Materials Literature
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The experimental information relevant to the band structure of the compounds InSb, InAs, GaSb, GaAs, GaP, AlSb and some of their alloys is synthesized and interpreted in terms of a consistent theoretical picture which exploits the close relationship linking the band structures of the group 4 and 3–5 semiconductors. It…
This paper reviews the work which has been carried out in these Laboratories during the past two years on single crystals of bismuth telluride and its alloys. The combination of experiments on Faraday rotation with those performed previously on galvanomagnetic effects has established that there are 3- and 6-valley ban…
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1961.
The conditions necessary in metals for the presence or absence of localized moments on solute ions containing inner shell electrons are analyzed. A self-consistent Hartree-Fock treatment shows that there is a sharp transition between the magnetic state and the nonmagnetic state, depending on the density of states of f…
Abstract The systematic pleating of polymer molecules in their crystallization, in segments of a length of the order of 100 A, which depends on the crystallization temperature, is interpreted in terms of the kinetics of crystal growth. The theory begins with but departs from a theory proposed by Lauritzen & Hoffma…
Radiofrequency waves at 15 and 45 Mc are transduced into pressure waves at the same frequencies, and are applied to a CdS crystal. The waves are then converted by a second transducer into a r-f output wave. The signal amplification is found as a function of the illumination intensity on the crystal, and the electric f…
Abstract The dynamical theory of electron diffraction is developed in a form suitable for the computation of images of crystal lattice defects such as dislocations observed by transmission electron microscopy. As shown in a previous kinematical theory, the contrast arises because the waves diffracted by atoms near the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCOMPLEXES OF IRON WITH d-TARTARIC AND meso-TARTARIC ACIDSR. W. Green and Gwenda M. ParkinsCite this: J. Phys. Chem. 1961, 65, 9, 1658–1659Publication Date (Print):September 1, 1961Publication History Published online1 May 2002Published inissue 1 September 1961https://doi.org…
Abstract The changes in the molecular weight distribution accompanying the thermal depolymerization of poly‐α‐methylstyrene have been investigated. The original polymer, produced by anionic catalysis, had a narrow distribution of molecular weights, which facilitated measurement of the changes. The depolymerization whe…
Summary Specimens of kaolinite have been found in inclusions in the ferruginous deposits on the Yorkshire Coast, just north of Scalby. The excellent quality of the X-ray powder pattern suggests that this kaolinite is better crystalline than kaolinites from other localities. Although the lattice constants of the Scalby…
Contact angles, and adherence of sodium disilicate glasses with varying iron oxide additions on platinum and iron were studied at 1000°C. in vacuum. In the glass‐platinum systems the iron concentration in the glass did not affect either the contact angle or the adherence. No devitrification occurred in the glass‐plati…
The carrier spin-resonance line of neutron-irradiated single crystals of graphite at 300\ifmmode^\circ\else\textdegree\fi{}K has been observed as a function of the thermal neutron flux up to a dose of 9.6\ifmmode\times\else\texttimes\fi{}${10}^{18}$ nvt. From the intensity increase and the $g$ shift for $H$ parallel t…
The bipolar output of the rf phase detector of the receiver in a nuclear magnetic resonance pulse experiment is fed through a 4-diode sampling switch to an RC integrator, whose output is read by a recording electrometer. The switch (a ``transmission gate'') includes two type 7266 ceramic thermionic diodes, whose back…
Abstract Vanadinhexacarbonyl erweist sich als besonders reaktionsfähig. Reaktionen mit N‐Basen (B) in Benzol verlaufen bereits bei Raumtemperatur im Sinne einer „Basenreaktion”︁ unter Bildung von Hexacarbonylvanadaten, [VBn] [V(CO)6]2 (n = 4 oder 6). Auch schwache Basen wie Säurenitrile und O‐Basen geben Verbindungen…
In a hydrogen atmosphere, MgO was vaporized by heating MgO (periclase) in the range 1500° to 1900° C, and the vapor products diffused into Al 2 O 3 (sapphire) to form a uniform outer layer of spinel on all surfaces. At 1900°C. a spinel layer 48 mils thick could be obtained in 16 hours. The rates of spinel formation we…
The synthesis (as opposed to analysis) of multilayer dielectric films as antireflection coatings over any specified frequency band has not been attempted before. The similarity with transmission lines, which can be synthesized as multisection quarter-wave transformers to minimize reflection over any prescribed frequen…
Landells and Whewell have previously reported that vinyl monomers are polymerized “within viscose filaments” by hydrogen peroxide in the presence of ferrous salts and the polymers are not extractable. Such products, obtained by polymerization of acrylonitrile and styrene in viscose, have now been acetylated. Fractiona…
Cell wall preparations from the leaves of Eucalyptus globulus Labill. may absorb water equal to approximately 150% of their dry weight.
Abstract Carbon black, the most important reinforcing filler for rubber, must be well dispersed if it is to function effectively. The state of dispersion of the carbon black can be studied effectively by microscopic examination of a thin (2µ) section of the rubber compound, using transmitted light, as described by Tid…
The previously made absorption-band assignment (1) for the C=S stretching mode in xanthate-type compounds, 1020–1070 cm −1 , has been confirmed by the characteristic behavior of the C=S dipole in a range of different solvents (Bellamy and Rogasch (2)).