Materials Literature
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A new series of dyes for nonlinear optical (NLO) and photorefractive (PR) applications investigated by optical and electrooptical absorption spectroscopy. Optimized PR and NLO chromophores are obtained based on the exceptionally strong heterocyclic thiazolidenemalononitrile acceptor unit, combined with the proper choi…
It is demonstrated that a porous polysilicon (PPS) diode with a structure of Au/PPS/n-type Si operates as an efficient stable surface-emitting cold cathode. 1.5 μm of an nondoped polysilicon layer is formed on an n-type (100) silicon wafer and anodized in a solution of HF (50%): ethanol=1:1 at a current density of 10…
AFM images of isothermally crystallized samples of syndiotactic polypropylene and poly(propene-co-octene) show that the lamellar crystallites are composed of blocks. Upon heating the granular structure vanishes. Observations support the view recently established by SAXS experiments that polymer crystallization is a tw…
This paper presents experimental data on the bonding of CO and NO to vacuum-cleaved MgO(100) and NiO(100) and compares them with theoretical results. In the case of CO and NO on NiO(100) we find that the bonding energies obtained for the vacuum-cleaved single crystals agree well with results of recent studies on thin…
Tin-doped indium oxide (ITO) films were deposited on soda-lime glass plates without substrate heating by dc magnetron sputtering. Crystallinity and electrical properties of the films were investigated by X-ray diffraction and Hall-effect measurements, which showed clear dependence on target–substrate distance ( T – S…
The title compound, Ni 3 (dpa) 4 Cl 2 (dpa = di(2-pyridyl)amido anion), first reported 30 years ago, structurally characterized in 1991, has been obtained in two new crystal forms, Ni 3 (dpa) 4 Cl 2 ·2CH 2 Cl 2 (tetragonal, space group I 4̄, with a = 27.3046(7) Å, c = 12.2452(2) Å, Z = 8) and Ni 3 (dpa) 4 Cl 2 ·THF (o…
We formulate and apply an efficient finite-difference time-domain algorithm to the analysis of axially symmetric diffractive optical elements. We discuss aspects relating to minimizing numerical dispersion in the incident field, application of absorbing boundary conditions in the radial direction, convergence to a ste…
Thin films of barium-strontium titanate (Ba,Sr)TiO3(BSTO) have been investigated for use as a capacitor dielectric for future generations of dynamic random-access memory (DRAM). This paper describes progress made in the preparation of BSTO films by liquid-source metal-organic chemical vapor deposition (LS-MOCVD) and t…
Abstract Cu 2 (SeO 3 ) 2 · H 2 O and Tl(III) 2 Cu 3 (SeO 3 ) 6 were obtained in the course of low-hydrothermal experiments on natrochalcite-type selenate representatives. The crystal structures were determined by direct methods from single-crystal X-ray diffraction data collected with a CCD area detector. Cu 2 (SeO 3…
The water-soluble organophosphorus compound, namely, hexahydroxymethylamidocyclotriphosphatriazatriene (HHMAPT) was synthesized by reacting phosphonitrile chloride with liquid ammonia followed by reaction with formaldehyde. It is rich in phosphorus and nitrogen and as a polyfunctional compound it can undergo several r…
The spinodal decomposition (SD) kinetics of the mixture of polystyrene (PS) and a low molar mass liquid crystal (LC) (E7) has been studied by means of time-resolved small angle light scattering (SALS) and polarized optical microscopy (POM). It is found that, in the isotropic spinodal region, the mixture first undergoe…
An experimental study has been conducted to investigate the effects of grain transport on the columnar to equiaxed transition (CET) in dendritic alloy solidification. Using the aqueous ammonium chloride solution as a transparent model alloy, experiments were performed in a vertical test cell with cooling from the top,…
Interest in mordenite as an inhalation hazard arose when it was discovered that the mineral exists in the subsurface of Yucca Mountain, NV, the site of a federally proposed nuclear waste repository. During preliminary geologic investigations at Yucca Mountain, workers performing air coring (dry-drilling) operations we…
In the fabrication of broad band optical waveguide modulators, a certain technology must be used to prepare 15–20-μm-thick Au electrodes on the SiO2 surface covering the waveguides. A thin transition metal film is commonly inserted between the Au and SiO2 to improve adhesive strength. The transition metal film used in…
An experimental study has been performed to gain some insight into the correlations between the deposition conditions and the structure of boron nitride (BN) coatings that are used in ceramic‐matrix composites. BN has been deposited at 700°C from BCl 3 ‐NH 3 ‐H 2 mixtures on various substrates, by using chemical vapor…
Previous extensive measurements of the growth rates of the (110) face of tetragonal lysozyme crystals have shown unexpected dependencies on the supersaturation. In this study, similar growth-rate measurements were performed for the (101) faces of the crystals. The data show a similar dependence on the supersaturation,…
This paper reports the recent progress in the ideal fabrics project that started in 1996. The aim of this project is to initiate the engineered manufacturing of “ideal fabric”. Ideal fabric is the fabric which satisfies the three conditions, good hand, good appearance of suit, and mechanical comfort for wear. The obje…
The constant concentration (CC), constant flux (CF), flux continuity (FC), and hybrid of flux continuity and constant concentration (FCCC) boundary conditions for electrochemical hydrogen permeation through iron or steel samples are reviewed and used to evaluate the hydrogen diffusivity from the permeation tests on fu…
Two new techniques in X-ray absorption spectroscopy (XAS) have recently been developed which provide previously unobtainable information on supported noble metal catalysts. Atomic X-ray absorption fine structure (AXAFS) provides direct information on the average changes in interatomic potential of the metal particles…
The EL technique is at least two orders of magnitude more sensitive than PD detection and can detect the initiation of polymeric ageing. It can also detect the conversion of a water tree to an electrical tree.