Materials Literature
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The electronic properties of diamond with particular emphasis on current research into the production of semiconducting films by chemical vapour deposition are reviewed. It is stressed that no method of producing n-type diamond having a conductivity appropriate to device applications has been developed to date. An ana…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonoluminescence from nonaqueous liquids: emission from small moleculesEdward B. Flint and Kenneth S. SuslickCite this: J. Am. Chem. Soc. 1989, 111, 18, 6987–6992Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August 1…
Lead magnesium sniobate, Pb(Mg 1/3 Nb 2/3 )O 3 (PMN), was prepared by a sol‐gel technique using alkoxide precursors. The hydrolysis‐condensation mechanism leads to a translucent gel which is dried under hypercritical conditions to avoid collapse of the porous texture. After drying, the aerogel exhibits a B‐deficient p…
Abstract Treating the gold—cesium as an ionic melt around 50 at% of Cs, Blum's generalized equations of asymmetric electrolytes are used to compute the partial structure factors and the total structure factors. The partial and total pair correlation function and coordination numbers are calculated from the computed st…
Abstract Raman spectra of Mg(ClO 4 ) 2 NaNCSH 2 O mixtures were analysed as a function of the concentration ratio of the components at ambient and elevated temperatures. The strong perturbation of the thiocyanate spectrum observed in the regions of the ν 1 and ν 3 vibrations is interpreted in terms of complex format…
Abstract Polycondensation of diols with phosphonic bis(dialkylamide)s leads to high‐molecular‐weight polyphosphites ( M̄ n up to 4 · 10 4 ). Model reactions of 1‐butanol, 2‐butanol and phenol with phosphonic bis(diethylamide) ( 1 ) were studied and it was established, that these reactions exhibit characteristic induct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe application of equation-of-state theories to narrow molecular-weight distribution mixtures of polystyrene and poly(vinyl methyl ether)D. J. Walsh, G. T. Dee, J. L. Halary, J. M. Ubiche, M. Millequant, J. Lesec, and L. MonnerieCite this: Macromolecules 1989, 22, 8, 3395–3…
Pressureless sintering of hexagonal boron nitride (BN) was performed using a powder activated by mechano‐chemical treatments. Physical properties of the sintered BN bodies depend on the type of starting powder and the conditions of the treatments. The BN body, which was obtained at 2000°C using an appropriate activate…
In this paper, a nonlinear optimization technique is applied to determine optimal combinations of fabric low-stress mechanical and surface properties for men's suiting materials. The optimization procedure maximizes an "objective function" for handle expressed in terms of the instrumental measurements of fabric proper…
Etude des structures cristallines a 210 K (structure incommensurable) et 115 K (surstructure commensurable) par diffraction RX avec affinement respectivement jusqu'a 0,045 et 0,041 (pour 1073 et 1215 reflexions principales). La modulation s'interprete par une rotation des tetraedres ZnCl 4 autour de deux directions cr…
Abstract The capabilities of X-ray powder diffraction (XRD), infrared absorption (IR), solid-state magicangle-spinning nuclear magnetic resonance (MAS-NMR), and chemical dissolution methods were assessed for estimating the amount of noncrystalline material in a ground kaolinite. The Georgia kaolinite was ground in a m…
Abstract Poly[3,3‐bis(hydroxymethyl)oxetane], PBHMO, was prepared in high molecular weight (η inh up to 5.2) by polymerizing the trimethylsilylether of 3,3‐bis(hydroxymethyl)oxetane with the i ‐Bu 3 Al–0.7 H 2 O cationic catalyst at low temperature, followed by hydrolysis. PBHMO is crystalline, very high melting (314°…
We have prepared dense polycrystalline gadolinium gallium garnet (GGG) by solid‐state reaction of the oxides. The oxides were prereacted at 1350°C, ground, pressed, and sintered at 1650°C, yielding 97% dense samples. Ga 2 O 3 evaporated from the sample surface leaving Gd 4 Ga 2 O 9 that could spall off the sample. For…
Abstract The Poisson's ratios of polyamic acid and polyimide films were determined using a high pressure gas dilatometer. In this technique, a sample is held at constant length and a hydrostatic pressure is applied to the sample. The resulting change in stress on the sample with applied pressure provides a measure of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLattice model for crystal-amorphous interphases in lamellar semicrystalline polymers: effects of tight-fold energy and chain incidence densitySanat K. Kumar and Do Y. YoonCite this: Macromolecules 1989, 22, 8, 3458–3465Publication Date (Print):August 1, 1989Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetism of alternating bimetallic chains: application to triaqua(oxamido-N-benzoato-N-propionato)coppermanganese monohydrateYu Pei, Keitaro Nakatani, Olivier Kahn, Jorunn Sletten, and Jean Pierre RenardCite this: Inorg. Chem. 1989, 28, 16, 3170–3175Publication Date (Print)…
This study was conducted to determine which of eight different extractants best described the K-supplying capacities of nine southern Ontario soils. The total amount of K extracted by eight crops of alfalfa grown in the greenhouse was related to soil K by regression techniques. The following procedures extracted incre…
The μ-carbido dimer [(PcFe)2C] and its derivatives of formula [{(L)PcFe}2C] (L = acetone, pyridine, 4-methylpyridine, 1-methylimidazole, piperidine) have been prepared and studied by IR, Mössbauer, EPR, and NMR spectroscopy and magnetic susceptibility determinations. All of the complexes appear to contain Fe(IV). © 1…
The luminescence of Gd3+ in YOCl is reported. From temperature dependent emission spectra and decay measurements, the Judd–Ofelt parameters Ω2 and Ω6 of Gd3+ in YOCl are obtained: Ω2=2.97×10−23 m2 and Ω6=8.65×10−24 m2. The relative consistency of Ω2 and Ω6 is confirmed by measuring the 8S7/2→6D9/2 and 6I7/2 transition…
Dielectric, optical and elastic properties of dimethylaminaluminiumsulphate crystals were studied. The crystal is shown to undergo a nearly tricritical second order phase transition with the symmetry change 2/m–m at Tc = 150 K. The transition can be classified as a proper ferroelectric one of the order-disorder type.…