Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Chemical Thermodynamic Properties of Calcium HydroxideW. E. Hatton, D. L. Hildenbrand, G. C. Sinke, and D. R. StullCite this: J. Am. Chem. Soc. 1959, 81, 19, 5028–5030Publication Date (Print):October 1, 1959Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Deuterium on the Strength of Hydrogen Bonds1Melvin Calvin, Jan Hermans Jr., and Harold A. ScheragaCite this: J. Am. Chem. Soc. 1959, 81, 19, 5048–5050Publication Date (Print):October 1, 1959Publication History Published online1 May 2002Published inissue 1 October 1…
According to the molecular theory of rubber elasticity, the stress τ is related to the relative length α in simple extension according to τ=kT(ν/V)<α>2(α−1/α2), where (ν/V)<α>2 is a parameter of the network structure. Improved agreement with experiment has been claimed through use of the re…
Controlled dendritic growth of germanium from the melt yields long thin strips whose principal surfaces are optically flat {111} crystallographic planes except for the occasional presence of small steps. The crystals grow rapidly in the $〈211〉$ direction, have twin planes parallel to the flat surfaces, and can withsta…
The origin of the large tetragonal distortions which occur in a number of transition metal oxides having the spinel structure has been examined recently by Dunitz and Orgel in terms of the crystal field theory. According to these authors the macroscopic distortions arise as a consequence of a Jahn-Teller type distorti…
The impact test has been carried out on the mechanical twinning of 99.98% pure tin crystals, the time of stressing being 10 -3 sec. The twinning occurred with a sharp yield process, when the [001] axis was nearly perpendicular (±15°) to the specimen axis. The upper yield stress scattered from 0.7 to 2.5 kg/mm 2 , whil…
Abstract A study was made of the polymerization of siloxances with transient basic catalysts. These catalysts are active as polymerization catalysts for siloxanes and will decompose rapidly to inactive products at elevated temperatures with the formation of stable polymers. Several quaternary ammonium bases were studi…
Techniques are described for the production of heavy concentrations of aquatic Hyphomycete spores, for estimating the spore concentration, the sedimentation rate of spores and their trapping efficiency on smooth cylinders. No correlation could be discovered between the rates of sedimentation and spore shape. Trapping…
Abstract This article is a short reveiw of the development of our knowledge on the texture of crystalline polymers. It begins by quoting the conventional fringed micelle model which has proved so useful for much of the earlier workon the crystallization in polymers. It is shown further how gradually new ideas had to b…
MnTiO 3 and NiTiO 3 have a rhombohedral crystal structure similar to FeTiO 3 in which layers of Fe and Ti atoms alternate along the rhombohedral axis with oxygen layers between them. A powder neutron diffraction study shows that MnTiO 3 has a magnetic structure with the Mn 2+ spins antiparallel within each layer. On t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal Chelates of Tetraphenylporphine and of Some p-Substituted Derivatives1,2Daniel W. Thomas and Arthur E. MartellCite this: J. Am. Chem. Soc. 1959, 81, 19, 5111–5119Publication Date (Print):October 1, 1959Publication History Published online1 May 2002Published inissue 1 O…
The characteristic electron energy loss spectrum of magnesium has been measured by analyzing the energy distribution of 750-, 1000-, 1505-, and 2020-ev electrons scattered by an evaporated specimen through 90\ifmmode^\circ\else\textdegree\fi{}. The spectra were similar in form to those previously obtained with aluminu…
The reversal of the spontaneous polarization in a ferroelectric crystal is governed by two mechanisms: the nucleation of new domains and the growth of these domains by domain wall motion. We have investigated the switching properties of triglycine sulfate (TGS) as a function of applied electric field, temperature, and…
Abstract According to a recent theory of the glassy state, chain stiffness is the main determinant of the glass transition. In this paper the theory is applied to the problem of predicting the glass temperatures of copolymers of varying composition and therefore varying chain stiffness. It is found that a simplified t…
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