Materials Literature
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Micropowders of stoichiometric copper, nickel, and cobalt ferrites were prepared by low temperature (<800°C) treatment of the coprecipitated metal oxalates. The magnetic properties of each ferrite were determined as functions of particle or crystallite size in the range from 70 to >2000 A. Particle sizes…
The axial thermal‐expansion coefficients of β‐eucryptite have been measured and correlated with the volume expansion of an aggregate measured dilatometrically. A mechanical analogy to the structure of β‐eucryptite is suggested which may explain the pronounced thermal contraction in the c direction.
Abstract With three polymers widely different in polarity—polyethylene terephthalate, polyethylene, and nylon 610—the water vapor permeability P of unoriented films has been shown to increase as the amorphous fraction X a is increased, following the relation P = P a X a 2 . For polyethylenes, adherence to this relatio…
An experimental investigation was made at elevated temperatures and pressures of the hydrolysis of K-feldspar to mica+silica and of mica to kaolinite. Values of the equilibrium quotient, m <sub>KCl</sub> /m <sub>HCl</sub> , were determined at temperatures ranging from 200 degrees to 550 degrees C. The solution pressur…
The concept of octahedral site preference energy in spinels has been extended to include Madelung and short-ranged as well as crystal field terms. A set of site preference energies is formulated which can be used to predict the ionic distribution of spinels involving the nontransition as well as the transition ions. T…
Mechanical relaxation measurements are used extensively to obtain information on the diffusion rate of interstitial solute atoms in body-centered cubic metals. Such studies have been stimulated by a model, developed by J. L. Snoek, which yielded a relationship between a relaxation time, an experimental parameter, and…
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Methods of preparation and results of measurements of the dielectric constant of solid-solution single crystals of KNb${\mathrm{O}}_{3}$ and KTa${\mathrm{O}}_{3}$ are presented. Data are given for the composition range 0-80 mole percent KTa${\mathrm{O}}_{3}$ in the temperature interval -180\ifmmode^\circ\else\textdegr…
The influence of temperature and strain rate on the flow stress of polycrystalline aluminium, and single crystals of aluminium, copper and silver was studied. Tensile tests were carried out at various temperatures down to 1.7°K. The results indicate that the reversible change of flow stress (after correction for varia…
Diffraction patterns obtained from atomically clean germanium surfaces contained half-integral order beams in (110) azimuths for both (100) and (110) surfaces and in all azimuths for the (111) surface. These results are considered to be due to displacements of surface atoms from their normal bulk lattice positions in…
Abstract The dissociation of hydrogen at a tungsten filament has been studied in the temperature range 1200 to 1800°K and at pressures between 10-2 and 10-6 mm. The results obtained differ from those found in the literature and it is shown that this is because the surfaces employed by previous workers were contaminate…
Abstract Es werden die textilchemischen Eigenschaften (Oberflächenspannung, Grenzflächenspannung, Netzvermögen, Emulgiervermögen, Schaumvermögen, Schaumbeständigkeit, Schmutztragevermögen, Waschvermögen) von p‐n‐Alkylbenzolsulfonaten in Abhängigkeit von der Länge ihrer Alkylkette untersucht. Grenzflächenaktivität im t…
Received 24 February 1959DOI:https://doi.org/10.1103/PhysRevLett.2.250©1959 American Physical Society
Received 26 February 1959DOI:https://doi.org/10.1103/PhysRevLett.2.254©1959 American Physical Society
As part of a program to correlate X-ray and nuclear magnetic resonance data on the structures of oxy-anions, it was found necessary to re-investigate the crystal structure of kernite. The results of this study indicate that the originally proposed space group and structure
Abstract 1. The reaction between trichlorothiophenol or dienols and SO2 brings about vulcanization of rubber without separation of elemental sulfur. The mechanism of the Peachey process of rubber vulcanization is examined on the basis of concepts of the role of intermediate products of the reaction—free radicals. 2. S…