Materials Literature
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Molecules and assemblies therefrom with strictly vanishing multipolar-like tensorial susceptibilities of given orders are defined in general, following group theoretical prescriptions. This approach leads, in the case of quadratic nonlinear optical properties, to a new class of molecules with strictly vanishing dipole…
Abstract It is shown that poly(3‐alkylthiophene)s may readily crystallize from poor solvents in the form of whiskers. The experimental conditions required for the formation of whiskers were found to depend upon the alkyl side‐chain length, solvent quality, and temperature. In all cases studied for alkyl side‐chain len…
. The crystal structure of a ternary complex containing the catalytic subunit of cAMP-dependent protein kinase, ATP and a 20-residue inhibitor peptide was refined at a resolution of 2.2 A to an R value of 0.177. In order to identify the metal binding sites, the crystals, originally grown in the presence of low concent…
A complete description of the first‐order Raman and Brillouin spectra of single‐crystal aluminum nitride is provided. The frequency has been measured and the symmetry identified of each of the Raman‐active zone‐center optic modes, and the five independent elastic constants have been measured. The widths of the princip…
We have previously described a novel monocrystalline iron oxide nanocompound (MION), a stable colloid that enables target specific MR imaging. In this study, the physicochemical properties of MION are reported using a variety of analytical techniques. High resolution electron microscopy indicates that a MION consists…
Abstract The current status of organic low‐molecular weight and polymeric materials for third‐order nonlinear optics is reviewed. The importance of organic materials lies in their promise of large nonlinear optical figure of merit, high optical damage thresholds, ultrafast optical responses, architectural flexibility,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical aspects of solution routes to perovskite-phase mixed-metal oxides from metal-organic precursorsClive D. Chandler, Christophe. Roger, and Mark J. Hampden-SmithCite this: Chem. Rev. 1993, 93, 3, 1205–1241Publication Date (Print):May 1, 1993Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNarrow molecular weight resins by a free-radical polymerization processMichael K. Georges, Richard P. N. Veregin, Peter M. Kazmaier, and Gordon K. HamerCite this: Macromolecules 1993, 26, 11, 2987–2988Publication Date (Print):May 1, 1993Publication History Published online1…
Data on the synthesis, structures and properties of ionic, coordination, organometallic and organoelement compounds with liquid-crystal properties are surveyed. The substances examined are new in the chemistry of the liquid-crystal compounds. Their potential applications are described. The bibliography includes 211 re…
Amorphous boron nitride, BN, is obtained from the reaction of B-trichloroborazine, (BCINH)(3), with cesium metal. The amorphous product is converted to a turbostratic form upon heating to 1100 degrees C. Scanning electron microscopy reveals a previously unreported morphology composed of hollow tubular structures. The…
The theoretical investigation of the inner 3s photoionization of the Mn atom with dependence on both the spin of the residual ion and multielectron correlation influence is performed for the first time. A set of characteristic features in this dependence is discovered. The features are considered to be common features…
NaCdIn2(PO4)3, a new phase with an alluaudite-type structure, has been synthesized by solid-state reaction. The unit-cell is monoclinic, space group C2/c. Parameters refined from the X-ray powder diffractogram are a = 12.519(2), b = 12.959(3), c = 6.575(1) A, β = 115.17(1)°. The combined results of X-ray Rietveld refi…
The formation of phases at high temperature in the (Na 1−x K x )GaSiO 4 system has been investigated by powder X-ray diffraction. Solid solutions of the beryllonite and KAlGeO 4 types form for Na-rich and K-rich compositions, respectively. A new phase with a hexagonal (√3 A,C) kalsilite superstructure forms at interme…
The phase transition in chlorapatite from the monoclinic ferroelastic to the hexagonal paraelastic phase has been investigated with X-ray and synchrotron-radiation diffraction as well as optical and thermal methods. In the ferroelastic phase the spontaneous strain is 0.40.10 3 at room temperature and 0.26.10 3 at 192…
The pressure P derivative dT C /dP of the Curie temperature T C , the linear magnetostriction Delta l/l at 4.2 K, the lattice parameters a and c as functions of temperature T and the high-temperature paramagnetic susceptibility chi of CrTe have been measured. The value of dT C /dP is found to be -7.0+or-0.2 K kbar -1…
Epitaxial La0.5Sr0.5CoO3 films with very smooth surface morphology were grown on (100) SrTiO3 and (100) MgO substrates by pulsed laser deposition. Scanning tunneling microscopy reveals that the thin film is formed by the coalescence of many aligned square mesas. The growth proceeds from the edges of terraces which are…
We have used Raman scattering to evaluate thick epitaxial GexSi1−x layers with 0.20≤x≤0.43 grown on Si (100) substrates. We show that a detailed consideration of the composition dependencies of the relative intensities of the various phonon modes can enhance the sensitivity of Raman scattering to variations in composi…
Fullerene tubular structures can be generated by vapor condensation of carbon on an atomically flat graphite surface. Scanning tunneling microscope (STM) images revealed the presence of tubes with extremely small diameters (from 10 to 70 angstroms), most of which are terminated by hemispherical caps. Atomic resolution…
X-ray microanalysis is a widely used technique in studies of cell and tissue elemental composition. It has applications in many different areas of biology, including animal and plant cell physiology, medicine, pathology and studies on environmental pollution. The author presents an up-to-date look at the use of X-ray…
Quasiperiodic self-similar chains generated by substitutions (i.e. deterministic concatenation rules) and their diffraction spectra are analysed in a systematic fashion, from the viewpoint of the superspace formalism. A substitution acting on n objects generates quasiperiodic chains if, and only if, the associated sub…