Materials Literature
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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…
Abstract The isolation, characterisation and chemical investigation of the cardiac glycosides of the dried leaves of Isoplexis isabelliana (W EBB ) M ASF . are described. 7 glucosides B, D, E, J (monoside), K, M, and 1 (monoside) could be obtained in homogenous form, 3 others were mixtures (“A” = A 1 + A 2 , “C” = C 1…
Abstract Mössbauer investigations are reported for five different compositions of gallium iron oxide and for iron‐substitutedβ‐Ga 2 O 3 , and AlFeO 3 . The spectra confirm the ferrimagnetic spin‐arrangement of Ga 2−x Fe x O 3 . Information is obtained on the cation distribution in iron‐substituted (β‐Ga 2 O 3 and Ga 2…
The macroscopic strength of an oriented medium is investigated under the assumption that processes of breaking and reforming of microscopic components in the medium may occur. The differential equation governing the time-dependent variation of the number of load-carrying components is considered. Emphasis is placed on…
This paper reviews methods which have been used to elucidate the quantity Dq in cubic and non-cubic molecules. A novel graphical method allowing the rapid determination of Dq and B from spin-allowed absorption bands of high-spin d 2, d 3, d 7, and d 8 complexes is introduced. It is possible to calculate both in-plane…
A critical evaluation is made of the procedure and the important parameters involved in estimating the stacking-fault energy Γ from x-ray diffraction measurements of deformed materials. The published data for the Ag-In and the Cu-Zn system are carefully analyzed and compared with results obtained by transmission elect…