Materials Literature
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Measurements of the asymmetry (Sherman) function for gold as a function of foil thickness have been made in a ``classical'' electron double-scattering experiment. Results are presented for incident energies of 50 and 120 keV at scattering angles of 45\ifmmode^\circ\else\textdegree\fi{}, 60\ifmmode^\circ\else\textdegre…
Ferroelectric relaxor characteristics are discussed in conjunction with the disordered arrangement of the constituent ions. Dielectric properties are characterized by giant and temperature-insensitive dielectric constants and large frequency dependence (dielectric relaxation). These properties are consistently explain…
The development of a sound physical view regarding crack quasi-stability during subcritical crack extension still remains challenging. It is evident that further progress requires exploration of the refined micromechanical processes of fracture. The present study emphasizes the experimental findings which indicate a c…
The formation mechanisms, phase stability, impurity incorporation, and morphological characteristics of lead niobates obtained by molten salt synthesis were studied by X‐ray diffraction analysis, scanning electron microscopy, and energy dispersive analysis. Results indicate that PbO is the fastdissolving component of…
The surface tension of the liquid binary alloys Ni–Cu, Ni–Sn, Fe–Cu, Fe–Sn, and Fe–Cr have been measured by the levitated droplet method. The results for Ni–Cu have been compared to duplicate measurements using the sessile drop method. It was found that the surface tensions of liquid Ni and Fe decrease sharply with in…
Ferroelectric phenomena in solids have been studied for seventy years. The history of their research is divided into five periods which are briefly characterized. Materials basis known today is overviewed. Factors motivating ferroelectric research are discussed and present status of practical applications is shown. Fi…
All articles of this category Alkynes are converted in good yield to alkyl and/or aryl substituted fumaronitriles and maleonitriles, a rich source of precursors to soluble tetraazaporphyrins.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMatrix infrared spectra of the phosphorus sulfides PS, P2S and PS2Zofia Mielke, G. Dana Brabson, and Lester AndrewsCite this: J. Phys. Chem. 1991, 95, 1, 75–79Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 19…
In a previous report, the principal-component analysis (PCA) of a set of data including flash points and ten other flammability-related physicochemical properties of 50 organic compounds was performed to explore the number of significant structural factors affecting the flash point. Just two structural factors were fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContribution of hydrogen bonds to apparent molecular mobility in supercooled D-sorbitol and some polyolsMotosuke Naoki and Satoshi KatahiraCite this: J. Phys. Chem. 1991, 95, 1, 431–437Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Publ…
Long-term static autoclave corrosion tests were conducted on Zircaloy-4 tube specimens in water at 633 K. The material variables included in this investigation were: annealing parameter range 10-17 to 10-19 h (with Q/R = 40 000 K). fabrication history variation of early and late beta-quenching steps, and final heat tr…
Heteroepitaxial growth of BaTiO 3 films on SrTiO 3 single-crystal substrates was studied in Ba(OH) 2 solution under hydrothermal conditions above 450°C. The epitaxial relation, BaTiO 3 ( hkl )//SrTiO 3 ( hkl ), was confirmed for the films on (100), (110), (111) and (210) faces of the SrTiO 3 crystals. Morphology of th…
The benthic diatom assemblages of the Westerschelde-estuary were studied by means of multivariate analysis. Two main groups and eight subgroups were distinguished. The relation with salinity and sediment composition was investigated. A clear relation between grain size and the distribution of the assemblages was found.
We present a simple analytic solution for the condition of constructive interference for light transmitted through an interferometer incorporating three ideally transparent layers of arbitrary thickness and refractive index. We also consider the effect of adding two metallic coatings to the outer surfaces of the inter…
Mono- and binuclear Rh and Ir complexes are easily obtained by reaction of sapphyrins with [{RhCl(CO)2}2] and/or [IrCl(CO)2(py)]. In these binuclear complexes (e.g., 1), the two [M(CO)2] fragments are no different sides of the ruffled 22 π-electron ligands. Complex 1 catayzes the hydrogenation of cyclohexenes.
Iron exists in Fe 2+ and Fe 3+ states in CaO–P 2 O 5 –Fe 2 O 3 glasses and they impart characteristic optical absorption bands that allow analysis of relative proportion of the two species. This communication reports the redox states of glasses melted under air, argon, and oxygen atmospheres and relates them to the di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of tris[bis(trimethylsilyl)amino]aluminum with ammonia and pyrolysis studiesK. J. L. Paciorek, J. H. Nakahara, L. A. Hoferkamp, C. George, J. L. Flippen-Anderson, R. Gilardi, and Wayde R. SchmidtCite this: Chem. Mater. 1991, 3, 1, 82–87Publication Date (Print):Janu…
The local structure and crystallization of amorphous GeTe (a-GeTe) were examined by means of Ge K-edge EXAFS. In a-GeTe, both Ge-Ge and Ge-Te bonds were observed to exist in nearest neighbors of Ge. The average coordination number around Ge is 3.7, which is close to the tetrahedral structure. A random covalent network…
To take advantage of the beneficial properties of advanced ceramics, it is necessary that their friction coefficient be reduced to an acceptable value. One method for achieving this goal is incorporation of a solid lubricant phase in the ceramic matrix. In this study, ceramic-matrix composites were fabricated by drill…
A new sodium vanadyl(IV) orthophosphate NaVOPO 4 has been synthesized by solid-state and hydrothermal method and characterized by single-crystal X-ray diffraction and magnetic susceptibility. It crystallizes in the monoclinic space group P 2 1 / c with a = 6.524(1), b = 8.455(4), c = 7.119(1), β = 115.29(1)°, Z = 4, R…