Jean‐Marc Giraudon、Dominique Mandon、J. Sala‐Pala 等 7 位作者1990-02-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolybdenum and tungsten complexes with unusual coordination modes of a dibenzotetraaza[14]annulene ligand. From bidentate to tridentate scorpiand coordination by reaction with acetonitrile and from bidentate to tetradentate coordination via electrochemistryJean Marc Giraudon…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistrySurface Chemistry and Catalysis
M. C. van dor Leeden、G.M. van Rosmalen1990-02-01SPE Production Engineering
Summary To establish a relationship between the molecular structure of polycarboxylates and their growth-retarding influence on barium sulfate, seeded-suspension-growth experiments were performed at various inhibitor concentrations and pH values. Two types of polycarboxylates with a molecular structure based on either…
Calcium Carbonate Crystallization and InhibitionLayered Double Hydroxides Synthesis and ApplicationsElectrophoretic Deposition in Materials Science
M. Haddad、P. Becker1990-02-01Acta Crystallographica Section A Foundations of Crystallography
The extinction factor in finite perfect crystals is calculated from pure dynamical theory. In particular, a detailed solution is proposed for a sphere, in which case the extinction factor depends on the Bragg angle θ and the parameter ( R / Λ ), where R is the radius of the crystal and Λ the extinction length. An appr…
Liquid Crystal Research AdvancementsPhotonic Crystals and ApplicationsX-ray Diffraction in Crystallography
Joel W. Ager、Douglas Veirs、Gerd M. Rosenblatt1990-02-01The Journal of Chemical Physics
Large oscillations in the vibrational Raman intensity have been observed for thin films adsorbed on a metal substrate as a function of film thickness. The systems studied, N2 and O2 physisorbed on Ag(111) at 14±1 K, have previously been shown to be unenhanced, i.e., the observations are not caused by the surface enhan…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesRandom lasers and scattering media
G. Cipparrone、Cesare Umeton、G. Arabia 等 5 位作者1990-02-01Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics
We report the observation of optical nonlinearities induced by thermal effects in polymer dispersed liquid crystals. Experimental data about optical switching of a low power laser beam are presented and discussed
Liquid Crystal Research AdvancementsPhotochemistry and Electron Transfer StudiesNonlinear Optical Materials Studies
A. M. Bruce、E. B. Pike、W. J. FISHER1990-02-01Water and Environment Journal
ABSTRACT New UK regulations from June 1989 will enforce the provisions of an EC Directive on the use of sewage sludge in agriculture. Among the requirements is one that sludge should be treated before surface application to farmland. Treatment is needed to reduce ‘significantly’ both the fermentability of sludge and t…
Metallurgy and Material Science
Jenn‐Ming Wu、Chi‐Jen Chen1990-02-01Journal of the American Ceramic Society
The effect of powder characteristics on the microstructures and dieletric properties of (Ba,Nb)‐doped TiO 2 ceramics was investigated. Two powders were prepared: one by coprecipitation and the other from mixing of reagent oxides. The powder characteristics were determined by TEM, X‐ray powder diffraction, SEM, and cen…
Multiferroics and related materialsMagnetic Properties and Synthesis of FerritesMicrowave Dielectric Ceramics Synthesis
V. Patrick、George R. Gavalas1990-02-01Journal of the American Ceramic Society
Mixed oxides of copper and aluminum were prepared in porous form by the citrate process under various calcination conditions. The oxide samples were characterized by several techniques to determine chemical structure and texture. Atomic absorption spectroscopy provided the fractions of copper soluble and insoluble in…
ZnO doping and propertiesCatalytic Processes in Materials ScienceIndustrial Gas Emission Control
Richard A. O’Brien、Reuben D. Rieke1990-02-01The Journal of Organic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect metalation of p-bromopolystyrene using highly reactive copper and the preparation and reaction of highly reactive copper bound to an insoluble polymerRichard A. O'Brien and Reuben D. RiekeCite this: J. Org. Chem. 1990, 55, 3, 788–790Publication Date (Print):February 1…
Organometallic Complex Synthesis and CatalysisSynthesis and properties of polymers
S. Y. Lee、M. J. McNallan1990-02-01Journal of The Electrochemical Society
The oxidation of iron in gas mixtures consisting of Ar, , and at 1100 and 1200 K has been investigated by thermogravimetric analysis and examination of the corrosion products of the process by scanning electron microscopy and x‐ray diffraction analysis. The results of the experiments have been compared with theoretica…
High-Temperature Coating BehaviorsThermal and Kinetic AnalysisIndustrial Gas Emission Control
Yoshio Manabe、Tsuneo Mitsuyu1990-02-01Japanese Journal of Applied Physics
Zinc oxide (ZnO) thin films have been prepared by a sputtering deposition utilizing electron-cyclotron-resonance (ECR) plasma. An X-ray diffraction analysis indicated that the ZnO films were highly c -axis oriented. The electrical resistivity of ZnO films is as high as 2.5 MΩcm. It is confirmed that the ZnO films exhi…
ZnO doping and propertiesGas Sensing Nanomaterials and SensorsAcoustic Wave Resonator Technologies
Ning Wang、K. H. Kuo1990-02-01Philosophical Magazine Letters
A series of electron diffraction patterns displaying continuous transformation of the octagonal quasicrystal into the β-Mn type structure were obtained in a rapidly quenched Cr-Ni-Si alloy. This transformation is interpreted in terms of a gradual introduction of short-range periodical translational order to the octago…
Microstructure and mechanical propertiesIntermetallics and Advanced Alloy PropertiesQuasicrystal Structures and Properties
I. Mrozek、A. Otto1990-02-01Europhysics Letters (EPL)
A clean silver island film prepared in UHV was covered at about 28 K first with one monolayer of C 5 D 5 N and afterwards exposed to a quantity of C 5 H 5 N corresponding to 4 monolayers (or vice versa ). Raman scattering showed an intensity enhancement of about 2 orders of magnitude confined to the isotopic species a…
Gold and Silver Nanoparticles Synthesis and ApplicationsCopper-based nanomaterials and applicationsNanocluster Synthesis and Applications
E. J. O’Sullivan、L.D. Burke1990-02-01Journal of The Electrochemical Society
The activity of rhodium for oxygen gas evolution in base is significantly enhanced by the presence of a thick, hydrous oxide film which is produced by repetitive potential cycling. An increase in oxygen evolution rate of up to three orders of magnitude was obtained on growing these films; the latter were found to be s…
Electrocatalysts for Energy ConversionSemiconductor materials and devicesElectronic and Structural Properties of Oxides
L.M. Toth、L. K. Felker1990-02-01Radiation effects and defects in solids
Fluoride salt mixtures of composition, LiF–BeF2–ZrF4–UF4 (64.5, 30.3, 5.0, 0.13 mol%) were irradiated using 107–108 R/h gamma radiation to achieve high doses. Under these conditions, F2 is released from the salt and accumulates as an F2 overpressure until a 2 mol% damage limit in the crystal is reached. At this point,…
Luminescence Properties of Advanced MaterialsNuclear Materials and PropertiesNuclear materials and radiation effects
G. F. Bastin、H. J. M. Heijligers1990-02-01Materialwissenschaft und Werkstofftechnik
No abstract.
Electron and X-Ray Spectroscopy TechniquesSurface and Thin Film PhenomenaAdvanced Materials Characterization Techniques
Éric G. Derouane、J. G. Fripiat、Roland von Ballmoos1990-02-01The Journal of Physical Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum mechanical calculations on molecular sieves. 2. Model cluster investigation of silicoaluminophosphatesEric G. Derouane, J. G. Fripiat, and R. Von BallmoosCite this: J. Phys. Chem. 1990, 94, 4, 1687–1692Publication Date (Print):February 1, 1990Publication History Publ…
Mesoporous Materials and CatalysisCrystal Structures and PropertiesClay minerals and soil interactions
W. J. Meng、J. Faber、P.R. Okamoto 等 6 位作者1990-02-01Journal of Applied Physics
Hydrogen-induced phase transformations of the equilibrium intermetallic compound Zr3 Al have been studied by in situ elastic neutron scattering, x-ray diffraction, and transmission electron microscopy (TEM). TEM observations reveal two distinct modes of amorphous phase formation in Zr3 Al upon hydrogenation, namely, h…
Magnesium Alloys: Properties and ApplicationsHydrogen Storage and MaterialsIntermetallics and Advanced Alloy Properties
P. X. Zhang、Yurui Fang、W. N. Wang 等 5 位作者1990-02-01Journal of Raman Spectroscopy
Abstract The influence on silver colloids of the addition of KCI was directly investigated by means of transmission electron microscopy (TEM). It was found that the particle size increased and the surfaces of the crystal particles of the silver became covered with an overlayer. Additionally, the pattern of aggregation…
Gold and Silver Nanoparticles Synthesis and ApplicationsIron oxide chemistry and applicationsCopper-based nanomaterials and applications
Tetsuaki Nishida、Hiroshi Ide、Yoshimasa Takashima1990-02-01Bulletin of the Chemical Society of Japan
Abstract The isomer shift in the 57Fe-Mössbauer spectra of xCaO·(90−x)Ga2O3·10Fe2O3 (x=40–60) and xBaO ·(90−x)Ga2O3·10Fe2O3(x=65–70) glasses decreases gradually from 0.28 to 0.16 mm s−1 with increasing CaO or BaO contents. This indicates a formation of nonbridging oxygen atoms in the GaO4 and FeO4 tetrahedra. Large qu…
Glass properties and applicationsPhase-change materials and chalcogenidesPigment Synthesis and Properties