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。
X-Ray structural data for the bis-azobenzene-nickel(II) complexes (I) and (II) show that the donor atom X influences the size of the metallocycle and the bonding arrangement around nickel; in (I)(X = S) the metallocycle is five-membered, whereas in (II)(X = O) it is six-membered.
The crystal structure and phase transformation of the vanadium-oxygen alloys with O/V<0.28 were studied by combined methods of transmission electron microscopy, selected-area electron diffraction, X-ray powder diffraction and calorimetry. The interstitial oxygen atoms in the structure of V12O–V8O, which is usually ter…
Abstract The precipitation of basic nickel carbonate hydrates was studied from nickel sulphate solutions (concentrations 0.05 M to 1 M) at 96°C, by addition of sodium carbonate, bicarbonate‐carbonate and bicarbonate solutions. Precipitate compositions were determined by chemical analysis, thermogravimetric analysis, d…
The paper gives a brief description of the variation of insulation-surface conductance under artificial rain from dry conditions until steady-state wetting is achieved. The effect of wetting on insulator voltage distribution is examined. Wet flashover tests with alternating voltage and switching impulses of both polar…
Abstract A simple analytical form of induced anisotropy of heat conductivity k ij (λ 1 ,λ 2 λ 3 , T ) of initially isotropic polymer solids results from employing the simplified theory of the three‐chain model of the non‐Gaussian network. The analytical form appears to be valid up to a stretch ratio of λ = 2.65, which…
This paper presents the far-infrared spectrum and X-ray powder diffraction pattern of the structure I hydrate of cyclopropane at 100 °K, and the powder diffraction pattern of the isostructural ethylene oxide hydrate at 100 °K. Between 360 and 100 cm −1 the absorption by cyclopropane hydrate is essentially identical to…
This study of the Cu–Sm phase diagram has established that there are two congruent phases, CU6Sm and CU2Sm and three peritectic phases, CU5Sm, CU4Sm and CuSm. Eutectic reactions occur at 9 at.-% Sm:882° C, 28 at.-% Sm: 818° C, and 71 at.% Sm:597° C.
Le phosphate de terbium a été étudié par diffraction des rayons X entre 2,6 K et 295 K, par mesure de sa suscéptibilité magnétique et par diffraction neutronique à 1,5 K, 4,2 K et 300 K. Les paramètres du réseau quadratique sont : [FORMULE]. Les paramètres des oxygènes sont : [FORMULE](description non centro-symétriqu…
The crystal structure of the zeolite stellerite has been studied by X-ray methods : space group Fmmm with a = 13.599, b = 18.222, c = 17.863 (Å). The framework of stellerite is topologically the same as stilbite ; its content of exchangeable cations allows the highest symmetry compatible with the framework. An explana…
Infra-red and Raman spectra of fluoranil are presented for the first time. A complete assignment of intramolecular fundamentals is achieved mainly on the basis of oriented crystal and vapour spectra in infra-red and of solutions in Raman spectroscopy. A simplified Valence Force Field is used to repodurce the in-plane…
The compound Pb 3 P 2 O 8 has a low temperature monoclinic phase with space group C2/c and a high temperature phase with space group [Formula: see text], both with two crystallographically inequivalent cationic sites. X-ray data taken at five temperatures have indicated that an F-centered monoclinic cell is developed…
The clustering of iron atoms in a copper matrix, as determined by earlier Mossbauer effect studies on alloys containing up to 3.1 at.% Fe, has been analysed in terms of the atomic short range order parameter alpha 1 . Good agreement is found between the experimental and calculated values of the clustering in groups of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Molecular Weight Anthracene Containing PolymerMilan ŠtolkaCite this: Macromolecules 1975, 8, 1, 8–9Publication Date (Print):January 1, 1975Publication History Published online1 May 2002Published inissue 1 January 1975https://pubs.acs.org/doi/10.1021/ma60043a002https://d…
In the absence of radiation the corrosion of quenched, cold worked and aged Zr-2.5 Wt% Nb in 280 C (536 F) pressurized water decreases with increasing aging time and temperature. Under neutron irradiation the corrosion in all aged conditions is much less, and no dependence on prior aging is discernible. The corrosion…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrimary isotope effects and general base catalysis in the hydrolysis of trans-dichloro(1,9-diamino-3,7-diazanonane)cobalt(III) cationsEtmina Ahmed, Marie L. Tucker, and M. L. TobeCite this: Inorg. Chem. 1975, 14, 1, 1–5Publication Date (Print):January 1, 1975Publication Hist…
The laticifers of Nelumbo nucifera Gaertn. (Nelumbonaceae) occur in vascular bundles and separately from these in the ground parenchyma. In common with laticifers in some other plants, they pass through a stage when they contain numerous small vacuoles, or vesicles, which later merge with the central vacuole. Osmiophi…
Abstract The r ‐values of styrene with p ‐divinylbenzene or m ‐divinylbenzene (DVB), respectively, as determined by several authors, deviate strongly from the ideal straight line in the binary polymerization diagram. In an attempt to convert the various r ‐values into coincident e ‐and q ‐values according to the equat…
The grain size effect on the apparent yield and flow stresses up to 20% strain has been investigated in polycrystalline copper and Cu–Al alloys of various grain sizes at 77 and 293 K.The apparent yield stress satisfies the Hall-Petch relation in all specimens. In copper, however, the flow stresses cannot be expressed…
O-Metallated yellow iridium(I) complexes, [[graphic omitted])}{PBut2(C6H4OX–2)}](I; X = H or Me), are described. 1H–, 31P–, And 1H–{31P}-INDOR studies show a complex behaviour with temperature, probably due in part to the complexity of the spin systems and to the presence of rotational isomers. A benzene solution of (…
e d 2 e x t e n s i v e l y .