Dielectric properties and X-T phase diagram of mixed K1−x(NH4)xH2PO4crystals
The x-T phase diagram of K1−x (NH4)xH2PO4 mixed crystals have been plotted on the base of results of dielectric measurements and literature data.
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Effects of Oxygen on the Properties of Sputtered Molybdenum Thin Films
The effects of oxygen on film structures and film stresses of sputtered Mo thin films have been investigated. Mo films (8000 Å) were deposited on Si(111) wafers in 0.4 Pa using Ar or Ar+O 2 (O 2 partial pressure: 0.01 Pa) working gases at 423 K. The major impurity was oxygen, and argon content was below the detection…
Luminescence thermal quenching of Cr 3 + in zirconium-barium-based fluoride glasses investigated by time-resolved laser spectroscopy
The optical properties of trivalent chromium ions in zirconium-barium-lanthanum fluoride glasses [${62\mathrm{Z}\mathrm{r}\mathrm{F}}_{4}$-${30\mathrm{B}\mathrm{a}\mathrm{F}}_{2}$-${8\mathrm{L}\mathrm{a}\mathrm{F}}_{3}$, ${57\mathrm{Z}\mathrm{r}\mathrm{F}}_{4}$-${34\mathrm{B}\mathrm{a}\mathrm{F}}_{2}$-${5\mathrm{L}\ma…
Oxygen Tracer Diffusion in Single‐Crystal Alumina
Oxygen tracer diffusion coefficients are determined in single‐crystal alumina samples; with differing dopant levels using the gas‐exchange technique. The diffusion direction is parallel to the c ‐axis and the ambient P o 2 is 1 atm (10 5 Pa) for all experiments except a single run with a low P o 2 The diffusion is ins…
Supersaturated Zincate Solutions: A Study of the Decomposition Kinetics
A kinetic study of the precipitation reaction from supersaturated zincate solutions is made by conductometric and nephelometric measurements and by complexometric titration of the zinc remaining in the solution. The precipitation occurs following a homogeneous and a heterogeneous reaction, the second one being catalyz…
Silica‐Based Oxide Systems: I . Experimental and Calculated Phase Equilibria in Silicon, Boron, Phosphorus, Germanium, and Arsenic Oxide Mixtures
Relations between the glass transition, the flow, and the liquidus temperatures were studied in order to determine compositions of silica‐rich oxide materials for planarization layers in very large scale integrated technology. Thus, the Si 1 / 2 O , B 2 / 3 O , P 2 / 5 O , Ge 1 / 2 O , and AS 2 / 3 O binary phase diag…
Absorption Spectra of Lanthanide Complexes in Solution
The 4f electrons of lanthanides yield three types of transitions: (i) Internal 4f-4f transitions which give rise to sharp, narrow bands of comparatively weak intensities which are Laporte forbidden. (ii) Allowed 4fn−4fn-1 (n – l)d, which are relatively broad and intense. (iii) Broad and often intense 4fn−λ−1 fn+1 elec…
Effective computational models for anisotropic soft B-H curves
The flux density B for a magnetic field H in a soft magnetic material is given by the derivatives of the stored coenergy density with respect to the components of H. Any single-valued nonlinear tensor permeability may therefore be stored compactly, and retrieved with little computation, by storing its coenergy density…
Optical properties of II-VI semiconductor nanocrystals
An empirical tight-binding framework and the recursion method are used to calculate some electronic properties of II-VI semiconductor nanocrystals. First, the ground-state energy of the exciton is calculated. Results are given for six different II-VI compounds. A simple evaluation of the optical absorption peak of the…
EFFECTS OF DOSING AND MIXING CONDITIONS ON POLYMER FLOCCULATION OF CONCENTRATED SUSPENSIONS
A simple monitoring technique has been used to derive information on Hoc growth and break-up in agitated clay suspensions of quite high solids content (1 and 3% w/v), under the influence of a high molecular weight cationic polymer. For fairly low polymer dosages and high mixing speeds floe growth in the 3% suspensions…
Silicon-29 MAS NMR investigation of the sodium oxide-alumina-silica glasses
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon-29 MAS NMR investigation of the sodium oxide-alumina-silica glassesHideki Maekawa, Takashi Maekawa, Katsuyuki Kawamura, and Toshio YokokawaCite this: J. Phys. Chem. 1991, 95, 18, 6822–6827Publication Date (Print):September 1, 1991Publication History Published online1…
Effects of shear on miscible polymer blends: in situ fluorescence studies
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of shear on miscible polymer blends: in situ fluorescence studiesS. Mani, M. F. Malone, Henning H. Winter, J. L. Halary, and L. MonnerieCite this: Macromolecules 1991, 24, 19, 5451–5458Publication Date (Print):September 1, 1991Publication History Published online1 Ma…
Thermal properties and stereoregularity of poly(3-hydroxybutyrate) prepared from optically active .beta.-butyrolactone with a zinc-based catalyst
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal properties and stereoregularity of poly(3-hydroxybutyrate) prepared from optically active .beta.-butyrolactone with a zinc-based catalystNaoki Tanahashi and Yoshiharu DoiCite this: Macromolecules 1991, 24, 20, 5732–5733Publication Date (Print):September 1, 1991Public…
Thermal Residual Stresses in Ceramic‐to‐Metal Brazed Joints
When a ceramic‐to‐metal brazed joint is fabricated, residual stresses develop as the material is cooled from the brazing temperature to room temperature. These residual stresses reduce the strength of the brazed joint, and in some cases lead to catastrophic failure at or near an interface, during the brazing process i…
Nematic and smectic order in a fluid of biaxial hard particles
The liquid-crystalline phase behavior of a fluid of biaxial hard particles (spheroplatelets) is studied using a scaled particle calculation of the fluid configurational entropy combined with a cell description of translational order. If translational ordering is ignored, the density versus particle biaxiality phase di…
New mesogenic 1,3,4-oxadiazole derivatives
The synthesis of novel liquid-crystalline heteroaromatic compounds incorporating the five membered 1,3,4-oxadiazole ring is described. Due to the bent molecular structure of the oxadiazole ring their mesophase stability is low if the heterocyclic ring occupies a central position, but it is increased if this ring is sh…
Aluminum(III) speciation with acetate and oxalate. A potentiometric and aluminum-27 NMR study
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAluminum(III) speciation with acetate and oxalate. A potentiometric and aluminum-27 NMR studyFabien Thomas, Armand Masion, Jean Yves Bottero, James Rouiller, Francine Genevrier, and Denis BoudotCite this: Environ. Sci. Technol. 1991, 25, 9, 1553–1559Publication Date (Print):…
Potassium Fixation and Charge Characteristics of Soil Clays
Abstract Forty‐four soil clays and four reference phyllosilicate clays were used to establish qualitative and quantitative relationships between clay mineral characteristics and K fixation. The soil clays were obtained from Vertisols, Vertic Mollisols, Haploxerolls, Xerochrepts, and a Palexeralf, from three semiarid r…
Hydrothermal synthesis and structural characteristics of two layered mixed-valence vanadyl phosphate hydrates Na0.50VOPO4.2.0.H2O and K0.50VOPO4.1.5.H2O
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal synthesis and structural characteristics of two layered mixed-valence vanadyl phosphate hydrates Na0.50VOPO4.2.0.H2O and K0.50VOPO4.1.5.H2OS. L. Wang, H. Y. Kang, C. Y. Cheng, and K. H. LiiCite this: Inorg. Chem. 1991, 30, 18, 3496–3499Publication Date (Print):S…
Measurement of Fabric Drape and Its Relation to Fabric Mechanical Properties and Subjective Evaluation
Fabric drape of a number of fabrics was measured using a digital Drape Tester and was found to be significantly correlated with the subjective evaluation of drape. Fabrics were draped on two different-sized pedestal plates, and differences in draping behavior between plates and among fabrics were determined Composite…