsible for effective control over formation of supramolecular systems are considered.
The stable solid form of carbon is graphite; diamond is thermodynamically unstable at atmospheric pressure. High pressure and high temperature must be applied to enable diamond crystal growth. Cubic diamond grows when hydrostatic pressure is applied, whereas hexagonal diamond (which is another form of ${\mathrm{sp}}^{…
The nanocrystalline SrY2O4:Eu3+ was prepared by a poly(vinyl alcohol) (PVA)+glycine-assist combustion method. The results of x-ray diffraction indicate that the resulting SrY2O4:Eu3+ nanocrystals have much broader and less intense peaks compared with those in bulk material. The charge-transfer bands in SrY2O4:Eu3+ nan…
CuCrS2 has a nearly two-dimensional crystal structure, and is an insulator with antiferromagnetic ordering at T N = 40 K. We have prepared the substituted system described as CuCr1-x Vx S2. Powder x-ray diffraction patterns reveal that this system has a large solubility range of 0 ≤ x ≤ 0.9, within which single-phased…
The dispersion characteristics of asymmetric double-negative material slab waveguides have been investigated by using normalized parameters. The results show that the dispersion characteristics of these material waveguides differ dramatically from conventional guided waves, and they possess a number of unusual propert…
Abstract The surfaces of various mechanical pulp fibres, including thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), and alkaline peroxide mechanical pulp (APMP) fibres, were characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), and X‐ray photoelectron spectroscopy (XPS).…
Abstract This issue's Editor's Choice [1] reviews electronic and optical properties of various widegap oxychalcogenides which are connected to their crystal structures. Two examples are shown in the cover picture: Ln CuO Ch ( Ln = lanthanide, Ch = chalcogen, left) and La 2 CdO 2 Se 2 (right). These oxychalcogenides ha…