Materials Literature
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Resistivities of evaporated or sputtered polycrystalline and epitaxially grown single-crystal gold films of thickness 100–1000 Å have been measured in situ during deposition. Single-crystal gold films have been grown epitaxially on cleaved mica by sputtering and, as indicated by electron diffraction studies, are atomi…
A system employing a mass spectrometer as a continuous flow gauge has been used to study the oxygen evolved from aluminum-coated glass as a result of electron bombardment. The outgassing from most glasses is found to fit the empirical equation Q=Q∞(1-exp-t/K). In this equation Q is the sum of the oxygen released durin…
Abst~nde benachbarter Bromatome zweier Molekiile,
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Determining the approximate crushing stress of hexagonal cell structures subject to axial loading
A descriptive classification of cross‐stratified units is proposed based on six objective criteria, and diagnoses are given for fifteen distinct kinds of cross‐stratified unit recognised with their aid. The origin of each kind is discussed in the light of existing observational, experimental, and theoretical studies.…
The thermal diffusivity of pure silicon has been measured from 300 to 1400\ifmmode^\circ\else\textdegree\fi{}K. The specific heat of the same material over the same temperature range has been measured by Dennison. The thermal conductivity was obtained from the product of the thermal diffusivity, specific heat, and den…
Abstract Several methods of measuring the unsaturation remaining in natural rubber after cyclization have been compared. Approximate agreem ent was obtained with the reagents, perbenzoic acid, phenyl iododichloride and ozone; iodine chloride gave high values. Perbenzoicacid is considered the most satisfactory of these…
The electrical resistance of single crystal graphite shows a very sharp increase at above 150 kilobars, accompanied by a drifting upward with time. The behavior is typical of a first-order phase transition, and is irreversible. X-rays on the material after removal from the cell show lines of a new material with a stru…
A theoretical estimate of the polarizabilities of ions in the alkali halides is made by means of a procedure based upon the product approximation which distinguishes the ionic constituents in the crystals but allows for their overlap and mutual interaction. Analysis by means of the Thomas-Kuhn sum rule is used allowin…
Below 1.2\ifmmode^\circ\else\textdegree\fi{}K, the specific heat of natural Madagascar graphite is: $C=13.8T+27.7{T}^{3}$ \ensuremath{\mu}J/mole deg. The coefficient of the linear term agrees well with theoretical calculations of the electronic specific heat of a pure single crystal of graphite. The ${T}^{3}$ term yie…
This paper describes an experimental and theoretical examination of a 10-\ensuremath{\mu}g $c$-axis-oriented single crystal of MnAs. The critical magnetic field for the first-order transition to the ferromagnetic phase has been measured as a function of temperature (15 to 65\ifmmode^\circ\else\textdegree\fi{}C) and pr…
The crystal structures of the isomorphous garnet-red copper salts, KCuCl3 and NH4CuCl3, have been determined. Each compound contains discrete, planar, Cu2Cl6= dimers. These dimers are stacked above each other along the crystallographic a axis. The cation exhibits a ninefold coordination. KCuCl3 is antiferromagnetic be…
An apparatus for tensile testing in vacuum to 5400°F is described. A load-elongation curve is plotted during testing of a standard specimen at a selected nominal strain rate between 0.005 and 5.0 in./in./min. The load train design provides that the grips, as well as the specimen, are in the furnace hot zone. The speci…
The methods commonly used in making buckling, critical loading, and cell parameter measuremerts are reviewed, and the results of such measurements are summarized. Only simple uniform and multiregion lattice experiments are considered. The experimental work done at each of the laboratories involved is summarized. The m…