Materials Literature
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The temperature dependence of the refractive index n of cubic crystals undergoing phase transitions (PT) is measured with an accuracy of the order δn=10−6 at temperatures between 3.5 and 1000 K with a computer-controlled Jamin–Lebedeff interferometer. Microscopic monitoring for in situ sample orientation and single do…
Dose rates have been measured at 0.1 m, 0.5 m and 1.0 m from patients in a Nuclear Medicine Department. Data are presented for a variety of Nuclear Medicine procedures using doses of radiopharmaceuticals within the recommendations of the administration of Radioactive Substances Advisory Committee (ARSAC). The correspo…
The polarized Raman spectra of rare‐earth fluoride glasses based on BaF 2 and ThF 4 , in combination with ZnF 2 , YF 3 , YbF 3 , LuF 3 , andlor AlF 3 , are reported and compared with those of other heavy‐metal fluoride glasses. The spectra of rare‐earth fluoride glasses, especially those containing large amounts of Al…
The following new compounds have been prepared and structurally characterized: Na 4 Si 4 Se 10 : orthorhombic, space group Cmcm (No. 63). a = 1340.9(5) pm, b = 1318.4(5) pm, c = 1086.5(4) pm, Z = 4. ρ x = 3.44 g/cm 3 , ρ exp = 3.47 g/cm 3 . The compound crystallizes in the Na 4 Si 4 S 10 type with adamantane analogous…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond studies of ruthenium(II) and ruthenium(III) porphyrin photophysicsC. Drew Tait, Dewey Holten, Mark Barley, David Dolphin, and Brian R. JamesCite this: J. Am. Chem. Soc. 1985, 107, 7, 1930–1934Publication Date (Print):April 1, 1985Publication History Published onli…
We report here the first electrochemical data on substituted silane high polymer films deposited on a Pt electrode. The oxidation peak potentials were measured for a series of substituted silane high polymers. The polymers oxidize irreversibly and produce soluble products which are removed from the electrode. The ease…
Abstract Stress relaxation was studied in torsion under superposed hydrostatic pressure using a newly constructed device. Two materials, a styrene–butadiene rubber and a butadiene rubber, were studied in the range from −60 to 30°C at pressures up to 500 MPa. The time–temperature–pressure superposition of the data can…
Abstract Spectroscopic properties of undoped YAG and YAP grown under reducing protective atmosphere were compared. Blue (with F centre) or brown (with 0 − centre) varieties both of the materials were prepared in the dependence of the Al 2 O 3 :Y 2 O 3 ratio in the melt. Colour intensity depends on the H 2 O:H 2 ratio…
The high‐temperature reactions occurring between an a‐Sic and a basic coal slag were examined. The resulting corrosion behavior was found to involve at least three mechanisms, including passivation of the Sic via SiO 2 formation, dissolution of the SiO 2 by the coal slag, and formation of a localized Fe‐Ni silicide. T…
Barium titanate ceramics with high degrees of c‐axis orientation were fabricated from fibrous particles. The maximum piezoelectric constant, d 33 , obtained was ≅270 pC/N, which is much higher than values reported previously.
Abstract Catalytic oxidation of CO on alumina‐supported platinum was studied in a tubular isothermal reactor with applied concentration transients. A completely automated reactor system capable of switching frequencies as high as 0.2 Hz was constructed. Concentration cycling resulted in reaction rates that were much h…
Spin-lattice relaxation times, viscosities, and densities have been measured as a function of temperature and pressure for several supercooled viscous fluids in order to investigate the adequacy of the modified Debye equation to describe the microscopic behavior of these systems. By supercooling the range of experimen…
A Coulter Counter, Model TAII was used to determine both solubility and dissolution rate from suspensions of griseofulvin and hydrocortisone acetate, where the initial particle size and shape had been characterized. The method assesses the weights and surface areas of particles remaining undissolved as a function of t…
Abstract Melt strength (MS) and breaking stretching ratio (BSR) data relative to polyethylenes with different molecular structure (high density (HDPE), low density (LDPE), and linear low density (LLDPE)) are shown. HDPE and LLDPE samples show high breaking stretching ratio and low melt strength values. The LDPE sample…
The phase equilibria in the zirconia‐rich part of the system ZrO 2 −Yb 2 O 3 −Y 2 O 3 were determined at 1200°, 1400°, and 1650°C. The stabilizing effects of Yb 2 O 3 and Y 2 O 3 were found to be quite similar with <10 mol% of either being necessary to fully stabilize the cubic fluorite‐structure phase at 1200°C. T…
The paper reports the low temperature behavior of a linear chain formed by Copper ion and organic radicals. The analysis of magnetic data down to 0.08 K allows to determine the nature and intensity of the exchange interactions between the Cu ion and the Tempol radical and the intra chain antiferromagnetic interaction.
Abstract Als eine der neueren Entwicklungen auf dem Gebiet der homogenen Katalyse gelten Katalysatoren, die die Umsetzung von 1‐Alkenen zu Alkenyllithium‐Verbindungen und Lithiumhydrid sowie die Hydrierung von Lithium und Magnesium unter milden Bedingungen ermöglichen. Katalytisch erzeugtes Magnesiumhydrid ist hochrea…
Abstract A kinetic study of the graft copolymerization of methyl methacrylate onto jute fiber using KMnO 4 –malonic acid redox initiator system has been made. Effects of the concentrations of malonic acid, monomer, and KMnO 4 on graft yield have been studied. Besides, the effects of temperature, acid, and reaction med…
The applicability of the structural unit model, developed for tilt boundaries by Sutton and Vitek (1983), to (001) twist boundaries in f.c.c. metals is investigated. The model is found to be useful in discussing the continuity of boundary structure with misorientation and the Burgers vectors of screw grain boundary di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic compounds of the lanthanides. 24. Synthesis and x-ray crystallographic characterization of the first organolanthanide derivative with a lanthanide-silicon bondHerbert. Schumann, Siegbert. Nickel, Ekkehardt. Hahn, and Mary J. HeegCite this: Organometallics 1985…