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An experimental study of the organic charge-transfer salt $N$-methyl-phenazinium tetracyanoquinodimethan (NMP-TCNQ) is presented. Magnetic-susceptibility, specific-heat, spin-resonance, and conductivity measurements indicate a metallic state above 200 \ifmmode^\circ\else\textdegree\fi{}K with a continuous transition t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility of potassium halides in fused acetamideRichard A. WallaceCite this: Inorg. Chem. 1972, 11, 2, 414–415Publication Date (Print):February 1, 1972Publication History Published online1 May 2002Published inissue 1 February 1972https://pubs.acs.org/doi/10.1021/ic50108a04…
X-ray diffraction methods are applied to determine the cation distribution and the oxygen positional parameter in low-substituted magnetites with Al3+, Ga3+, or In3+ as substituents. It is possible to conclude that the tetrahedral site preference increases in the sequence Al3+, Fe3 +, In≃Ga3+, in good agreement with m…
Abstract Measurements are reported which show that the room-temperature nematic MBBA can be deformed by means of curvature electricity if it is contained in a thin sandwich cell with the electric field parallel and the unique axis normal to the bounding walls. Meyer's coefficient e 33 was determined to be 4 · 10 -5 dy…
For Pt. I see ibid., vol. 4, 625 of 1971 The potential distribution inside three equidiameter coaxial cylinders separated by finite distances has been used to calculate the focal lengths, mid focal lengths and spherical aberration coefficients of some triple cylinder einzel lenses. The lenses considered have the lengt…
Boron arsenide, a semiconductor with an energy gap of 1.46 eV, decomposes irreversibly at temperatures above 900 °C, thus limiting the temperature of the crystal growth process. In this work, single crystals of boron arsenide, identified by the x-ray diffraction method, have been prepared by the chemical transport of…
Abstract The bandwidth at one‐half maximum intensity of the Raman‐active CO stretching vibration was found to correlate with density in poly(ethylene terephthalate). This correlation is valid for unoriented as well as highly oriented materials. It is suggested that a number of rotational states of the terephthalate s…
A phenomenological theory of the electromechanical properties of various types of oxygen-octahedra ferroelectrics is presented. The electrostrictive constants reduced to those of the perovskite-type oxide are nearly constant with the values Q11p≈0.10 m4/C2, Q12p≈−0.034 m4/C2, and Q44p≈0.029 m4/C2. These constants are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMie scattering by optically active particlesDavid J. GordonCite this: Biochemistry 1972, 11, 3, 413–420Publication Date (Print):February 1, 1972Publication History Published online1 May 2002Published inissue 1 February 1972https://pubs.acs.org/doi/10.1021/bi00753a018https://…
When a large pitch cholesteric is held between parallel glass plates a distance d apart, near the isotropic transition, a characteristic striped pattern appears. The distance between stripes is about the half pitch p oo/2 (providing d > p oo) and the texture has no measurable optical rotatory power. It does not appear…
Abstract Bound rubber measurement may be very misleading as a measure of elastomer–carbon black interaction because sometimes only part of the apparently bound rubber is truly adsorbed on the carbon black surface. A theory is proposed which utilizes bound rubber measurements, but separates truly adsorbed rubber from o…
Abstract Polyethyleneimine and its acyl derivatives have been thiolated with thiobutyrolactone and the SH groups introduced have been crosslinked in the presence of and in the absence of methyl orange, respectively. After crosslinking of the polymers, the bound methyl orange was removed. The resultant two kinds of cro…
Abstract Transition temperatures by thermo‐optical analysis (TOA) and by DSC were measured on films of polystyrene (PS), poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO resin) and nine homogeneous blends of these polymers. The TOA procedure consists of automatically monitoring light transmission through birefringent scrat…
We wish to report on a simple method for measuring the birefringence and indices of refraction of nematic liquids with an accuracy comparable with or superior to previously reported means.(1–3) The method is exemplified in measurement of the temperature dependences of the indices of refraction of p-methoxybenzylidene…
The electrical and optical properties of EuO are studied in order to help determine conduction mechanisms. A strong relationship between growth parameters and electrical behavior is noted. Free-carrier absorption below the band edge in energy is observed in moderately conducting crystals. By comparing optical and elec…
Electron conduction in single crystals of Nb${\mathrm{Se}}_{2}$ has been measured at 4.2\ifmmode^\circ\else\textdegree\fi{}K in magnetic fields up to 150 kOe. The upper critical field ${H}_{c2}$ has been measured as a function of the angle between the applied field and the layers of the crystal for currents flowing bo…
The temperature dependence of paramagnetic resonance frequencies in a short range ordered spin state is studied theoretically and experimentally for two typical one-dimensional Heisenberg antiferromagnets, CsMnCl 3 2H 2 O and (CH 3 ) 4 NMnCl 3 . The present theory with the classical nearest-neighbor Heisenberg model p…
The theory of the homogeneous interacting electron gas is used to derive a functional of the density for the form factor for incoherent scattering of x rays by a statistical atom. The results show a dramatic improvement over an early calculation of Heisenberg who used the Thomas-Fermi model. Detailed calculations of f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleDetailed nature of the six-coordinate polyhedra in tris(bidentate ligand) complexesEdward I. Stiefel and Gary F. BrownCite this: Inorg. Chem. 1972, 11, 2, 434–436Publication Date (Print):February 1, 1972Publication History Published online1 May 2002Published inissue 1 February 1…
Equilibrium H,O pressure (POH.O) was fixed at values less than total pressure (PT) in melting experiments on mixtures of 1921 Kilauea tholeiite, H,O, and CO, (58-5 mole per cent H,O, 41-5 mole per cent CO,), buffered by Ni+NiO. New determinations of the beginning of melting of mixtures of 1921 Kilauea tholeiite and H,…