Polymorphism of nickel sulfate hexahydrate
NiSO 4 .6H 2 O cristallise dans C 2 /c avec affinement jusqu'a 0,031 ou P4 1 2 1 2 avec affinement jusqu'a 0,045
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The structural and electrical properties of liquid copper selenide
The partial structure factors and radial distribution functions for liquid CuSe have been determined by the isotopic substitution technique and the results compared with those from an earlier study of liquid CuTe. It is shown that, whereas the underlying ionic configuration of CuTe can be written as Cu+Te−, for CuSe t…
Specific Permeability of Porous Compacts as Described by a Capillary Model
The specific liquid permeabilities of a wide variety of phosphatebonded, porous alumina compacts prepared from alumina powders of differing size distribution, and ranging in porosity from 32 to 50 vol%, were not described well by the Carmen‐Kozeny model but were described by a capillary model based on mean entry pore…
Development of a method for integrating time‐dependent constitutive equations with large, small or negative strain rate sensitivity
Abstract A unified numerical method to integrate stiff time‐dependent constitutive equations has been developed. This method is a stable, non‐iterative and self‐correcting solution procedure which works successfully over a wide range in strain rate sensitivity. Time steps are automatically controlled during integratio…
Surface Coupling between Nematic Liquid Crystals and Rubbed Polyimide Substrates for Pure Twist Deformation: Dependence on Rubbing Strength
The optical detection of the surface coupling of nematic liquid crystals (NLCs) with rubbed polyimide substrates subjected to pure twist is described. Transmitted light beams through a cell comprised of homogeneously aligned NLC of a cyanobiphenyl, 5CB, inserted between crossed polarizers are observed as functions of…
X-ray diffraction study of liquid sulfur
The X-ray scattering intensity of liquid sulfur was measured at 130, 155, 180, 210, 240, 270 and 300°C by a reflection method from a free liquid surface. This was carried out using a special inner diffraction chamber as a sample holder. As a result of a radial distribution analysis, the radial functions were obtained…
Iron(IV) phthalocyanines. Moessbauer spectral studies of (.mu.-carbido)(phthalocyaninato)iron(IV) and of its axially ligated and oxidized (Pc.cntdot.+.pi. cation radical) derivatives
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron(IV) phthalocyanines. Moessbauer spectral studies of (.mu.-carbido)(phthalocyaninato)iron(IV) and of its axially ligated and oxidized (Pc.cntdot.+.pi. cation radical) derivativesEddy N. Bakshi, Christopher D. Delfs, Keith S. Murray, Birgit Peters, and Heiner HomborgCite…
Effect of short‐chain branching on the morphology of LLDPE‐oriented thin films
Abstract High‐density polyethylene and randomly branched linear low‐density polyethylene of varying branch length and content were used to produce oriented thin films. Sample morphology was investigated using transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and dynamic mechanical therma…
NMR studies of aD-phase compound
Proton NMR spectra and relaxation times (${T}_{1}$s) at 60 MHz were obtained for the thermotropic compound 4'-n-hexadecyloxy-3'-nitro-biphenylcarboxylic acid, which, upon heating, has the sequence of phases: crystal\ensuremath{\rightarrow}${\mathrm{S}}_{\mathrm{C}}$\ensuremath{\rightarrow}D (or smectic-D)\ensuremath{\…
Structural effects at the ferromagnetic to antiferromagnetic phase transition in Ce(Fe1-xCox)2
Following the recent discovery of a new magnetic phase transition in the Ce(Fe 1-x Co x ) 2 compounds for which x<0.3, the authors report the results of a neutron powder diffraction study on a compound with x=0.20 using HRPD at the Rutherford Appleton Laboratories. Rietveld structure refinements show that the ferromag…
The Polymorphic Structures of a Squarylium Dye. The Monoclinic (Green) and Triclinic (Violet) Forms of 2,4 bis(2-hydroxy 4-diethylaminophenyl)-1,3-cyclobutadienediylium 1,3-diolate
The title compound, a candidate for solar photovoltaic applications, crystallizes in at least two polymorphic structures. Triclinic form: a = 11.911 (4), b = 7.401 (9), c = 6.501 (7) Å, α = 92.78 (7), β = 111.9 (4), γ = 98.08 (6)°, = .046 for 955 reflections with F 0 > 2σ(F 0). Monoclinic form: a = 15.72 (4), b = 7.28…
On the calculation of breakdown voltages for uniform electric fields in compressed air and SF/sub 6/
A novel method is described for calculating the breakdown voltage of uniform field gaps in compressed air and SF/sub 6/ without the need for experiments. This method is based on the criterion of self-recurring single-electron avalanches developed in the gap. It is shown that the results computed by this method for pd…
Pressure-induced structural changes in boron oxide glass
Glassy B2O3 samples annealed at 300 °C at 10 and 15 kbar were densified by 9% and 11%, respectively. Relaxation by subsequent annealing at ambient pressure restored the original density. The structure of the pressurized samples was determined with x-ray diffraction. A new method was developed for eliminating the Compt…
Lead fluoroborate glasses
Glasses containing up to 60-mol % PbF2 have been made in the binary system PbF2-B2O3. The glass transformation and crystallization temperatures, thermal expansion behavior, and electrical conductivity of these glasses have been measured. A corresponding series of lead borate glasses were also studied to provide a basi…
Activity Measurements and Excess Entropy-Volume Relationships for Pyrope-Grossular Garnets
Garnets on the pyrope-grossular join have been synthesized, their unit-cell edges measured, and the activity of $$Ca_{3}Al_{2}Si_{3}O_{12}$$ component in $$Pyr_{85}Gr_{15}$$ determined experimentally at 1000°C. There is no significant departure from ideal volume mixing in the composition range 0 to 21 mole% $$Ca_{3}Al…
Laboratory synthesis of hydrogenated amorphous carbon films
Hydrogenated amorphous carbon (HAC) films have been prepared by direct condensation of cool carbon vapor at low temperatures. Quantitative absorption coefficients for these films have been obtained between 0.16 and 20 microns. Spectra of HAC at 3.4 microns are quite similar to those seen in comet Halley and in the Gal…
Constant-stress molecular dynamics: The phase diagram of silver iodide
The method of constant-stress molecular dynamics using the Parrinello-Rahman Lagrangian is described, particularly as applied to Coulomb systems. The method is used to simulate the phase behavior of silver iodide. The \ensuremath{\beta}, \ensuremath{\alpha}, rocksalt, and liquid phases are reproduced and the boundarie…
Structure, dynamic nuclear magnetic resonance study, and magnetic properties of the two novel chains [Cu(paphy)X](PF6).cntdot.H2O (paphy = pyridine-2-carboxaldehyde 2-pyridylhydrazone; X = Cl, Br). Synthetic strategy of one-dimensional systems of copper(II)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure, dynamic nuclear magnetic resonance study, and magnetic properties of the two novel chains [Cu(paphy)X](PF6).cntdot.H2O (paphy = pyridine-2-carboxaldehyde 2-pyridylhydrazone; X = Cl, Br). Synthetic strategy of one-dimensional systems of copper(II)Teofilo Rojo, Jose…
The octagonal quasilattice and electron diffraction patterns of the octagonal phase
An analysis is given of the dual transformation and also the strip method which can yield the ideal octagonal quasilattice as well as its approximants. An ideal octagonal tiling consisting of 45° rhombi and squares can be derived from the projection of a 4D cubic lattice within an irrational 2D subspace onto an irrati…
Structural and Photoluminescence Characterization of CdS/GaAs Films and CdS-ZnS Strained-Layer Superlattices Grown by Low-Pressure MOCVD Method
Single-crystalline CdS films have been epitaxially grown on (100) and (111)A and B GaAs substrates at temperatures between 200 and 350°C by a low-pressure metalorganic chemical-vapor-deposition (MOCVD) method using (CH 3 ) 2 Cd and H 2 S gases. The (100)-oriented film exhibits perfectly cubic modification, but contain…