Materials Literature
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Abstract Several series of alkali (sodium and potassium) aluminophosphate glasses were prepared with compositions of 32–63 mol % of P2O5 and the properties of these glasses were determined. In the glasses with a higher P2O5 content (P2O5\gtrsim42.5 mol % in the Na2O–Al2O3–P2O5 glass and P2O5\gtrsim45 mol % in the K2O–…
ABSTRACT Navicula ulvacea (Berkeley ex Kütz.) P. T. Cleve, a marine colonial blade‐forming diatom originally discovered in Scotland was collected at North Rustico, Prince Edward Island, during winter 1971. It formed dense stands of Porphyra‐ like fronds, ranging up to 60 mm long × 20 mm wide. These occurred under ice‐…
The new compound K 5 CuSb 2 crystallizes in the space group R3̄m with the constants a = 591(2) pm, c = 2814(4) pm, c/a = 4.76. There are linear (Sb-Cu-Sb) 5- groups in the structure which are isoelectronic to the HgCl 2 molecule.
Abstract BaTeO 3 tritt in zwei Modifikationen auf. Einkristalle beider wurden aus Schmelzen von BaCO 3 mit TeO 2 präpariert und röntgenographisch untersucht. Für die schon bekannte monokline Form BaTeO 3 (I) wurde die reduzierte Zelle bestimmt: a = 463,3(4), b = 594,3(5), c = 710,4(5) pm, β = 106,4(1)°, Z = 2, Raumgru…
Abstract Commonly used thermal process calculations are based on temperature differences. An improved method of calculation based on sterilizing ratios is described. This method is independent of the temperature scales used, and reduces the number and size of associated tables. The integration limits were able to be s…
Abstract The temperature dependence of the luminescence spectra and of the emission lifetimes are measured in KBr:In + . From these results detailed information is obtained on the adiabatic potential energy surface of the relaxed excited state.
Ellipsometry has been used to follow the oxidation of the (111) face of a copper single crystal at 21 °C for oxygen pressures from 0.03–760 Torr. The pressure dependence is complex, with the short term oxide film thickness increasing to a limiting value as pressure increases, whereas the long term thickness goes throu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal tetrathiolenes. 4. Synthesis, characterization, and electrochemistry of new discrete diplatinum-tetrathiolene complexesBoon-Keng Teo and P. A. Snyder-RobinsonCite this: Inorg. Chem. 1979, 18, 6, 1490–1495Publication Date (Print):June 1, 1979Publication History Publishe…
The paper describes a very-low-frequency (VLF) high-voltage test facility and includes the results of partial-discharge (corona) measurements undertaken on samples of electrical machine insulation. The samples were energized by means of a high-voltage generator, capable of producing alternating Voltages from 0.1 Hz up…
After a brief survey of the mechanism of cellulose acid hydrolysis and the influence of the structure of cellulose on the reaction rate under heterogeneous conditions, thermohydrolysis, hydrolysis by dilute acid, and enzymatic degradation are compared with regard to the influence of the structure of cellulose. Cotton…
Abstract UV-visible light absorption spectra of dilute suspensions of standard and commercial montmorillonites (bentonites) and of nontronite, hectorite and pyrophyllite, were studied. All montmorillonites exhibit either an absorption band or a shoulder at a wavelength of 245 nm. The absorption peak for nontronite is…
Abstract From equilibrium silica concentrations over imogolite and boehmite at 100–155°C, the heat and free energy of the reaction (HO) 3 Al 2 O 3 SiOH + H 2 O ⇌ 2AlOOH + Si(OH) 4 have been obtained: Δ H ° r (298·15 K)=38·6 ± 4·1, Δ G ° r (298·15 K) = 26.8 ± 1·1 kJ mol −1 , and hence the heat and free energy of format…
Abstract Als erste Vertreter der Familien der Hexatellurodigermanate und der Hexatellurodistannate wurden K 6 [Ge 2 Te 6 ] und K 6 [Sn 2 Te 6 ] dargestellt und ihre Strukturen aufgeklärt. Für die Ge‐Verbindung wurde die Raumgruppe C 2/c gefunden mit den Gitterkonstanten a = 16,010(8) Å, b = 13,619(8) Å, c = 9,713(5) Å…
Abstract The addition of a 10% talc internal standard to North Pacific sediments allows the relative abundances of clay minerals to be determined both accurately and precisely by X-ray powder diffractometry. Linear programming can be used to generate factors for converting talc-normalized peak areas to weight percenta…
Abstract The molecular process involved in the plastic deformation of crystals of linear polyethylene and isotactic polystyrene by necking was investigated by transmission electron microscopy (TEM). The results for the draw ratio, the height, and the shape of the neck and the molecular structure of the deformed materi…
The chloride corrosion behavior of five silver-palladium dental casting alloys was investigated in a 1% NaCl solution through the use of electrochemical hysteresis technique. The corrosion mechanism has been interpreted in terms of the microstructure of these alloys and their possible electrochemical reactions.
High-purity iron single crystals of ·2 mm diameter with a residual resistivity ratio of ∼3500 have been produced by the strain-annealing method from a poly-crystalline rod purified by zone refining in hydrogen gas and in vacuo. These single crystals could be deformed at helium temperature up to several percent strain…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA manganese phthalocyanine-dioxygen molecular adductA. B. P. Lever, J. P. Wilshire, and S. K. QuanCite this: J. Am. Chem. Soc. 1979, 101, 13, 3668–3669Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://pubs…
Five new oxidpnictides have been prepared and structurally characterized. They crystallize in the tetragonal system, I4/mmm, with the following constants: Sr 2 Mn 3 As 2 O 2 : a = 416 ± 1 pm, c = 1884 ± 4 pm, c/a = 4.529, Ba 2 Mn 3 As 2 O 2 : a = 424.8 ± 0 5 pm, c = 1977 ± 3 pm, c/a = 4.654, Sr 2 Mn 3 Sb 2 O 2 : a = 4…
Abstract The hydroxyl orientations in 31 dioctahedral and trioctahedral 2:1 phyllosilicate structures have been determined by electrostatic energy calculations. These structures included micas, brittle micas, and other related minerals exhibiting ordered as well as disordered cation distributions. The dioctahedral mic…