Materials Literature
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The crystal structure and internal defects of the banded martensite in a quenched Cu-24.5 wt%Sn alloy have already been investigated by Nishiyama et al. However, since their results are rather unexpected in some respects, the crystal structure and the morphology were reexamined by means of electron microscopy and sele…
Effects of alloying elements on the pitting corrosion resistance of 17Cr-16Ni steels with and without 4% Mo were evaluated by the corrosion rate in 10% FeCl3·6H2O and 4% NaCl added with hydrogen peroxide and by the polarization measurement in 0.1N NaCl+0.1-0.25N Na2SO4 at 40°C. The elements, the content of which was v…
Supporting evidence for complex ion formation in MgCl 2 alkali chloride melts was sought from a single crystal X-ray analysis of the title compounds. Crystals of K 2 MgCl 4 are tetragonal, a = 4.94, c = 15.58 Å, Z = 2, space group I 4/mmm. The compound is isostructural with K 2 NiF 4 , and was determined with MoK α di…
In an attempt to reach a quantitative understanding of the physical mechanism of multi-stage flash evaporation, an experimental study was made of flash evaporation phenomena in a 1.0 m long and 10 cm wide flash chamber with and without baffle plates.The experiments covered the range of liquid flow rates between 6 and…
During diffusional creep, the grains of a polycrystal move relative to each other to maintain specimen coherency. This movement is analysed and it is shown that grain-boundary sliding and diffusion creep do not generally make separate contributions to the total creep strain.
The effect of thermal annealing (up to 2000 °C) on the structure : nd physical properties of irradiated graphite has been investigated. The irradiation was carried out in the reactor at 100–900 °C up to : dose rate of about 15·1020n/cm2(En > 0.18 MeV). Two types of the material were tested: pyrolytic and reactor graph…
Differential thermal analysis shows that in soils organic matter and carbonates react in very different temperature ranges. An automatic CHN Analyzer was therefore used to determine the organic and inorganic carbon content of soils. At 500°C complete oxidation of soil organic matter occurs without appreciable decompos…
Abstract Grafting of acrylic acid onto methylcellulose backbone was studied using potassium persulfate as initiator. Different variables affecting the extent of grafting were studied. The copolymers with more than 20% grafting became insoluble in water. The solubility of the graft copolymer in different solvents and m…
In common with other aquatic angiosperms, Nelumbo nucifera Gaertn. has a relatively strongly developed phloem tissue. The vascular system consists of discrete collateral bundles in which no cambium develops and the phloem and xylem are separated by a narrow layer of parenchyma cells. The phloem consists of sieve eleme…
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…