Materials Literature
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The formation of vapor‐deposited TiB 2 , ZrB 2 , and HfB 2 at 1400°C was studied with respect to the influence of process variables on structure and stoichiometry. Stoichiometric, nonporous deposits of TiB 2 were obtained; ZrB 2 and HfB 2 deposits contained β‐rhombohedral boron. Precision lattice parameters were deter…
The crystal structure of dalyite, a potassium (sodium) zirconium silicate K 1.70 Na 0.30 ZrSi 6 O 15 , has been determined and refined by two-dimensional Fourier methods. It is a new type of sheet silicate containing four, six- and eight-memebered rings of SiO 4 tetrahedra. The sheets are joined by ZrO 6 octahedra and…
The extent and nature of solid solution formation in the system urania‐gadolinia were investigated. Compositions sintered in hydrogen, in argon, and in air were analyzed by chemical and X‐ray methods. Extensive solid solution exists between uranium dioxide and gadolinium sesquioxide. Some anomalies in the lattice para…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure Effects on Glass Transition in PolymersUmberto BianchiCite this: J. Phys. Chem. 1965, 69, 5, 1497–1504Publication Date (Print):May 1, 1965Publication History Published online1 May 2002Published inissue 1 May 1965https://pubs.acs.org/doi/10.1021/j100889a010https://do…
It is shown experimentally that, for practical purposes, the geometrical properties of worsted 1 × 1 rib fabrics can be described by sets of k values similar to those used for plain-knitted fabrics. The results obtained are fitted to a simple model of the 1 × 1 rib stitch based on Leaf's model of the plain-knitted loo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric Properties of Polyanion—Polycation ComplexesAlan S. Michaels, Gary L. Falkenstein, and Nathaniel S. SchneiderCite this: J. Phys. Chem. 1965, 69, 5, 1456–1465Publication Date (Print):May 1, 1965Publication History Published online1 May 2002Published inissue 1 May 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Magnetic Moments of Some Tetragonal Nickel ComplexesA. B. P. LeverCite this: Inorg. Chem. 1965, 4, 5, 763–764Publication Date (Print):May 1, 1965Publication History Published online1 May 2002Published inissue 1 May 1965https://pubs.acs.org/doi/10.1021/ic50027a041https://…
The Monte Carlo method described by Green in 1963 has been used to investigate the scattering of 29 kev electrons in a copper target. The results are compared with experimental data and are used to suggest how theoretical expressions obtained for an infinite solid may be modified to apply to the practical case of a se…
The magnetostriction of CoO single crystals were measured along three principal crystallographic directions in fields up to 11 KOe. The magnetostriction appears from ten degrees below the Néel temperature. The magnetostriction observed at liquid air temperature is strongly dependent on an applied field and can be desc…
Abstract A microinterferometric method was used to measure the diffusion coefficient as a function of concentration in the system dimethylformamide‐polyacrylonitrile at 25°C. The diffusion coefficient increases with increasing polymer concentration up to the maximum employed, 17.72% by weight. The theoretical basis fo…
A method is presented for the analysis of relaxation spectra resulting from Maxwell-Wagner interfacial polarization in sintered oxide compacts. Using a multilayer model to represent ferric oxide pellets, containing heterogeneities induced by the sintering process, a distribution function of the relaxation times is der…
Abstract Simultaneous population and mass balances have been solved together with a generalized form of nucleation‐growth rate kinetics to obtain the form of crystal size distribution (CSD) for several idealized modes of crystallizer operation, including seed crystal removal, product classification, arbitrary solids c…
The transfer of the glucosyl moiety from uridine diphosphate glucose in the presence of Acetobacter xylinum cell-free extracts led to the formation of a mixture of alkali-soluble and -insoluble cellodextrins. Typical cellulose fibrils could not be detected by electron microscopy in this product. Immediately after rele…
The problem of computing the phonon distribution and thermal conductivity in the presence of N processes is examined in the framework of the Boltzmann-Peierls equation. A heat flow may be associated with drift and diffusive distributions respectively; this intuitive concept is given specific mathematical basis as a na…
The crystal structure of Mg 2 P 2 O 7 reported by Lukaszewicz has been refined by least squares analysis. Data of the hkl type with O ≤ k ≤ 6 have been used to obtain improved atomic parameters. The central oxygen atom of the P 2 O 7 −4 is found to have enhanced thermal motion in the plane perpendicular to the P—P vec…
The elastic stiffness coefficients of single-crystal iron have been measured at room (300°K) and liquid-nitrogen (77°K) temperatures using the ultrasonic pulse-echo technique. The three coefficients were determined from a total of seven independent modes. The values at 300°K are C11=2.28±0.02, C12=1.32 ±0.04, and C44=…
β-Zn 2 P 2 O 7 crystallizes in the C2/m space group with lattice parameters a = 6.61 ± 0.01 Å, b = 8.29 ± 0.01 Å, c = 4.51 ± 0.01 Å, β = 105.4° ± 0.2° and z = 2. The anion, P 2 O 7 −4 , is centered with its mirror plane coinciding with the mirror plane of the space group. The central oxygen atom, however, shows high a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand Field Strength of the Nitrogen End of Cyanide and Structures of Cubic Cyanide PolymersD. F. Shriver, Shirley A. Shriver, and Stanley E. AndersonCite this: Inorg. Chem. 1965, 4, 5, 725–730Publication Date (Print):May 1, 1965Publication History Published online1 May 200…
Abstract The submicroscopic morphology of uniaxially deformed isotactic polypropylene films has been examined by x‐ray diffraction, infrared dichroism, birefringence, sonic modulus, small‐angle light scattering, density, and electron microscopic techniques. Several new theoretical relationships and techniques have bee…
The Preisach model for magnetic particle interaction in recording tapes is used as a basis for the calculation of the frequency response of the ac biased magnetic recording process. These results are compared with experiment. Since there are numerous other factors present in normal tape recording which affect the freq…