Materials Literature
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Thermoluminescence (TL) and deformation luminescence (DL) studies in KC1 γ-irradiated at room temperature are reported. The roles that F-centres and their higher conglomerates on the one hand, and V2- and V3-centres as recombination centres on the other hand, play in these processes are specified. Two peaks at 2.5 eV…
Abstract Induction periods for the precipitation of CaSO 4 .2H 2 O in the concentration range 0.05‐lM have been determined by the stopped‐flow method utilising changes in the solution conductivity after nucleation and growth. The measured induction periods were insensitive to calcium sulphate concentration, suggesting…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic study of a series of iron carbido clustersB. A. Sosinsky, N. Norem, and J. ShellyCite this: Inorg. Chem. 1982, 21, 1, 348–356Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inissue 1 January 1982https://pubs.acs.o…
Liquid-liquid equilibria were determined in the following binary systems: 1,2-ethandiol/toluene, 1,2-ethandiol/xylene, 1,2-propandiol/toluene, 1,2-propandiol/xylene, 1,4-butandiol/toluene, 1,4-butandiol/xylene, 1,3-butandiol/toluene, 1,3-butandiol/xylene, 1,3-butandiol/ p -xylene, 2,2'-dioxydiethanol/toluene, 2,2'-dio…
Transitions between phases II, III and IV of ammonium nitrate are studied in some detail using microscopy, dilatometry, electrical conductivity and differential scanning calorimetry (d.s.c.). Clear evidence of a two-step IV–III transformation is presented and the competition between phase transitions IV–II and IV–III–…
The diffusivity and solubility of hydrogen in both annealed and as-cold-rolled copper were determined at room temperature by means of the electrochemical permeation method under the galvanostatic charging condition. Results obtained were as follows:(1) The observed build-up transient of hydrogen permeation through Cu…
ESR spectra of paramagnetic Pb3+ with 6s1 electronic configuration induced by γ-irradiation at 77K were measured for a wide variety of oxide glasses. It has been found that the Pb 6s-character of the magnetic electron, evaluated from the analysis of the hyperfine structure due to a 207Pb nucleus (nuclear spin 1/2, abu…
The crystal and molecular structure of the title compound has been determined from single-crystal X-ray diffraction data and refined to a final R value of 0.053 using 2 514 independent reflections. The compound belongs to the space group P42/n of the tetragonal system with two tetrameric molecules in a unit cell of di…
High-momentum-resolution neutron and x-ray scatterings have been carried out on recently grown ${\mathrm{Nb}}_{3}{\mathrm{Sn}}_{1\ensuremath{-}x}{\mathrm{Sb}}_{x}$ single crystals. It was shown that, in addition to the well-known cubic-to-tetragonal martensitic phase transition at ${T}_{M}$, another phase transition t…
The high ratio of the SiC grain‐boundary energy to the Si(l)/SiC interfacial energy is used to explain two microstructural observations: (1) the penetration of dense SiC by Si(l), and (2) the morphology of the SiC formed when glassy carbon is reacted with Si(l). Comments are made concerning the mechanism of the Si+C r…
標題の系のガラス化範囲を求めた. この系のガラスの導電率の組成及び温度依存性を100℃からガラス転移点 (Tg) の10°-20℃下の温度までの範囲で測定した. また密度, 熱膨張率, Tg, 遷移金属イオンの還元イオン分率を測定した. 電気伝導機構をMottによるスモール・ポーラロン・ホッピング理論によって検討した. これらのガラスには断熱近似 (トンネル係数αを零とする) が, 光学フォノン振動数 (ν0) の値1けた以内程度の誤差で, ほぼ適用できた. しかし他の実験結果と矛盾しないようなα及びν0の値は得られなかった. 導電率の組成依存性を決定する因子としては活性化エネルギーが支配的であった.約10mol%以下のFe2O3…
The profile of an axisymmetric sessile drop is described by an analytically insoluble second-order differential equation, which can be obtained either from Laplace's equation or by employing the calculus of variations to minimise the free energy of the solid/liquid/fluid system. Most reported methods of solution invol…
To clarify the relation between a molecular structure and an order parameter of a dichroic dye of a guest-host liquid-crystal cell, a ratio l/d of a length l to a diameter d of a circumscribed cylinder of the dichroic dye is used as a parameter. Experimental results clarify that there exists an obvious correlation bet…
Ground-state CHF radicals, formed in the gas phase by infrared multiple photon dissociation, and detected by laser-induced fluorescence, react with NO and O2 with bimolecular rate constants of (7.0 ± 0.4)× 10–12 and <5 × 10–16 cm3 molecule–1 s–1, respectively, at 295 K. NCO (X2Πi) is detected as an important product o…
A concentrated solution of K[MnO4] undergoes a ready reaction with acetylacetone, in the absence of any buffer, giving a very high yield of the title compound, [Mn(acac)3]. The pH of the solution, recorded immediately after the formation of crystalline [Mn(acac)3], was found to be ca. 5. Electron impact induced mass s…
Crystallized quartz has been obtained from amorphous silica prepared by the hydrolysis of silicon alkoxide containing calcium or magnesium alkoxide (10 mol %). The crystallization of CaSiO3 and MgSiO3 is observed prior to that of quartz. Crystallization isotherms are described by the contracting cube equation 1 –(l –f…
Les argiles kaoliniques exploitées industriellement dans le bassin des Charentes sont essentiellement composées de kaolinite mal ordonnée à bien ordonnée, de mica, de quartz et d'anatase. A partir de considérations statistiques sur le statut du fer, les auteurs présentent une méthode d'analyse minéralogique quantitati…
The four primary Zircaloy fuel cladding deformation phenomena—axial elongation, circumferential creep, ovalization, and ridging—have been investigated for fuel irradiated in four modern pressurized water reactors. The axial elongation of fueled and nonfueled rods is examined by a regression fit for dependence on fluen…
(1982). Solidification Structure of Gas-Atomized High-Speed Steel Powders. Powder Metallurgy: Vol. 25, No. 1, pp. 1-9.
The influences of 11 elements in sheet steel, temperature and Al content in zinc bath on the adhesion were investigated by use of continuous galvanizing line and laboratory galvanizing simulator. The adhesion was remarkably affected by Si in the steels, the temperature and Al content.The influences of Ti, Si and P in…