Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Preparative electrolyses of triethylammonium heptanoate using different types of carbon as the anode material are reported. In protic solvents dodecane, the Kolbe dimer, is the major product at vitreous or baked carbon anodes, but the major products at a graphite anode are the three hexyl heptanoates. Large difference…
Phases and compositions obtained from the molten systems CsPbCl3–CsPbBr3 and CsPbClnBr3–n-CsSnClnBr3–n have been identified and compared with those from the CsSnCl3–CsSnBr3 system. X-Ray powder data are consistent with all of the products being single-phase solid solutions based on the perovskite lattice and in which…
The equilibrium phase diagram of the lithium‐tellurium phase system has been investigated. Eutectic points occur at 179.9°C and greater than 99.0 atomic per cent (a/o) lithium, 448.5°C and 35.7 a/o lithium, and 423.1°C and 10.5 a/o lithium. Two intermediate phases, and , are present having melting points of 1204.5° an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeats of fusion and heat capacities of lithium chloride-potassium chloride eutectic and potassium nitrateRobert P. ClarkCite this: J. Chem. Eng. Data 1973, 18, 1, 67–70Publication Date (Print):January 1, 1973Publication History Published online1 May 2002Published inissue 1 J…
Abstract The kinetics of polymerization of various isocyanides by nickel(II) compounds has been studied. The data suggest that reaction occurs by means of successive isocyanide insertions at a positive nickel centre.
Magnetic circular dichroism (m.c.d.) and absorption spectra of the hexacyanoferrate (III) ion have been measured in two host lattices at room and liquid-helium temperatures. Previous interprepations of the charge-transfer(c.t)bands have been confirmed and new assignments of the d-d transitions have been made. With the…
The polarized Raman spectra of large (1 cm × 1 cm diameter) single crystal specimens of proustite (Ag3AsS3) and pyrargyrite (Ag3SbS3) have been obtained The number of irreducible representations of the unit cell, C3μ6 factor group, was calculated and the nineteen fundamental Raman and infrared-active modes (K ≈ 0) wer…
The crystal growth of boron phosphide, BP, has been investigated using two approaches: ( i ) the addition of phosphorus to a boron‐nickel or boron‐copper melt, and ( ii ) the recrystallization of boron phosphide from a nickel phosphide or copper phosphide solution in a temperature gradient. To determine the optimum co…
Lamellar cystals of amylose V complexes were prepared from aqueous solutions of amylose by using various complexing agents. Electron diffraction studies of these crystals revealed that three modifications exist. Furthermore it was found that the chain molecules of amylose in these modifications possess the 61, 71 and…
Abstract The compound LaNi 5 absorbs nearly 6 atoms of hydrogen per formula unit at an equilibrium pressure of 2.5 at and room temperature. LaNi 5 exhibits a high rate of absorption and desorption of hydrogen and the heat of reaction is about 7.4 kcal/mol H 2 . The dependence of the equilibrium pressure in the two‐pha…
The protonation behaviour of four porphyrins, two corroles, and aza-aetioporphyrin I in toluene–acetic acid mixtures has been studied by visible spectrophotometry. The macrocycles exist in the monoprotonated form in glacial acetic acid. The acidities of the seven monocations are compared. N-methyl substituted porphyri…
Treatment of trans-octaethylchlorin (1) with one equivalent of thallium(III) trifluoroacetate affords the corresponding aquo-hydroxide chelate (2) after chromatography on deactivated alumina; with four equivalents of the reagent, the ring opened dihydrobiliverdin (4) is obtained. When zinc trans-octaethylchlorin is tr…
The effect of total carbon content on susceptibility of iron to stress corrosion cracking (SCC, on the depth of intergranular corrosion without stresses, anodic polarization curves, and the general corrosion rate was examined on decarburized Armco iron and its ferritic or martensitic alloys with carbon up to 1.4% in 5…
Abstract The morphological characteristics of poly(ethylene terephthalate) (PET) have been inferred from the selective chemical degradation of amorphous regions, including chain folds, and subsequent analysis of the molecular weight distribution of the reaction products. Bulk PET of known thermal and orientation histo…
The angles of tilt of the anion octahedra in NaNbO3 have been calculated from measurements of the intensities of very weak x-ray difference reflections. Their variation with temperature is shown and compared with values calculated directly from lattice parameter measurements. The Nb displacements have also been calcul…
The X-ray crystal structure analyses of bis-(L-methioninato)cadmium(II), bis-(L-asparaginato)cadmium-(II), triaquabis-(L-glutamato)dicadmium(II) hydrate, aqua-(glycyl-L-glutamato)cadmium(II) hydrate, dichlorobis-(glycylglycine)cadmium(II), and aquachloro(glycylgly-cinato)cadmium(II) are reported; the crystal structure…
Binary blends for two pairs of esters of cholesterol, the myristate plus acetate and the myristate plus the nonanoate have been characterized to determine the equilibrium phase conditions for the isotropic liquid, the cholesteric and smectic mesophases, and the stable crystals. The phase diagrams were determined using…
Abstract Using the method of a modified water‐retention value (LRV), the time dependence and final value of swelling of cellulose in various liquids are found to be determined by the cellulose structure as well as by molar volume and the solubility parameter δ H of the liquid, especially its hydrogen bonding part δ H…
The crystal structure of the title compound has been determined by three-dimensional single-crystal X-ray study from photographic data. Crystals are monoclinic, space group P21/m, with Z= 2 in a unit cell of dimensions a= 7·98, b= 8·10, c= 7·14 (all ±0·02)Å, β= 101·0 ± 0·5°. The structure is built of discrete As4S5 mo…
The sensitized and unsensitized yields of phosphorescence and photoisomerisation of 6-nitro-1′,3′,3′-trimethyl-2′,3′-dihydro-2H-benzo[b]pyran-2-spiro-2′-indole in poly(methyl methacrylate) have been measured at various temperatures. The intersystem crossing yield which equals the unsensitized phosphorescence yield div…