Bonshtedtite, Na3Fe(PO4)(CO3) — a new mineral
(1983). Bonshtedtite, Na3Fe(PO4)(CO3) — a new mineral. International Geology Review: Vol. 25, No. 3, pp. 368-372.
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I. Order–disorder transitions and solid state reaction kinetics in Na2SO4–K2SO4 system
The physicochemical aspects of the order–disorder phase transitions occurring in the Na 2 SO 4 –K 2 SO 4 system were investigated by thermal analyses, infrared absorption, and X-ray diffraction methods.Kinetic and structural studies on the compounds KNaSO 4 and K 3 Na(SO 4 ) 2 are reported in more detail.
Refractive Index of the Dispersed Phase in Oil‐in‐Water Emulsions: Its Dependence on Droplet Size and Aging
ABSTRACT A simple method of determining the refractive index of the dispersed phase was applied on different gum‐stabilized oil‐in‐water emulsions, in which this refractive index is taken to be equal to that of the continuous phase at (extrapolated) zero optical density point. Refractive indices of dispersed phases we…
c. Some electrochemical and photoelectrochemical properties of 3-Amino-7-dimethylamino-2-methylphenazine (Neutral Red) in aqueous solution
Neutral Red has been shown to undergo electrochemical and photoelectrochemical reactions in aqueous solution. At a pH above the pK,, the dye was oxidized with the loss of one proton with each electron. Similarly the protonated dye was oxidized at pH values below the pK,. Over the pH range examined, 1.0-9.2, Neutral Re…
Effect of Hot‐Pressing Temperature on the Thermal Diffusivity/Conductivity of SiC/AlN Composites
Data are presented for the thermal diffusivity/conductivity of hot‐pressed mixtures of SiC and AlN. Results indicate that hot‐pressing at higher temperatures, which permits solid‐solution formation, results in significantly lower thermal diffusivity/conductivity than is obtained by hot‐pressing at lower temperatures,…
Plasticizer migration from plasticized poly(vinyl chloride) into liquids. Effect of several parameters on the transfer
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlasticizer migration from plasticized poly(vinyl chloride) into liquids. Effect of several parameters on the transferDjelloul Messadi, Jean Louis Taverdet, and Jean Maurice VergnaudCite this: Ind. Eng. Chem. Prod. Res. Dev. 1983, 22, 1, 142–146Publication Date (Print):March…
DIATOM MINERALIZATION OF SILICIC ACID. VI. THE EFFECTS OF MICROTUBULE INHIBITORS ON SILICIC ACID METABOLISM IN NAVICULA SAPROPHILA1
ABSTRACT The role of microtubules in silicon metabolism leading to valve formation was investigated in the pennate diatom Navicula saprophila Lange‐Bertalot & Bonik. By using synchronized cells blocked after mitosis and cytokinesis but prior to cell wall formation, effects due to inhibition of mitosis were elimina…
Diffusion‐Controlled Redox Kinetics in a Glassmelt
A diffusion model was developed to analyze the rate at which Fe 2+ /Fe 3+ equilibration occurs in a Ca‐Al‐borosilicate melt in an air atmosphere at 1260°C. The resulting diffusion coefficient of oxygen determined from the model of 3.7 × 10 −7 cm 2 /s is in agreement with the range of values reported for other glass‐me…
Exchange coupling in triplet ground state dimeric molecules with specific reference to bis(.mu.-pyridine N-oxide)bis[bis(nitrato)(pyridine N-oxide)copper(II)] and bis(diethyldithiocarbamato)copper(II)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange coupling in triplet ground state dimeric molecules with specific reference to bis(.mu.-pyridine N-oxide)bis[bis(nitrato)(pyridine N-oxide)copper(II)] and bis(diethyldithiocarbamato)copper(II)William E. HatfieldCite this: Inorg. Chem. 1983, 22, 5, 833–837Publication…
Relationships between chemical, physical and mineralogical characteristics of the Rupelian Boom Clay, Belgium
Abstract The Boom Clay is an important raw material for the Belgian structural clay products industry. It can be divided into several lithological sub-units. In order to obtain an insight in the parameters which characterize these different units, and which affect the overall properties of the clay, a detailed chemica…
Light Propagation in Williams Domains as Analyzed Numerically by Geometrical Optics
We have studied Williams Domain (WD) patterns in detail by observing tomograms with a polarizing optical microscope, confirming the following characteristic features: (1) there are two types of real images, upper and lower; (2) the spacings between the neighboring imaginary image lines are not uniform; and (3) when th…
Effect of polymer chain tacticity on the fluorescence of molecular rotors
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of polymer chain tacticity on the fluorescence of molecular rotorsRafik O. Loutfy and David M. TeegardenCite this: Macromolecules 1983, 16, 3, 452–456Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1 March 1983http…
Weak-beam study of glide dislocations in h.c.p. cobalt
The weak-beam method of electron microscopy has been used to analyse the Shockley partial dislocations in a pure h.c.p. metal. Single crystals of cobalt were grown oriented for basal slip and deformed in compression. The dissociation of the basal glide dislocations into partials is resolved; tho arrangement of the mag…
Temperature dependence of the excited- state absorption of alexandrite
The temperature dependence from 28 to 290°C of the excited-state absorption cross section\sigma_{2a}(E)in the gain wavelength region of alexandrite has been determined from the temperature dependence of the single pass gain (SPG) and of the fluorescence.\sigma_{2a}(E)and the emission cross section increase with temper…
Thermal aging study of carboxyl‐terminated polybutadiene and poly(butadiene‐acrylonitrile)‐reactive liquid polymers
Abstract A thermal aging study of carboxyl‐terminated polybutadiene (CTB) and poly(butadiene‐acrylonitrile) (CTBN) reactive liquid polymers has been conducted at 50°, 75°, 100°, and 125°C. All CTB and CTBNs are stable at 50°C aging. On aging at higher temperatures prior to use, viscosities of CTB and CTBNs increase, a…
Magnesium chloride‐supported, high‐mileage catalysts for olefin polymerization. V. BET, porosimetry, and x‐ray diffraction studies
Abstract The physical state of the material obtained during the various stages of preparation of a typical MgCl 2 ‐supported, high‐mileage propylene polymerization catalyst was studied by BET, mercury porosimetry, and x‐ray diffraction techniques. The starting MgCl 2 and the substance after HCl treatment have negligib…
New optical recording material for video disc system
The optical characteristics of Sb2Se3 and Sb2Te3 films are changed due to an amorphous-crystalline phase transition below 200 °C. The respective reflectivity of 400 Å Sb2Se3 and 300 Å Sb2Te3 films, each on a Te reflective layer, is increased from 10% to 30% and from 45% to 65% by laser radiation. Using these new mater…
Mixing of states and the determination of ligand field parameters for high-spin octahedral complexes of nickel(II). Electronic spectrum and structure of bis(1,7-diaza-4-thiaheptane)nickel(II) perchlorate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixing of states and the determination of ligand field parameters for high-spin octahedral complexes of nickel(II). Electronic spectrum and structure of bis(1,7-diaza-4-thiaheptane)nickel(II) perchlorateSusan M. Hart, Jan C. A. Boeyens, and Robert D. HancockCite this: Inorg.…
Emission spectroscopic properties of dioxorhenium(V) complexes in crystals and solutions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEmission spectroscopic properties of dioxorhenium(V) complexes in crystals and solutionsJay R. Winkler and Harry B. GrayCite this: J. Am. Chem. Soc. 1983, 105, 5, 1373–1374Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1…
Effect of Thermal History on the Properties of a Willemite Glass‐Ceramic
The effect of time and temperature on the properties and structure of a willemite glass‐ceramic were measured. ‐0 polymorphs of willemite were found to exist in most of the glass‐ceramics. Those properties of the glass‐ceramic which depend primarily on the composition of the glassy phase (helium permeation and diffusi…