Materials Literature
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A model for the transport and reaction of BCI 3 and NH 3 for the deposition of BN on individual filaments in a fiber bundle at low pressures has been developed using previously published kinetic data. An operating diagram is presented which summarizes the results of the model and facilitates the choice of deposition p…
A previously developed formalism to interpret the beam broadening due to multiple small-angle scattering of a collimated beam of radiation in condensed matter is extended to treat the case of nonspherical scattering particles or pores. The new formalism concerns the situation where coherent single-particle scattering…
New liquid crystalline bicyclo[1.1.1]pentane derivatives have been prepared. Nematic and smectic A, B and C phases have been observed. When the bicyclo[1.1.1]pentyl unit is incorporated in a terminal alkyl chain, it acts as a chain stiffener without changing the transition temperature significantly. A bicyclo[1.1.1]pe…
BaCoS2 is orthorhombic Cmma a = 6.4413(3) Å, b = 6.4926(3) Å, c = 8.9406(3) Å, and is closely related to BaNiS2, which contains Ni-S layers separated by rock salt BaS sheets. Crystals were grown from the melt by slow cooling from 1050 to 950°C. The sulfur atoms in the Co-S layers have very anisotropic thermal displace…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Bonding of Bulk and Surface .theta.-Alumina from Periodic Hartree-Fock CalculationsA. P. Borosy, B. Silvi, M. Allavena, and P. NortierCite this: J. Phys. Chem. 1994, 98, 50, 13189–13194Publication Date (Print):December 1, 1994Publication History Published onlin…
Abstract We show at the example of noble gases, using the Lennard‐Jones potential to approximate the interactions between the atoms, that the global minimisation of the energy through variation of both the basis vectors of the simulation cell and the relative positions of the atoms within the cell leads to structures…
The arrangement of atoms in synchysite-(Ce) has been solved and refined to R = 0.036 using three-dimensional X-ray-diffraction data. In contrast to the putative hexagonal cell, weak X-ray-diffraction maxima on precession films demonstrate that synchysite-(Ce) is monoclinic, C2/c, a 12.329(2), b 7.110(1), c 18.741(2) A…
The surface defect structures on diamond (100) surfaces induced by 500 eV neon ion bombardment and by subsequent annealing were studied in situ with x-ray absorption near-edge structure (XANES) spectroscopy using 250–800 eV synchrotron radiation and with low energy electron diffraction. Ex situ x-ray photoemission spe…
Abstract Novel π-electron starburst molecules, 1,3,5-tris(phenyl-2-thienylamino)benzene (α-TPTAB) and 1,3,5-tris(phenyl-3-thienylamino)benzene (β-TPTAB), are found to form amorphous glasses with well-defined glass-transition temperatures of 38 and 46 °C, respectively, while 1,3,5-tris(diphenylamino)benzene instantly c…
Abstract The synthesis of 2-nitroalkanols from nitroalkanes and aldehydes occurs efficiently, in mild conditions without solvent, when mediated by layered Zr(KOPO3)2. The reaction has been tested in the preparation of ten different nitroalkanols and the data obtained seem to indicate that not only the surface but also…
Many of the micaceous soils of the Indo-Gangetic alluvial plain of northwestern India are sodic and have clay-enriched textural B horizons. These soils sometimes lack identifiable clay skins. In order to determine the genesis of the textural B horizons of these soils, both with and without identifiable clay skins, one…
Application of polyaniline semiconductor films to potentiometric biosensor development provides certain advantages comparing with the known systems. Using self-doped polyaniline instead of common polymer as pH transducer the stable potentiometric response of 70 mV/pH was obtained. Taking as an example glucose biosenso…
The Schottky barrier formation between Bi and polycrystalline, ceramic ZnO has been studied with photoelectron spectroscopy (PES) under ultrahigh-vacuum conditions. This system is a simple model of a varistor compound. Evaporation of Bi on highly n-doped (Al) sintered ZnO surfaces, fractured in situ and held at room t…
The crystal structures of two isomers of 2-(thienyl)glyoxime, 2-thienylethanedial dioxime, C 6 H 6 N 2 O 2 S, E,E [orthorhombic, Pbca, a=11.074 (5), b=9.152 (3), c=14.660 (4) A, V=1185.84 A 3 , D x =1.522 g cm -3 , Z=8, R=0.058 for 1276 reflections with I>3σ(I)] and E,Z [monoclinic, P2/c, a=12.189 (3), b=3.865 (3), c=…
Measurements of the dielectric permittivity are reported for a solid solution of antiferroelectric (betaine phosphate${)}_{0.15}$ and ferroelectric (betaine phosphite${)}_{0.85}$ at frequencies 20 Hz 1 MHz. The freezing phenomena in ${\mathrm{BP}}_{0.15}$${\mathrm{BPI}}_{0.85}$ reveal the characteristics of a transiti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetathetical Synthesis of Binary and Ternary Antiferromagnetic Gadolinium Pnictides (P, As, and Sb)Randolph E. Treece, Jeanine A. Conklin, and Richard B. KanerCite this: Inorg. Chem. 1994, 33, 25, 5701–5707Publication Date (Print):December 1, 1994Publication History Publishe…
Abstract Polymer “brushes” are formed when long‐chain molecules are somehow attached by one end at an interface with a relatively small area per chain. Such adsorbed brushes in the presence of solvent may be used to modify surface properties, stabilize colloidal particles, etc. Strongly segregated block copolymer phas…
Abstract There exist important industrial applications, such as hoses or plastic windows, dealing with closely combining plasticized and rigid poly(vinyl chloride). Nevertheless, migration of plasticizer causes severe variation of the mechanical performance of the end‐products. This work comprises an effort to investi…
The paper presents the new method of mathematical treatment which allows to extract essential information about domain kinetics in polycrystal films from the traditional measurements of switching current. This information can not be obtained within the commonly used treatment. The method was verified by computer simul…
Densification and grain growth of porous alumina compacts during various high‐temperature processes were investigated. Experimental data were obtained for densification and grain growth of alumina powder during hot pressing. A set of constitutive equations was proposed based on the constitutive equations by Helle et a…