Materials Literature
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The mean escape depths of Si 1s, Si 2p, and O 1s photoelectrons from silicon−silicon dioxide structures were determined over a wide kinetic−energy range with magnesium, aluminum, and chromium x−ray sources. Variations in photoelectron line intensity were measured as a function of oxide film thickness. Film thicknesses…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProduction of Crystalline Pyrophosphoric Acid and Its SaltsChung Y. ShenCite this: Ind. Eng. Chem. Process Des. Dev. 1975, 14, 1, 80–85Publication Date (Print):January 1, 1975Publication History Published online1 May 2002Published inissue 1 January 1975https://pubs.acs.org/d…
Des amphiboles orthorhombiques participent fréquemment aux paragenèses des amphibolites à sapphirine des Pyrénées. Leur composition, remarquablement alumino-magnésienne, permet d'élargir le domaine de composition actuellement connu pour ces minéraux. Un des échantillons représente le terme naturel le plus proche, actu…
Three different salts of the [AuBr4]– ion display the resonance Raman effect when irradiated in the solid state with any one of several different exciting lines (frequency νo). For 457·9 nm excitation, which approximately coincides in frequency with that of an intense electronic band maximum (νe) of the anion, the res…
The 4,5-epidioxide of 2,4,5-triphenyl-1-(2,4,5-triphenyl-2H-imidazol-2-yl)imidazole is obtained by methylene blue sensitised photo-oxidation at –50 °C; it undergoes isomerisation, reduction, and degradation reactions, leading inter alia to 2-benzoyl-1,2-dihydro-2,4,6-triphenyl-1,3,5-triazine and 1,3a,4(6),6a-tetrahydr…
Abstract The crystal structure of a metal free corrin hydrochloride synthesised by Eschenmoser & Fischli has been found by X‐ray analysis. The crystals are monoclinic and contain ethanol of crystallisation; a = 10.84 Å, b = 12.04 Å, c = 26.04 Å, γ = 120.4 in space group P2 1 /a. The structure was determined by dir…
In this account 34 species of plankton diatoms identified from the collections made during the cruises of R. V. Varuna and from thf collections of Cochin Backwater are described. Except one species, others are new distributional records from the Indian Seas. A brief remark on the distributional records of some of thes…
Mössbauer spectra of 13 four-co-ordinate, formally IrI, species are reported. The comparatively small differences in the electronic environments of the iridium nuclei in these complexes are attributed to the interaction between the metal–ligand bonds in these molecules leading to compensation effects. This interpretat…
Abstract Iron(III) complexes with several tetradentate Schiff Bases [FeLXY]n+ and [Fe salen CN] were synthesized, where L is a tetradentate Schiff Base including salen = NN′-ethylenebis(salicylideneiminate), X and Y represent imidazole and cyanide ion. Magnetic susceptibilities and ESR spectra were measured for these…
Abstract Random copolymers of styrene and methyl methacrylate, prepared by free radical polymerization in bulk at 60°C, were irradiated under vacuum at 35°C with 60Co gamma rays to doses up to 200 Mrad. The flexural strength, with failure occurring in all cases by brittle fracture, decreased with radiation dose; the r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow level .gamma.-ray spectrometry. Thallium-doped sodium iodide vs. lithium-doped germaniumRobert. Robertson, Nicholas M. Spyrou, and Terence J. KennettCite this: Anal. Chem. 1975, 47, 1, 65–70Publication Date (Print):January 1, 1975Publication History Published online1 May…
I.r. spectra of [Ni(15NH3)6]Cl2 and [Co(15NH3)6]Cl3 and Raman and i.r. spectra of [Zn(15NH3)4]I2 are reported and compared with the spectra of the normal ammines. The 14N–15N isotope shifts can be used to solve some assignment problems. Reliable skeletal force constants have been calculated by use of the nitrogen isot…
1. The overall kinetic constants of the reversible anomerisation of d-glucopyranose 6-phosphate from alpha to beta non-enzymatically as well as catalysed by glucose-6-phosphate 1-epimerase are determined by application of a novel computerized non-linear optimization technique. 2. The non-enzymic rate constants for the…
Abstract On the example of the Ne glow discharge with a benzol admixture the possibility of applicating the probe diagnostic in polymerizing plasmas is investigated. Heating the probe at 900°C stetady values for the floating potential, the probe characteristic and its second derivation are obtained. The variation with…
Attempts to resolve differences in the literature concerning the structures and magnetic properties of the compounds BaNiO2 and BaNiO3 are reported. BaNiO2 has the properties of an octahedral nickel(II) compound (SrNiO2 cannot be obtained free from NiO). Nickel(III) systems, A2NiO4(A = La, Al, or Ga), have also been p…
This paper discusses current important problems involved in using commercial ferritic stainless steels. These problems are intergranular attack due to sensitization, embrittlement of the alloy in certain temperature ranges, control of the carbon and nitrogen contents, and carbide stability. Several areas in which futu…
Abstract Active carbon was oxidised in several oxidising solutions and measured for its surface acidity, specific surface area, X‐ray diffraction patterns, ESR spectra and gas adsorption isotherms. The favourable oxidising conditions for acidifying active carbon were speculated. Three kinds of steam activated coconut‐…
The effect of Au nucleation sites, deposition rates, and the film thickness on the crystallinity and electronic properties of evaporated Te films has been investigated. It has been found that to obtain large−grain Te films there exists an optimum conditoin in the coating ratio of Au nucleation sites and the film thick…
Changes of three‐layer clay minerals by native K in holocene loess derived soils of Central Germany and Lower Bavaria . Transformations of the clay minerals illite, vermiculite and smectite were determined in Central German (31 profiles) and Lower Bavarian loess districts (5 profiles) using 31–36 soil properties. To g…
Abstract The colour changes of YAG crystals doped with Ti, V, Cr, Mn, Fe, Co and Ni as well as those doped with Mg or Be are described. The comparison of samples annealed in hydrogen oxygen and argon and exposed to an UV irradiation is given. Yellow or brown colour of YAG crystals is attributed to the O − centre forma…