Materials Literature
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The inhomogeneous mechanism for the crystallographic transformation of brucite (Mg(OH)2) to MgO postulated by Ball and Taylor 1 is re-examined. This postulate was based upon the observation of X-ray reflections attributable to a spinel structure in decomposed brucite crystals. In the present work a relatively pure Mg(…
Abstract This paper treats some theoretical premises determining peculiarities of acetylene polymerization and properties of polyene systems containing carboxy groups. Some kinetic mechanisms of the radiation polymerization of propiolic acid in the liquid phase were experimentally studied. It is shown that solid‐state…
Systematic studies were carried out all the formatioll of recl)'stallizatioll. texture of 3 0 oSi-Fe single crystals with /Jre-selected orientation which were cold rolled to a range from 6 to 95%, Change rif the annealing texture was successively examined by using the X-ray pole figure method in relation to the metall…
Abstract Stacking faults are observed by transmission electron microscopy in face centred cubic TaC 0.75 . These stacking faults have the same contrast as intrinsic faults in face centred cubic metals; they do not exist in nearly stoichiometric carbides. No metallic plane relaxation is detected in the neighbourhood of…
The current-time relationship is derived for the following reaction scheme for electrocrystallization: A discussion of the limiting cases for potentiostatic experiments is presented. The corresponding results for the relaxation techniques (particularly the faradaic impedance) are also obtained.
The elastic properties and thermal expansion coefficients of two‐phase ceramic bodies were determined in order to study the effect of the difference in thermal expansions of the two phases. Room‐temperature elasticity was determined by a dynamic method. These values were extrapolated to theoretical density to obtain v…
The fruitful application of refined analytic techniques for treating mass transfer problems in electrochemical systems, whether these systems be expe:rirlental tools or industrial pr:::-ces.ses,requi:"e
The electrical conductivity of calcium titanate crystals grown by flame-fusion and fluxed-melt methods has been studied. The conductivity of both types of crystals has been found to be time dependent and initial values between 10 -11 and 10 -13 ω -1 cm -1 are reported, depending upon the electrodes used. Ohmic behavio…
This paper presents the results of measurements of the properties of GeSeTe, a new chalcogenide glass. When purified, the glass exhibits good transmission in the infrared between 2 and 18 μ. Electrically the glass behaves as a semiconductor with an energy band gap of 1.72 eV. Several other properties of GeSeTe and clo…
Some properties of Cu-Zr-Cr alloys containing more than about 0.5% zirconium and various amounts of chromium have been studied. The isothermal sections of copper corner of Cu-Zr-Cr equilibrium diagram mainly at 950° and 900°C have also been studied. The results obtained were as follows.(1) The properties of the alloys…
valency angle' for sodium pyrophosphate is 127 . Of the three bond lengths in the -PO 3 group, P-O(3) = 1.512/~ is slightly the shortest. This seems to correlate with the involvement of 0(3) in the smallest O-P-O(1) angle, since a similar effect occurs in the above three sulphates.
Between the years 1927 and 1938 the French engineer E. Roth developed a powerful method for the solution of boundary-value problems in electrical engineering. He applied the method to problems in heat conduction and magnetic-field problems in electrical machines and transformers, although the application of the method…
Abstract The excellent high temperature properties of aromatic polyimides, well known in films and enamels, have also been demonstrated in fibers. Current investigations show that experimental aromatic polyimide fibers have a very high level of thermal and dimensional stability and property retention at high temperatu…
Abstract The kinetics of poly(vinylene carbonate) (PVC) and ethylene carbonate (EC) aminolysis with n ‐butylamine (BA) in DMF solution was investigated. The EC aminolysis is catalyzed by final product and by BA itself but the reaction kinetics follows satisfactorily the equation – d [BA]/ dr = k [BA][EC]; k 2 increase…
A. Sacco and M. Rossi, Chem. Commun. (London), 1967, 316 DOI: 10.1039/C19670000316
Abstract Six of the eight magnetoconductivity components of trigonal Se are measured up to 30 kG over the temperature range 83 to 300 °K. Unlike the Hall mobility, which increases exponentially with temperature, the magnetoconductivity mobility decreases with rising temperature and, at high temperatures, is approximat…
Derivations are given for several expressions relating density expansion coefficients of the net radial distribution function, the direct correlation function, and the x-ray scattering function. To the first order in density, non-additivity effects are included.
各種の金属化合物を触媒として用いて, ビス-β-ヒドロキシエチルテレフタレートの重縮合によってポリエチレンテレフタレート (PET) を合成した。得られたPETの融点およびジエチレングリコール (DEG) 含有量は用いた触媒の種類によって異なり, PETの融点降下は主として副反応によって生成したDEG単位に基いている。さらに, PETのモデル化合物としてβ-ヒドロキシエチルベンゾエートの分解反応を調べた結果, PETの融点降下をもたらしているエーテル結合は主として次の2種類の反応によって生成しているものと推定される。1) 重縮合触媒から誘導されたBronsted酸によるアルコールの脱水縮合。2) PETの末端ヒドロキシエチルエステ…
The red precipitate formed when potassium pertechnetate is reduced with iodide ions is the pentachlorohydroxy-complex K2Tc(OH)Cl5. The compound has a cubic crystal structure and is isomorphous with K2TcCl6. It is paramagnetic and has an electronic spectrum analogous to that of the hexachloro-salt.
Binary mixtures of calcium nitrate with potassium nitrate can be supercooled extensively below their normal solidus temperatures. Comparable binary mixtures have now been studied with sodium, rubidium or caesium as the monovalent cation. Viscosities are in the sequence Na>Cs>Rb>K at high temperatures. On progressive c…