Materials Literature
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Gainesite, hypothetical end-member Na2Zr2[Be(PO ic], a : 6.567(3), c : 17.1196)4, Z = 2, tetragonal, space grottp l41lamd, is a new species from the Nevel (Twin Tunnels) pegmatite, Newry, Oxford County, Maine. Crystals occur as up to I mm simple tetragonal bipyramids with p{l11} dominant. The color is delicate pale bl…
Abstract High cis ‐1,4 ‐polybutadiene has been used to prepare toughened polystyrene in an attempt to improve its low temperature impact properties. A range of physical and mechanical properties was obtained by keeping the amount of rubber and the polymerization conditions constant, and varying the rate of agitation i…
Structure studies on the segmented polyurethane-urea based on poly(tetramethylene glycol), 4,4'-diphenylmethane diisocyanate, and 4,4'-diaminodiphenylmethane have been made using wide- and small-angle x-ray diffraction. It was found that the hard segments have a well-defined crystal structure indexed by a monoclinic u…
Both neutron diffraction and Mössbauer investigation reveal that CsFeS 2 remains paramagnetic down to 70 K, at which a sudden first order magnetic and structural phase transition takes place. Antiferromagnetic coupling of spins both along the c -axis and along the diagonal direction in the a - b plane of the orthorhom…
Inspection of uncoated insulating samples in a scanning electron microscope (SEM) is possible by using low beam voltages in order to minimize charging effects. In this paper, the principal parameters affecting the target potential under bombardment by electrons are considered. The influence of primary beam energy and…
<mml:math><mml:mrow><mml:mo>(</mml:mo><mml:mn>111</mml:mn><mml:mo>)</mml:mo><mml:mo>[</mml:mo><mml:mn>1</mml:mn><mml:mover><mml:mn>1</mml:mn><mml:mi>¯</mml:mi></mml:mover><mml:mn>0</mml:mn><mml:mo>]</mml:mo></mml:mrow></mml:math> crystals of pure Cu–Al203 (particle size < 200 nm) have been strained between 5 and 204%…
Dynamic recrystallization (DRX) of Cu single crystals during tensile deformation in creep at elevated temperatures (0·6 ≤ T/T m ≤ 0·9) was investigated. At very high temperatures (T ≤ 0·8 T m), DRX occurred after steady state creep had been attained, while DRX commenced before deformation became stationary for lower d…
A procedure for Rietveld refinement from Debye–Scherrer X-ray diffraction patterns is described, in which the effects of instrumental aberrations on the peak shapes and positions are calculated and incorporated into the refinement model. These aberrations, neglected in previous Rietveld refinement programs, can produc…
Abstract The elastic field of a dislocation piercing the interface of an anisotropic bicrystal is obtained for the general case of a dislocation line refracted at the interface. The theory is based on the method of dislocation‐line force fans which reduce the three‐dimensional elastic field of the dislocation in the b…
Boundary surface films of monomolecular thickness of polyvinyl alcohol PVA deposited in a specific way onto transparent ITO or TAO electrodes induced parallel alignment of most available nematic liquid crystals having positive dielectric anisotropy. Chemisorption of PVA is improved by a previous ethyl silicate immersi…
<mml:math><mml:mrow><mml:mo>(</mml:mo><mml:mn>111</mml:mn><mml:mo>)</mml:mo><mml:mo>[</mml:mo><mml:mn>1</mml:mn><mml:mover><mml:mn>1</mml:mn><mml:mi>¯</mml:mi></mml:mover><mml:mn>0</mml:mn><mml:mo>]</mml:mo></mml:mrow></mml:math> crystals of pure Cu and Cu–Al2O3 (particle size < 200 nm) have been subjected to rolling…
Our work with gratings in dielectric image guide shows that it is distinctly advantageous to place the grating notches on the sides of the guide, or on the top of the guide, depending on the mode used. Means are discussed for modeling gratings using an equal-line-length transmission-line equivalent circuit. Excellent…
The increase in the electrical resistance of the specimen, associated with the α→ω transformation in Ti, has been used to obtain the fraction ζ of the ω phase as a function of time under isobaric–isothermal conditions in the pressure range 4–9 GPa and at 300±3 K. In the entire pressure range ζ–t data fit an equation o…
1. Introduction. In order to provide a continuum mechanical model for capillarity, the Dutch physicist D
The two-band transport model is expanded in order to analyze the Hall mobility of p-type III–V compound semiconductors. Using this model, the drift and the Hall mobilities can be calculated separately. The alloy scattering as an additional scattering mechanism in alloy semiconductor systems is assumed and the Hall mob…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(methacrylic acid) derivatives. 7. Chiroptical properties of optically active poly(N-methacryloyl-L-alanine) and poly(N-methacryloyl-L-alanine-co-N-phenylmethacrylamide)Joelle Morcellet-Sauvage, Michel Morcellet, and Claude LoucheuxCite this: Macromolecules 1983, 16, 10,…
Charlesite, ideally Ca 6 (Al,Si) 2 (SO 4 ) 2 (B(OH) 4 )(OH,O) 12 .26H 2 O, is the Al analogue of sturmanite. Hexagonal, probable space group P31c, with a = 11.16(1), c = 21.21(2)angstrom.--Modified journal abstract.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and spectroscopic studies of some metal derivatives of hemiporphyrazineD. Attanasio, I. Collamati, and E. CervoneCite this: Inorg. Chem. 1983, 22, 22, 3281–3287Publication Date (Print):October 1, 1983Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA photoelectron spectroscopic study of the zirconium monohalide hydrides and zirconium dihydride. Classification of metal hydrides as conventional compoundsJohn D. Corbett and Henry S. MarekCite this: Inorg. Chem. 1983, 22, 22, 3194–3202Publication Date (Print):October 1, 19…
Examination of type material showed that 8 taxa must be reduced to synonomy with Thalassiosira punctigera (Castr.) comb, nov., an extremely variable species as to size and valve structure. Preliminary experiments indicated a certain relationship between the areola size and the temperature at which clonal cultures had…