Materials Literature
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The ground-state electronic structure in various magnetic phases of the Jahn-Teller-distorted perovskite ${\mathrm{KCuF}}_{3}$ has been investigated using the ab initio periodic unrestricted Hartree-Fock approach. The material is correctly predicted to be an orbitally ordered wide band-gap insulator with effectively o…
Improvements in the processability of polypyrrole —a relatively air‐stale organic conducting polymer—can be obtained by producing colloidal dispersions. The particles reported here are “inside out”, i.e., micrometer‐sized, sterically stabilized polystyrene latex particles are coated wh an outer layer of polypyrrole. T…
In this paper, the results of a recent investigation of the dependence of the induced piezoelectric activity on temperature, electric bias field, and frequency and the electrostrictive response in the relaxor ferroelectric lead magnesium niobate-lead titanate ceramics ( (1- x )(Pb(Mg 1/3 Nb 2/3 )O 3 )- x (PbTiO 3 )) a…
Abstract Structural changes of tussah ( Antheraea pernyi ) silk fibroin films treated with different water‐methanol solutions at 20°C were studied as a function of methanol concentration and immersion time. X‐ray diffraction measurements showed that the α‐helix structure, typical of untreated tussah films, did not cha…
Lead zirconate titanate (PZT) ceramics with Zr/Ti ratios between 95/5 and 55/45 have been examined by transmission electron microscopy (TEM), dielectric spectroscopy, Sawyer‐Tower polarization techniques, and dilatometric measurements. The relative phase stability in the high‐Zr‐content end of the PZT phase diagram is…
Electronic properties of icosahedral quasicrystals have been often discussed on the basis of the valence band structure of their cubic 1/1 approximants for which the band calculations are available. However, there exists no a priori justification for the neglect of the difference between the quasicrystal and its lowes…
Systematic neutron-diffraction experiments have been performed on metal oxide modified borate glasses, ${\mathit{xM}}_{2}$O-${2\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ with M=Ag,Li,Na, in order to investigate the short- and intermediate-range structure. The short-range order of the boron-oxygen network, involving the first…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAggregation of Methylene Blue Adsorbed on Starburst DendrimersSteffen Jockusch, Nicholas J. Turro, and Donald A. TomaliaCite this: Macromolecules 1995, 28, 22, 7416–7418Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1…
A novel method is demonstrated which yields a spherical ZrO 2 powder of narrow size distribution through heating of a zirconyl chloride solution with an alcohol–water mixture as the solvent. The kind and composition of the solvent mixture greatly influenced the behavior of the precipitation and the morphology of the r…
The data available in the literature on the lattice parameters of boron nitride (BN) polymorphic modifications have been analysed. A precise measurement of interplanar spacing has been carried out for hexagonal BN of different degrees of crystalline perfection and rhombohedral BN. The possibilities for alteration of w…
Electrochemical, spectroscopic, and structural measurements were used to characterize the electrochromic behavior and stability of electrodeposited thin films. These films are prepared from metal/hydrogen peroxide solution on transparent conductive glass ( i.e. , ITO). The as‐deposited films are partially crystalline…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Properties of Low Molecular Weight PolyphosphazenesYoun Soo Sohn, Yang Ha Cho, Hyounggee Baek, and Ok-Sang JungCite this: Macromolecules 1995, 28, 22, 7566–7568Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published iniss…
An atomically resolved STM study has been carried out on sputtered thin films of pure iron polarized at high anodic potentials in borate buffer solution, pH 8.4. Ex situ examination in air showed long‐range crystalline order on the film surfaces, with the same triangular lattice of spacing appearing on all the crystal…
A previously developed thermodynamic model of hydro‐thermal synthesis of ceramic powders has been extended to include cases when solid solutions are formed. The model has been applied to the synthesis of a series of lead titanate zirconate solid solutions PbZr x Ti 1– x O 3 (PZT, 0.46 < x ≤ 0.75). It predicts the o…
SUMMARY To extract quantitative electronic structure information from electron energy‐loss near‐edge structure typically necessitates the separation of spectra into linearly independent components. For this to be accomplished, certain conditions need to be met concerning the localization of chemical bonding and the li…
We use transient differential absorption experiments to investigate the ‘‘single dot’’ absorption line shape of CdSe quantum dots. We observe both a narrow (full width half maximum ∼5 meV) and a broad (∼50 meV) bleach component within the inhomogeneously broadened first absorption line of our samples. We deduce the si…
The composition of whole human and sheep cortical bone tissue, and of a synthetic hydroxyapatite (P120), were compared using Fourier transform Raman (FT-Raman) spectroscopy. Deproteination procedures to remove the bulk of the collagen present in bone tissue allowed isolation of the mineral phase. A comparison of the s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEXAFS and X-ray powder diffraction studies of the spin transition molecular materials [Fe(Htrz)2(trz)](BF4) and [Fe(Htrz)3](BF4)2.H2O (Htrz = 1,2,4-4H-triazole; trz = 1,2,4-triazolato)Alain Michalowicz, Jacques Moscovici, Bernard Ducourant, Denis Cracco, and Olivier KahnCite…
Knowledge of the orientations of several α plates inherited from the body-centred-cubic–hexagonal-close-packed phase transformation of a β grain allows us to determine the orientation of the latter, provided that a strict orientation relation between the two lattices exists. This contribution discusses the problem of…
The Compton scattering cross section on the proton has been measured at laboratory angles of 90\ifmmode^\circ\else\textdegree\fi{} and 135\ifmmode^\circ\else\textdegree\fi{} using tagged photons in the energy range 70--100 MeV and simultaneously using untagged photons in the range 100--148 MeV. With the aid of dispers…