Materials Literature
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Abstract Polytrifluoromethylacetylene (PTFMA) was synthesized from trifluoromethylacetylene (TFMA) using a PdCl 2 /DMF catalyst solution or the anionic initiator n ‐butyl lithium. Although PdCl 2 proved to be an effective catalyst for the polymerization of TFMA, long reaction times and poor yields made characterizatio…
A large volume high pressure apparatus has made it possible to grow large single crystals of black phosphorus, P. After converting red P powder into black P under a high pressure of 10 kbar at high temperature, a melt of polycrystalline black P has been gradually solidified to bring about the growth of single crystals…
This article provides a comprehensive review of the theory, practice, and application of electron channeling patterns in the scanning electron microscope. An atlas of indexed channeling maps for the bcc, fcc, diamond cubic, and hcp systems is included with a bibliography of 240 references containing all known publishe…
Standard textbook derivations of the Clausius–Mossotti (Lorentz–Lorenz) relation tend to obscure the physical origin of local-field effects by proceeding from the macroscopic dielectric function of the equivalent homogeneous system to the microscopic parameters of the model. The microscopic and macroscopic aspects can…
Reflection profile functions used or suggested for use in Rietveld refinements with fixed-angle or fixed-wavelength powder diffraction data, obtained with neutrons or with X-rays, are reviewed briefly. The fixed-wavelength X-ray case is considered in detail. In tests of fitting to individual resolved reflection profil…
This review attempts to present the most salient developments of research on organic conductors and superconductors during the past 10 years. A theoretical introduction treats instabilities of quasi-one-dimensional electron systems and associated precursor effects which are relevant to the experimental results on orga…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption and surface-enhanced Raman of dyes on silver and gold solsP. C. Lee and D. MeiselCite this: J. Phys. Chem. 1982, 86, 17, 3391–3395Publication Date (Print):August 1, 1982Publication History Published online1 May 2002Published inissue 1 August 1982https://pubs.acs.o…
The refractive index and the birefringence of GaS x Se 1– x crystals were determined in the range 0.63–20 μ. Generation of the second harmonic of CO 2 laser radiation was used to determine nonlinear optical coefficients. Mixing of radiations from a YAG laser and a tunable -center laser generated the difference frequen…
The results are presented of the theoretical and experimental studies of ferroelectromagnets—crystals with magnetic and ferroelectric ordering. Considerable attention is paid to reviewing the results of the phenomenological analysis of the influence of the magnetoelectric interaction on the thermodynamic properties of…
The major thrust in the area of composite materials has been directed towards the development and study of high performance materials like glass, carbon, kevlar and boron fibres in appropriate polymer or metal matrices. Natural fibres like jute and sisal have the advantage of low cost and are likely to be useful in a…
A wide number and great variety of clinically important cardiovascular implants and devises exist. Some (e.g., catheters) may only contact the blood once, and for a relatively short time; others (e.g., kidney dialyzers and blood oxygenators) may be exposed to blood for hours, while tissue implants (e.g., heart valves…
The specific heat of the linear-chain magnet ${\mathrm{CsNiF}}_{3}$ has been measured at temperatures between 4 and 18 K, in magnetic fields up to 8 kG (0.8 T). A rounded peak is observed in both the temperature and field dependence. The peak positions in the field dependence are in qualitative agreement with classica…
Further calcul.ations have shown that Eqs. ( 1) and (2) in the Letter cannot be applied to the case under discussion, and the approximation men- tioned in Ref. 15 there is incorrect.A better calculation based on the exact solution of Max- well's equations for multiple reflections in ab- sorbing media will be published…
The synthesis of elastomers by step, chain, and ring-opening polymerizations is reviewed. These reactions are characterized as to the process variables which must be controlled to achieve the synthesis and crosslinking of an elastomer of the required structure. Both radical and ionic chain polymerizations are discusse…
Tetragonal and cubic CuFe2O4 are prepared and studied by Mössbauer-effect technique at room temperature and at 4.2 K with and without applied strong magnetic fields. The cation distributions and the hyperfine parameters are determined and compared with magnetization measurements. The results show that tetragonal CuFe2…
The magnetic interaction between local magnetic moments in an insulator or a semiconductor host is theoretically studied. For a dilute concentration of magnetic ions, the dominant mechanism for magnetic interaction could be the exchange polarization of the valence-band electrons of the host lattice. Its properties are…
Results are described for the field and temperature dependences of the electrical resistivity, Hall effect, and transverse magnetoresistance of ferromagnetic, antiferromagnetic, and diamagnetic Heusler alloys. The experiments cover the approximate ranges 2-300 K and 0-4.8\ifmmode\times\else\texttimes\fi{}${10}^{6}$ ${…
The theory of surface-enhanced second-harmonic generation at a metallic grating is developed. Using the form of the nonlinear source polarization given by Bloembergen et al. [Phys. Rev. 174, 813 (1968)], we solve Maxwell's equations to obtain the fields at the second-harmonic frequency. The calculations are done up to…
Abstract Crosslinking efficiency of isotactic polypropylene was studied as a function of the initiator used and of the reaction temperature. The decomposition rate of the initiator was found to be of prime importance for attaining the gel point. The over‐all efficiency of the process is strongly influenced also by the…
We report studies of sputtered iridium oxide films (SIROF's) by differential thermal analysis, evolved-gas analysis, scanning electron microscopy, x-ray diffraction, and electrical-conductivity measurements. SIROF's undergo an irreversible exothermic transition at \ensuremath{\sim}300\ifmmode^\circ\else\textdegree\fi{…