Materials Literature
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The heat capacity of α-quartz has been computed over the temperature range 10–700°K, and that of vitreous silica from 10° to 900°K. Debye θ's obtained from the T3 law below 10° were used for the ``translational'' degrees of freedom, and recent infrared and Raman data for the other frequencies. Cp—Cv was negligible for…
The details of the phonon scattering produced by point imperfections in insulating crystals has been determined from measurements of the thermal conductivity of six single crystals of KCl from 3\ifmmode^\circ\else\textdegree\fi{}K to 30\ifmmode^\circ\else\textdegree\fi{}K as a function of the concentration of point im…
Abstract Muscovite and K-feldspar (adularia) were dry-ground to — 200/inch particles, which were suspended in water. These suspensions were “titrated” with KCl, and the pH was recorded as a function of KCl concentration and temperature. The results indicate that muscovite and adularia react with water to produce a sur…
Abstract An extensive survey of clay mineral relationships in the subsurface Wilcox formation (Eocene) has shown progressive diagenetic conversions with depth. Montmorillonite, a common constituent of Wilcox outcrop material, becomes loss evident below 3000 ft and is not normally found in an unmixed state below the 90…
The reader is introduced to some of the main points of semiconductor phenomena. Concepts of wave properties of electrons, discrete energy levels, free electrons in metals, and band theory of solids, show how semiconductors differ from metals and insulators. This is followed by a discussion of doping to create impurity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGalvanic Cell Measurements in the Copper–Silver SystemRussell K. Edwards, James H. Downing, and Daniel CubicciottiCite this: J. Phys. Chem. 1957, 61, 2, 255–256Publication Date (Print):February 1, 1957Publication History Published online1 May 2002Published inissue 1 February…
Distribution of potential within a corrodent was analyzed using several geometric arrangements of electrodes which lay in a common surface. Polarization was assumed to follow Wagner’s useful relation as it varied from point to point on the electrode in response to the local corrosion current. The distribution of the c…
The determination of the activation energy of the Eyring viscosity and diffusion theory from the isobaric temperature coefficient of the transport property is shown to be inconsistent with the assumed mechanism of the process. An alternative form of the Eyring theory makes use of an activation energy determined from t…
Abstract Electron microscope studies of chrysotile show that tubes are present in bulk specimens and that these tubes commonly have fuzzy, amorphous-looking material on both the inside and outside. Similar material is associated with synthetic chrysotile and has been noted previously in halloysite specimens. The exist…
Abstract Tobermorite [Ca 4 (Si 6 O 18 H 2 )Ca·4H 2 O] is a hydrated calcium silicate mineral with a layer structure which in some respects resembles that of vermiculite. Its dehydration has been studied using single crystals from Ballycraigy, N. Ireland. The three most frequently encountered hydration states are chara…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of Aqueous Chromic Acid and Some Properties of the Resulting Solid Phases1B. J. Thamer, R. M. Douglass, and E. StaritzkyCite this: J. Am. Chem. Soc. 1957, 79, 3, 547–550Publication Date (Print):February 1, 1957Publication History Published online1 M…
Abstract The alkaline and acid hydrolyses of polyvinylamides and their N ‐substitution derivatives have been studied and compared to the alkaline and acid hydrolyses of simple homologous substances. The rates of reaction have been followed conductometrically, and the rate constants evaluated at different temperatures…
Abstract Studies of the Recent indicate that, at the most, somewhat less than half the clay minerals are altered to any extent in a marine environment. Probably most of this alteration is in the form of cation adsorption or reconstitution of slightly weathered illites and chlorites to their original form. There appear…
The d.c. Hall coefficient and resistivity of six semiconducting diamonds have been measured as a function of temperature from 200 to 800°K. All the diamonds were p-type semiconductors. From the measurements the effective mass of the charge carriers, the concentration of donor and acceptor centres, the activation energ…
ear t hermal expa nsion of so m e ni ckel a ll oys (ma nganese ni ckel, H osk ins Alloy 667, In co nel, Evanohm, Monel metal, M-M-M all oy, IIIium all oy, and vVasp a ll oy) for van ous te mperatlll'e ra nges between 20 a nd 1,000 C are give n. Duri ng t he first heatin g of Inco nel all oys (l)roba bly wit h a s uper…
Abstract The frequency distribution or relative abundance of minerals in soils varies with the five principal classes of factors that govern soil formation. The characteristics of the minerals of the parent material, the time factor, climatic factors, relief factors and biotic factors each can be shown to have importa…
Abstract The scattering of phonons by electrons is calculated, assuming the usual electron–phonon interaction, for a parabolic band whose degeneracy temperature is comparable with the temperature of the lattice. The contribution to the thermal resistance is given by an exact formula, subject only to justifiable assump…
Research Article| February 01 1957 The amino acid composition of fish collagen and gelatin J. E. Eastoe J. E. Eastoe 1The British Gelatine and Glue Research Association, 2a Dalmeny Avenue, London, N. 7 Search for other works by this author on: This Site PubMed Google Scholar Biochem J (1957) 65 (2): 363–368. https://d…
The origins of the magnetic anisotropy energies of the crystals of FeO and CoO in the state of antiferromagnetic ordering and the mechanism of the deformation they suffer when the antiferromagnetic ordering sets in are investigated from the atomistic point of view, following the line developed in the preceding paper.…
The atomic positions of ferroelectric BaTi${\mathrm{O}}_{3}$ in its orthorhombic phase have been determined by a singlecrystal neutron diffraction analysis. Pillar-shaped crystals with their major axes along the cubic [110] direction were maintained as single domains by the application of an electric field. The struct…