Materials Literature
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The existence of an allotropic transformation in hafnium, suggested by Zwikker in 1926, has been confirmed. The transformation temperature is 1310±10°C. The high temperature beta-form is probably body-centered cubic.
Measurements have been made of the refractive index of amorphous selenium in the red and near infra-red spectral region. The absorption coefficient of amorphous selenium has been measured in the ultra-violet, visible and near infra-red spectral regions. The transmission coefficients of several single crystals of selen…
This paper examines the relationship of structural geometry to the abrasion-resistance of textile fabrics. It is pointed out that the durability of a fabric can be significantly altered by modifying its structural design, without change in the fiber used in its manufacture. Earlier textile studies and heretofore unpub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVolumetric and Phase Behavior in the Ethane-Propene SystemR. A. McKay, H. H. Reamer, B. H. Sage, and W. N. LaceyCite this: Ind. Eng. Chem. 1951, 43, 9, 2112–2117Publication Date (Print):September 1, 1951Publication History Published online1 May 2002Published inissue 1 Septem…
The appearance of anisotropic phase in the unipolar coacervations of tobacco mosaic virus or bentonite solutions are explained theoretically, and the recent theory of Onsager is confirmed. As has been emphasized already by Langmuir, the repulsive forces between solute molecules and the force arising from thermal agita…
Twenty‐five compositions in the binary system were reacted in the solid state at temperatures ranging from 1000° to 1670 °C. and examined by X‐ray and optical methods. Four compositions near the eutectic were melted to glasses and treated by the quench technique at a temperature of 1575°C. The data obtained indicate s…
Published data on the effect of composition, temperature, crystallization, and thermal history on measured values of the specific heat of glass are reviewed. The Einstein‐Debye relationship between temperature and atomic heat of solids does not apply to vitreous materials. The actual type of function expressing variat…
Detailed investigations on the dielectric and the thermal properties of PbZrO 3 have been made and compared with those of ferroelectric BaTiO 3 . In contrast with barium titanate, volume change at the transition near 220°C has turned out to be expansion, being δV/V=2.7×10 -3 , and a large amount of anomalous specific…
A description is given of edge and screw dislocations in a close-packed cubic lattice, which leads up to an account of the theory of Frank and Read of the origin of slip bands. Consideration is then given to a crystalline grain containing Frank-Read sources; it is shown that one has to expect cross-slip and the format…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectra of the Metallo-derivatives of α,β,γ,δ-TetraphenylporphineG. D. Dorough, J. R. Miller, and Frank M. HuennekensCite this: J. Am. Chem. Soc. 1951, 73, 9, 4315–4320Publication Date (Print):September 1, 1951Publication History Published online1 May 2002Published inissue 1…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Hydrogen Positions in Uranium Hydride by Neutron Diffraction1R. E. RundleCite this: J. Am. Chem. Soc. 1951, 73, 9, 4172–4174Publication Date (Print):September 1, 1951Publication History Published online1 May 2002Published inissue 1 September 1951https://pubs.acs.org/doi/…
Electrical conductivity, Hall effect, and Seebeck effect have been measured on two sets of polycrystalline samples of $\ensuremath{\alpha}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ and $\ensuremath{\alpha}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ containing from 0.05 to 1.0 atomic percent titanium ($n$-type impurity). One set of sam…
In this paper, some of the factors which influence the appearance of Lüders bands in mild steel are studied. It is shown that the Lüders band is adequately described by a uniform shear front, spreading over the specimen. In coarse-grained specimens, experiments indicate that this front becomes diffuse; diffuse bands a…
Abstract The infra-red absorption bands associated with the peptide groups in globular proteins, folded synthetic polypeptides and α-fibrous proteins are very similar. The spectra of denatured globular proteins, extended chain synthetic polypeptides and β-fibrous proteins are also very similar. Denatured fibrous insul…
Abstract An apparatus is described in which the thermal conductivity of solids can be determined at any temperature between 2 and 90°K. Several glasses and dielectric crystals have been measured. It had previously been found that at high temperatures the conductivity of glasses is proportional to the specific heat, bu…
Abstract The statistical equilibrium of phonons in the presence of a temperature gradient is investigated, and a general formula for the thermal conductivity of dielectric solids is obtained. This is applied to quartz glass, giving good agreement with values observed by Berman (1951), and to crystals. Comparison betwe…
Abstract L'étude de la cellulose régénérée des composés de gonflement que fournissent avec NH 3 liquide la cellulose native et la cellulose mercerisée conduit à la définition de deux formes correspondantes aux matières de départ: les celluloses IIIα et IIIβ. L'action de l'eau fournit avec le réseau IIIα un réseau élar…
Single crystals of selenium have been grown from the vapour phase and their conductivity and thermo-electric power were measured over a range of temperatures. The Hall effect was determined for one crystal. The conductivity obeys a relatively simple exponential law σ = σ 0 exp (- e E / k T ), with e E = 0.13 eV. and t…
Abstract The elastoviscous behavior of polyisobutylene may be interpreted in terms of a mechanical model consisting of a distribution of Maxwell elements connected in parallel. The structure of this “generalized Maxwell model” is specified by the distribution of relaxation times of the component elements. The relaxati…