Materials Literature
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[001] electron diffraction patterns of MgAl2O4 spinel show (hk0) reflections with h + k = 4n + 2 ((200), (420), etc.) that violate the accepted Fd3m space group of this material. Since these ‘forbidden’ reflections cannot be attributed to double diffraction, non-zero Laue zones, or a second phase, this result is consi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrins. XXIX. Crystal and molecular structure and luminescence of bis(dimethylamine)etio(I)porphinatorhodium(III) chloride dihydrateLouise Karle. Hanson, Martin. Gouterman, and Jonathan C. HansonCite this: J. Am. Chem. Soc. 1973, 95, 15, 4822–4829Publication Date (Print)…
The crystal structure of potassium chloroptatinate, K2PtCI6, has been refined from both single-crystal and powder X-ray diffraction data. The system is cubic, space group Fm3m with a= 9.751 +_ 0.005 A. The measured density is 3-47 + 0-01 g cm -a and the calculated density for Z = 4 is 3.478 g cm -3. Interatomic distan…
Abstract Permeability data were obtained for commercial regenerated cellulose (Cuprophan PT–150) in isotonic saline at 37°C in a dual closed‐loop dialysis cell. Eighteen radioactively labeled monodisperse solutes of widely differing chemical and physical properties, and ranging in molecular weight from 60 (urea) to 13…
Abstract The crystal structure of nylon 12 was determined from the X‐ray diffraction patterns of uniaxially oriented specimens. The unit cell is monoclinic (pseudo‐hexagonal) with the following dimensions: a = 4,79 Å, b = 31,9 Å (fiber axis), c = 9,58 Å, β = 120°. There are four monomeric units in the unit cell and th…
The nonlinear volt‐ampere characteristics and small‐signal ac capacitance and resistance of sintered ZnO containing 0.5 mol% Bi 2 O 3 were measured. Many of the electrical properties are related directly to the microstructure, which consists of conductive ZnO grains separated by a continuous amorphous Bl 2 O 3 , phase…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUpper and Lower Critical Solution Temperatures in Polystyrene Solutions. IIS. Saeki, N. Kuwahara, S. Konno, and M. KanekoCite this: Macromolecules 1973, 6, 4, 589–593Publication Date (Print):July 1, 1973Publication History Published online1 May 2002Published inissue 1 July 1…
Abstract Phonon‐dispersion branches for specific directions of the wavevector, one‐ and two‐phonon densities, and the lattice specific heat C v have been calculated for NaNO 3 using the same lattice dynamical model which was applied recently to trigonal CaCO 3 . The results of the calculations are compared with availa…
The temperature dependence of an order parameter associated with the 110.9-K displacive phase transition in ${\mathrm{K}}_{2}$Re${\mathrm{Cl}}_{6}$ is measured directly in the tetragonal phase using rotation patterns obtained from nuclear Zeeman quadrupole resonance studies on single crystals. The measurements extend…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure-activity relations of fibrinolytic 1,.omega.-diphenyl-1,.omega.-alkanediaminesLeonard J. Fliedner Jr., Melvyn J. Myers, Joseph M. Schor, and Irwin J. PachterCite this: J. Med. Chem. 1973, 16, 7, 749–754Publication Date (Print):July 1, 1973Publication…
Values provided by three different theories of the diffraction by gratings are compared with measurements made at millimetre wavelengths. The results based on the integral equation method of Pavageau and Bousquet give the best agreement with the experimentally-determined shapes of Wood anomalies. The wavelength depend…
This paper, in general terms, treats the morphology of spunbonded nonwovens as related to fabric properties and de scribes some characterization techniques which have been useful in establishing mophological structure. A generalized description of spunbonded processes is given. The dependence of fabric functional prop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRayleigh Scattering from Solutions of Critically Branched PolycondensatesW. Burchard, K. Kajiwara, M. Gordon, J. Kálal, and J. W. KennedyCite this: Macromolecules 1973, 6, 4, 642–649Publication Date (Print):July 1, 1973Publication History Published online1 May 2002Published…
Abstract The weathering of biotite in soils formed in saprolites derived from granite and gneiss was studied. The soils occurred in the Southwestern Upland of Nigeria which is characterized by a humid tropical climate. Vermiculite and montmorillonite are the usual products of biotite weathering in well‐drained tempera…
A combination of Knudsen effusion and mass spectrometric techniques has been employed in studying the gaseous species in thermodynamic equilibrium with condensed CeO2 and with condensed Ce–CeO2 mixtures. A thermodynamic treatment of ion currents yields a value of ΔH°298=135±6 kcal mole−1 for the heat of vaporization o…
The energy analyzer described is of the spherical mirror-spherical grid retarding potential type. It obtains high resolution through a small energy overlap between low energy pass and high energy pass filter functions. The first filter is a spherical electron mirror operating slightly off-axis in a reflection mode. Th…
A biaxial split Hopkinson bar which operates in simultaneous compression and torsion is described. The device utilizes torsional stress waves generated by release of a stored torque and compressive waves generated by mechanical impact of a long rod onto a loading bar. The torque is released by capacitive discharge exp…
The objectives are to examine the variation of these properties with organic content and to compare the behavior of mechanical mixtures with that of natural samples of comparable organic content. The effect of mineralogy is also studied to check its possible influence on mechanical behavior and on the organic content…
Abstract The effect of the addition of certain low molecular weight compounds to highly crosslinked epoxy resins was investigated. The behavior which is known as antiplasticization, such as increases in modulus and yield strength and the elimination of β‐transition, was observed in the highly crosslinked system as wel…
Abstract The crystal structure of Ca 3 (VO 4 ) 2 is rhombohedral with space group R 3 c and unit-cell parameters a = 14.124(1) Å and α = 44.96(2)°, with equivalent hexagonal axis lengths of a = 10.809(1) and c = 38.028(9) Å. The rhombohedral cell contains seven formula units. The structure was refined by full-matrix l…