Materials Literature
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It was reasoned that in normal ferroelastic crystals, if their prototypic (or peraelastic) phase transitions are of the second kind, the dependence of the spontaneous strain on temperature T should be proportional to ( T c - T ) 1/2 right below the transition temperature T c and the T dependence of the elastic complia…
The homogeneous composition range and magnetic properties of the hexagonal Laves-Phase compound, CO 2+ x Ti 1- x ( x >0), have been determined by X-ray diffraction and magnetic studies. X-ray diffraction studies show that the MgNi 2 -type structure is stable in a narrow composition range from about 29 to 31.3 at.% Ti…
The Hall effect and resistivity have been measured as a function of temperature for lightly Zn-doped GaAs of better quality than previously available. Analysis of the Hall coefficient data yields activation energies which change with doping level. These results, along with earlier results on more heavily doped samples…
Vapor deposition simulation programs have been developed using Monte Carlo methods to determine the molecular dynamics of condensation, evaporation, and migration on the lattice. The simulation methods employed in the programs are developed in detail. The principle application will be to systems that permit a comparis…
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…