Materials Literature
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A technique is presented for the simultaneous determination of thermal conductivity and thermal diffusivity of biomaterials. Measurements are derived from the transient power supplied to a thermistor probe operated in a self-heated mode. The thermal properties are extracted through the use of an appropriate thermal mo…
The whole-pattern least-squares fitting method (herein called the pattern-fitting structure-refinement, PFSR, method) developed by Rietveld and used by many with neutron powder data has been extended for use with X-ray powder diffractometer data. Examples of PFSR for specimens in five different space groups are given.…
Lithium ion conductivity in solid solutions formed between and has been measured as a function of temperature and composition using a‐c techniques. Highest conductivities were found at 50 and 60 mole percent (m/o) phosphate. Empirical conductivity parameters are presented and qualitatively analyzed in terms of structu…
A lattice dislocation may lower its elastic energy by dissociation in a high angle grain boundary. The absorption process involves the separation of the product grain boundary dislocations at a rate limited in general by climb and their interaction with any pre-existing network. This description of the absorption proc…
Pd and Pt clusters on carbon substrates have been studied by x-ray photoemission spectroscopy (XPS). Variations in valence- and core-level spectra with cluster size have been observed. Single-atom centers appear to exist in the ${d}^{9}{s}^{1}$ configuration. The $d$-electron count increases with cluster size, and in…
A completely general theory is presented which can be used to describe both anion and cation adsorption on amphoteric oxide surfaces. It takes account of the fact that both the surfaces and adsorbing species are charged and that the surfaces change their charge when ionic adsorption takes place. The theory is applicab…
Deuterium permeation, diffusion, and solubility measurements have been made for several types of vitreous silica at temperatures ranging from 0 to 800 °C. The activation energies for permeation and diffusion were found to be somewhat temperature dependent. Isotope exchange between structural hydroxyl and the diffusing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of .alpha.- and .beta.-enneatungstosilicates and -germanatesGilbert. Herve and Andre. TezeCite this: Inorg. Chem. 1977, 16, 8, 2115–2117Publication Date (Print):August 1, 1977Publication History Published online1 May 2002Published inissue 1 August 1977https://pubs.acs.…
Zinc oxide ceramics containing rare earth metal oxide and cobalt oxide which exhibit non-ohmic current-voltage characteristics were studied. The nonlinearity was similar to that of the zinc oxide varistor containing Bi 2 O 3 and other additives. According to microstructural observations, the intergranular layer of the…
A theory for inelastic scattering of fast electrons in solids is developed, based on an extension of the theory of scattering in an electron gas. Values of the inverse mean free path and related optical potential can be computed quite conveniently. It appears that, particularly in the case of solids characterized by h…
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…