Materials Literature
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The specific heats of glasses reported in the literature since 1951 were studied in relation to the Sharp‐Ginther equation. It was found necessary to change the factors previously furnished for K 2 O and B 2 O 3 . The other factors were found to be satisfactory when compared with the new measurements. It was discovere…
Abstract Measurements have been carried out on the equilibrium between ferrous and ferric iron in wüstite containing various amounts of magnesium oxide, at various partial oxygen pressures and 1400 °C. These data, together with the data of Darken and Gurry [2] for the pure wüstite, are used for a discussion of the app…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChelates of Violuric AcidPeter A. Leermakers and William A. HoffmanCite this: J. Am. Chem. Soc. 1958, 80, 21, 5663–5667Publication Date (Print):November 1, 1958Publication History Published online1 May 2002Published inissue 1 November 1958https://pubs.acs.org/doi/10.1021/ja0…
The temperature dependence of the microhardness of the quartz structures of both SiO 2 and the isomorphous compounds AlPO 4 , GeO 2 , and LiAlSiO 4 has been examined. Particular attention has been given to the effects of the high‐low inversion, which has been found to be anomalous relative to the behavior of other pol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on the Schardinger Dextrins. X. The Interaction of Cyclohexaamylose, Iodine and Iodide. Part I. Spectrophotometric Studies1John A. Thoma and Dexter FrenchCite this: J. Am. Chem. Soc. 1958, 80, 22, 6142–6146Publication Date (Print):November 1, 1958Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange and Diffusion of Oxygen in Crystalline Cuprous OxideWalter J. Moore, Yukiko Ebisuzaki, and James A. SlussCite this: J. Phys. Chem. 1958, 62, 11, 1438–1441Publication Date (Print):November 1, 1958Publication History Published online1 May 2002Published inissue 1 Novem…
The effect of impurities is inexplicable by the accepted theory of crystal growth. In this report a mechanism is presented which describes the specific action of crystal-growth poisons. By this model the step motion in growth is hindered and nucleation rate on an ideal surface is increased. To rationalize the effect o…
On the faces of a type I diamond octahedron of particularly good quality there have been observed clusters of trigons which appear to be associated with a centre of strain in the interior of the stone. The trigon patterns show features which can only have been the result of surface dissolution. These observations are…
The structure of the conduction band of Ge is completely taken into account in calculating the cross section in second-order Born approximation. The second-order matrix element contains first-order matrix elements of electron-photon interaction (derived for anisotropic mass) and of electron-scatterer interaction. Scat…
The magnetic-field-dependent data of Soule for the Hall effect and magnetoresistance in graphite have been analyzed using a multicarrier model. An improved mode of analysis is used, in which the magnetoconductivity tensor elements are computed as functions of magnetic field strength from experimental data, and then fi…
Abstract Measurements of crosslinking, trans ‐vinylene formation, and hydrogen evolution have been made on high‐ and low‐density polyethylenes irradiated at temperatures from about −170 to +240°C. Crosslinking produced during irradiation is mainly in the amorphous areas of the polymer; whereas trans ‐vinylene unsatura…
The bands of the γ system of the PO molecule have been photographed under high dispersion (0.35 Å/mm). A rotational analysis of the 0–0, 0–1, and 1–0 bands is given, which differs from the one previously given by Sen Gupta. In addition, four more bands, namely, the 1–2, 2–1, 2–3, and 2–4 bands, have been analyzed. The…
Ranges of solid solution have been investigated in systems composed of either two A 2 III B 3 VI compounds or one A III B V and one A 2 III B 3 VI compound. It is found that in practically all cases considered complete solid solution throughout the whole range of composition can be obtained, but that in some cases thi…
Measurements of the electrical conductivity, Hall coefficient, thermoelectric power and Nernst coefficient on specimens cut from zone melted Bi 2 Te 3 and on a single crystal are described. The current flow was parallel to the cleavage planes and the galvanomagnetic effects of the single crystal were measured with the…
A general review of luminescent materials is given, with some emphasis on the more recent applications. The theoretical aspects of the absorption and emission processes are discussed briefly.
Abstract Although the production of foam rubber on an industrial scale has been for a considerable time a rather well-controlled process, all factors involved are still insufficiently known. The most critical phase of the manufacturing process is undoubtedly the gelation of the foam produced. This consists of a clotti…
Abstract The rational synthesis of the ‘cyclic’ tetranuclear p ‐cresol novolak ( VIII ) from the corresponding resole ( VII ) which was synthesized from 3‐bromo‐2:2′‐dihydroxy‐5:5′‐dimethyldiphenylmethane ( I ) has been accomplished in accordance with the scheme given below. A molecular model of the resole ( VII ) ind…
The yield and fracture stresses of unirradiated and irradiated End steel have been measured at 20°, −78°, and −196°c. From the change in yield stress, [sgrave], (shear), with grain size, 2d, the values of [sgrave] i and kv in a Petch type equation, [sgrave]v=[sgrave] i +kv d −1/2, have been determined. The term kv is…
Magnetic properties of synthesized solid solutions of ilmenite (MgTiO 3 , MnTiO 3 , FeTiO 3 , CoTiO 3 and NiTiO 3 ) and hematite (αFe 2 O 3 ) are investigated and it was confirmed that those of any ilmenite-hematite series can be divided into three parts: i) pure ilmenite, ii) solid solutions with R\bar3 crystal symme…
Abstract The bands due to stretching of OH groups in celluloses I, II and III I have been studied with plane polarized infrared radiation. The spectra show that all three crystalline modifications contain OH groups which make an angle much smaller than 55° with the chain direction, while other OH groups make angles gr…