Materials Literature
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Vibrational spectra, most of them obtained from Raman scattering, are reported for LiNO3 and NH4NO3 solutions in liquid ammonia, ranging from dilute to the compositions LiNO3/1.6NH3 and NH4NO3/1NH3. All the spectra were obtained from solutions at ambient temperatures. Large changes in the N–H stretching region are cor…
Abstract The relative amounts of freezing and nonfreezing water in various water‐wet cellulose acetate (CA) membranes were determined by NMR techniques, from the initial heights of the water component in the free induction decay (MNR intensity). The results suggest that (1) a significant fraction of the water in vario…
Abstract Raman scattering is observed in first and second order by optically active phonons in mercury sulphide HgS having the cinnabar structure (α‐HgS). For the first time these spectra could be obtained in polarised light and interpreted using selection rules derived by group theoretical considerations. The experim…
The frequency dependence of the ac conductivity of polycrystalline cobalt-iron ferrite Co 3- x Fe x O 4 (1.89≦ x ≦2.08) has been measured in the frequency range 1 kHz∼200 MHz and the temperature range 130∼300 K. The measured conductivity can be expressed as the sum of two kinds of conductivity σ 1 and σ 2 . σ 1 corres…
The Kerr response of seven nematic substances has been measured just above their nematic-isotropic transition temperature, in their isotropic state. If the reciprocal of the Kerr constant B is plotted against temperature, a linear relationship analogous to the Curie-Weiss dielectric relationship in ferroelectrics is f…
This report shows that magnetically isotropic and anisotropic compacts of BaFe12O19 or SrFe12O19 sinter to high density with controlled microstructure in the presence of a liquid phase. The liquid-phase compositions are in the systems MO–SiO2 and MO–Al2O3–SiO2, M=Ba, Sr. Further, it is shown that systems containing MB…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTungstovanadate heteropoly complexes. IV. Vanadium(IV) complexesC. M. Flynn, Jr. and M. T. PopeCite this: Inorg. Chem. 1973, 12, 7, 1626–1634Publication Date (Print):July 1, 1973Publication History Published online1 May 2002Published inissue 1 July 1973https://pubs.acs.org/d…
Spectral loss measurements performed between 0.5 and 1.15 μm with up to 32-m-long unclad fibers drawn from Suprasil W1, Spectrosil WF, and Corning 7943 synthetic vitreous silica demonstrated that bulk glasses with total losses well below 10 dB/km at certain wavelengths of interest for future optical communication syst…
Individual nitrogenous metabolites have been examined as regulating agents for the breakdown of intracellular proteins in Escherichia coli. Generally, NH(4) (+) is the most effective regulator. Its depletion progressively increases the basal proteolytic rate to maximum in most strains when the doubling time is increas…
A portable hand‐held friction meter has been devised which will measure the coefficient of friction between a reference material and skin at any body site regardless of position. The reference surface can be made of any of a number of materials, such as steel, nylon, PTFE, leather or even fabrics. The effects of disea…
"Nickel and Chromium Plating." British Corrosion Journal, 8(4), p. 147
[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…