Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVesicles of variable diameter prepared by a modified injection methodJ. M. H. Kremer, M. W. Van der Esker, C. Pathmamanoharan, and P. H. WiersemaCite this: Biochemistry 1977, 16, 17, 3932–3935Publication Date (Print):August 23, 1977Publication History Published online1 May 2…
A method for the isolation of an iron-molybdenum cofactor (FeMoCo) from component I of nitrogenase is described. This method is used to isolate FeMoCo from aerobic, anaerobic, facultative, and photosynthetic nitrogen-fixing organisms. The Fe/Mo ratio in the FeMoCo from Azotobacter vinelandii and Clostridium pasteurian…
The In and Sn 3d3/2 and 3d5/2 ESCA peaks and the oxygen 1s peak of Sn-doped In2O3 films were compared with those for In2O3 films and In2O3, SnO, SnO2, and Sn3O4 powders. Comparison of as-grown with sanded surfaces revealed Sn-rich surface layers in.those films having good optical and transport properties. These experi…
Band structures and Fermi surfaces are presented for three quasi-octahedral layer compounds. The dependence of both properties on the component k z of the wavevector normal to the layers is shown to be important particularly in its effect on the formation of charge density waves. Whereas the nesting of the Fermi surfa…
We report measurements of the electrical conductivity, $\ensuremath{\sigma}$, of thin amorphous films of hydrogen tungsten bronze, ${\mathrm{H}}_{x}\mathrm{W}{\mathrm{O}}_{3}$, as a function of temperature and hydrogen/tungsten ratio, $x$. For $x\ensuremath{\lesssim}0.3$ the temperature dependence of $\ensuremath{\sig…
At both the cubic-rhombohedral phase-transition temperature ${T}_{c}$ and the zero-gap temperature ${T}_{b}$, anomalous increases in Raman intensities are observed in ${\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{Sn}}_{x}\mathrm{Te}$ (for $x=0\ensuremath{-}1$) single crystals. These are attributed to Raman scattering enha…
Results on the magnetic-field dependence of the order parameter in a nematic single crystal are reported for the first time: The induced birefringence of a nematic single crystal of 4\ensuremath{'}-$n$-heptyl-4-cyanobiphenyl was found to vary linearly with the magnetic field as predicted by the fluctuation theory.
We show that the linear compound Nb${\mathrm{Se}}_{3}$ becomes superconducting under pressure. We have measured the initial slope of the magnetization of Nb${\mathrm{Se}}_{3}$ as a function of pressure down to temperatures as low as 50 mK. A very small pressure is necessary in order for the superconductivity to occur.…
In pure titanium deformed at room temperature, a broad internal friction peak centred at −102 °C (Pd), a subsidiary peak at −140 °C (P′d) and a small hump at −50 °C (Pα) are observed at 1 Hz. On subsequent annealing, the heights of these peaks decrease monotonously over the temperature range from 50 to 200 °C, and to…
To dope VO2 thin films ion implantation is used and compared with other doping technologies. Argon, boron, and phosphorus are chosen as doping materials. The influence of doping on the resistance—temperatur dependence of the VO2 thin films is measured in different annealing states after implantation. Doping with P-ion…
For monocrystalline V1-xMexO2-y samples (Me = Ga, Al, Fe) the effect of nonstoichiometry (oxygen deficiency) on the electrical, magnetic, and structural properties of Me3±-doped vanadium dioxide is investigated. The influence of acceptor-like defects caused by the Me3± doping is compensated by donor-like defects cause…
A method of analysis of curves for diffraction reflection from crystals with a disturbed surface layer is developed. It allows to determine, directly from experimental data, the integral characteristics of the disturbed layer, such as the thickness of the disturbed layer, Leff, mean change in the interplanar spacings…
In-situ-deformation experiments are made in a high voltage electron microscope. In MgO single crystals the processes governing the dislocation mobility are the overcoming of local obstacles at the screw dislocations and the Peierls mechanism at edge dislocations. The dislocations multiply mainly from edge dislocation…
The phase transition in KH 3 (SeO 3 ) 2 was studied by thermal measurements of specific heat and lattice parameters. The transition entropy estimated experimentally agrees satisfactrily with that calculated by a phenomenological theory in which a latent transition parameter was introduced. Other thermal results are al…
A comparison is made of two versions of the acoustic-mismatch theory of the thermal boundary resistance $R$ which occurs at the interface between a pair of solids. The most recent version predicts $R\ensuremath{\rightarrow}0$ as the two solids become identical, while the earlier version indicates a finite $R$ as the i…
The self-diffusion coefficient D of silver ions in α-Ag 2 Te has been measured by the tracer technique using Ag 110m and the mobility µ of cations is estimated from the ionic conductivity σ. The ratio µ/ D is slightly deviated from the Einstein relation. This deviation is discussed in comparison with a theory appropri…
The McLachlan susceptibility theory is used to calculate the van der Waals–Lifshitz forces betwen two chiral, rodlike dielectric particles embedded in an isotropic dielectric medium. The resulting interparticle potential contains an asymmetric term in φ, the mutual dihedral angle between the major axes of the particle…
The results of an experimental study of nonlinear electrical transport at low temperatures are described for the one-dimensional organic conductors TTF-TCNQ (tetrathiafulvalene-tetracyanoquinodimethane) and TSeF-TCNQ (tetraselenafulvalene-tetracyanoquinodimethane). The $b$-axis conductivity is nonlinear in both compou…
A new spectroscopic technique for imaging the spatial distribution of nonradiative defects in semiconductor materials is presented. The technique combines the versatility and sensitivity of deep-level transient spectroscopy (DLTS) with the capability for defect analysis at high resolution of the scanning transmission…
The static magnetic susceptibility of single crystal MnTe 2 from 4.2 K up to 450 K was measured. The exchange constants J 1 and J 2 are estimated as -7.1 K and +1.3 K, respectively, using the high-temperature power series method. This set of J 1 and J 2 are consistent with the stability region for the 1-st kind AF ord…