Materials Literature
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Some consequences of the symmetry change associated with the vanadium dioxide metal-semiconductor transition are derived. A free-energy expansion in the ionic displacements has been used. The effect of a $〈101〉$ zone-edge phonon instability and strain effects have been included. The symmetry arguments have been carrie…
Measurements of the ac and dc resistivity in the temperature range of 77-750\ifmmode^\circ\else\textdegree\fi{}K and of the optical transmission and reflectance have been made on amorphous Ge films of 1000-\AA{} to 7-\ensuremath{\mu} thickness prepared by thermal evaporation. The resistivity of amorphous Ge films at r…
The magnetic field generated by the magnetization has been calculated for films with arbitrarily rough surfaces for the case in which the magnetization is uniform throughout the film. Simple results are obtained on the assumption that the film surface is not too ``ragged,'' i.e., for the case in which the inclination…
The determination of the $k\ensuremath{\approx}0$ longitudinal-optic-mode frequencies and lifetimes from the dielectric [$\ensuremath{\epsilon}(\ensuremath{\omega})$] and inverse dielectric [$\ensuremath{\eta}(\ensuremath{\omega})$] response functions of simple cubic solids is discussed. Experimental results of the te…
A neutron diffraction study has been made on single crystal specimens of α-Mn at 4.4°K, 60°K, and several other temperatures. Five types of magnetic form factor were in turn employed in the analysis. The magnetic structure is described by a single non-collinear configuration throughout the temperature range below T N…
Imidazole single crystal has a highly anisotropic conductivity; the ratio of conductivity in the c and a crystallographic directions is ∼103. In the c crystallographic direction, the hydrogen bonded direction, protonic carriers are discharged as hydrogen at the negative electrode. The limiting conduction process is po…
We have improved the free-volume model for molecular transport in dense fluids, as developed in earlier papers, by taking account of the variable magnitude of the diffusive displacement. The development is carried through in a way which may display more clearly the relation between the free-volume model and the Enskog…
The microarchitecture of gastropod nacre reveals deposition of aragonite in the form of crystal stacks and differs markedly from the characteristic microstructure of pelecypod nacre. The structure permits direct observation of both organic and mineral phases of deposition on a growth surface topography that is ideal f…
Abstract Copolymerization of various monoisocyanates with ethylene oxide was attempted in relation to the alternate copolymerization of phenyl isocyanate with ethylene oxide by triethylaluminum catalyst. It was found that aliphatic and alicyclic isocyanates are not copolymerizable at all while many of aromatic isocyan…
Abstract A differential scanning calorimeter has been used to measure the heat capacity of both melt and solution crystallized samples of isotactic polypropylene from 200 to 500°K. An estimate has been made of heat capacity values below 200°K. Values of the heat capacity, entropy, enthalpy, and free energy have been e…
"The Space Dependence of Reactor Noise-II Calculations." Nuclear Science and Engineering, 39(3), pp. 413–414
Decarboxyschizopelt-Säure liefert bei der Entmethylierung mit Bortribromid Di-O-desmethyl-decarboxyschizopelt-Säure, die eine positive Gibbssche Reaktion zeigt. Daraus folgt für Schizopeltsäure Struktur 1 (1.6-Dimethoxy-3.8-dimethyl-7-methoxycarbonyl-dibenzofuran-4-carbonsäure).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Time on Infrared Spectra of Epoxy PyrolyzatesEugene CerceoCite this: Ind. Eng. Chem. Prod. Res. Dev. 1970, 9, 1, 96–100Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://pubs.acs.org/doi/10.1021…
Raman spectra, with polarizations, are given for a series of B2O3–Bi2O3–Al2O3 glasses in the composition range 0–96 wt% Bi2O3. The spectra of the mixed glasses are different from that of B2O3 except at the lowest Bi2O3 concentration. The low-wavenumber region of the mixed glasses changes in a systematic fashion, with…
The problem of a uniformly moving circular surface load of a general orientation on an elastic half space for two types of load distribution, viz., “uniform” and “hemispherical,” is considered. The solutions have been obtained in integral form. The displacements on the surface of the half space, in the case in which t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic Synthesis of Lactic Acid from Acetaldehyde, Carbon Monoxide, and WaterS. K. Bhattacharyya, S. K. Palit, and A. R. DasCite this: Ind. Eng. Chem. Prod. Res. Dev. 1970, 9, 1, 92–95Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Publ…
The kinetics of burnout of natural organic matter in building clays were investigated. The results indicate that burnout occurs in two stages for extruded bodies. The temperature dependence of the reaction rate during the first stage was the same as that for the diffusivity of an O 2 /CO/CO 2 gas mixture. It is, there…
The absolute thermoelectric power S and the electrical resistivity p of polycrystalline samples were determined between 80°K and 580°K for Cr[sbnd]V alloys with up to 77 at. % V and between 300° and 750°K for Cr[sbnd]Mn alloys with up to 10 at. % Mn respectively. S of all alloys is positive. The resistivity and the th…
Recent advances in the study of microwave ferrites and garnets have resulted in a better understanding of the relationship between magnetic properties and the fundamental crystal structure. This article presents a review of the way in which the crystal structure of microwave garnets may be designed in order to realize…
The EPR spectrum of O2 impurity in solid N2 has been observed at K band and at X band. The results are consistent with the specific-heat results for this system and indicate that the Σ3 state is split in zero field by 105 ± 15 GHz. A small temperature-dependent splitting of the upper doublet is indicated by the result…