Materials Literature
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Tapered copper single crystals oriented for single slip are deformed plastically at room temperature and at 77 K. TEM investigations at resolved shear stress levels of 20, 30, and 40 MPa in the same crystal are used to follow the development of the dislocation structure with increasing deformation. Both, an open cell…
We report results of electrical-conductivity, thermoelectric-power, and optical experiments on single crystals of ${\mathrm{Ni}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{S}}_{2}$ ($0\ensuremath{\le}x\ensuremath{\le}0.12$). The results cannot be explained by means of a conventional one-electron model. However, if it…
A chemical vapor deposition system for the growth of epitaxial (112̄0) ZnO films on (011̄2) sapphire, employing the reaction of zinc vapor and carbon dioxide, was investigated. Growth rates as high as 30 μm/h at a substrate temperature of 700-750 °C were achieved. Films grown on substrates with thin presputtered layer…
Infrared absorption of O${\mathrm{H}}^{\ensuremath{-}}$, O${\mathrm{D}}^{\ensuremath{-}}$, and O${\mathrm{T}}^{\ensuremath{-}}$ in $\ensuremath{\alpha}$-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ at 77 K occurs at energies of 3282, 2439, and 2069 ${\mathrm{cm}}^{\ensuremath{-}1}$, respectively. A small band at 3266 ${\math…
We report an investigation of the uniaxial-stress dependence of the first-order Raman spectrum of rutile (Ti${\mathrm{O}}_{2}$). We find a normal-mode behavior, characterized by an increase in the phonon frequency versus uniaxial compression, for the two Raman modes ${\ensuremath{\Gamma}}_{1}$ (${A}_{1g}$) and ${\ensu…
The energies of the core levels and of the Auger peaks have been measured for the Pt-SrTi${\mathrm{O}}_{3}$(100) interface with different coverages of platinum. By comparing the core level and Auger chemical shifts for Pt, the changes in the total relaxation energy was obtained with different coverages of platinum. Th…
Hard diamondlike carbon layers have been deposited on silicon by rf plasma deposition using acetylene as working gas. For the first time the dependence of the sliding friction coefficient μ on the water vapor content of a nitrogen atmosphere was measured. An increase of μ with increasing humidity has been found, with…
Small unilamellar neutral, negatively and positively charged liposomes composed of egg phosphatidylcholine, various amounts of cholesterol and, when appropriate, phosphatidic acid or stearylamine and containing 6-carboxyfluorescein were injected into mice, incubated with mouse whole blood, plasma or serum or stored at…
A variety of 'Universal Yield Curves' for the secondary emission process have been proposed. A series of precise measurements of the secondary emission properties of a range of related amorphous semiconducting materials, made under UHV on freshly vacuum-cleaved surfaces, and covering a wide range of primary energies,…
The dependence of the resistivity of various spinel ferrites upon firing temperature has been studied. It has been determined that the resistivity of spinel ferrites has a maximum, which occurs in samples fired at 1300 degrees C. From impurity doping, the conduction in spinel ferrites can be classified into two types,…
Capillary shear flow of a magnetically aligned liquid crystal was studied in the three Miesowicz orientations in the nematic, the smectic-$A$ and, for the first time, in the reentrant nematic phase. These results indicate that the flow behavior of the reentrant nematic phase is essentially identical to that of the nem…
The thermal resistivity r(T) of ice Ih has been re-measured from 120K to as close as practicable to melting. Measurements were made under isobaric conditions at a pressure of 0.07 GPa, and corrected to isochoric conditions. The resultant deviation from the simple theoretical prediction, r/T=constant, has been plausibl…
The redox process of Co +z ions (z=2,3) substituted into the sapphire alpha -Al 2 O 3 structure produced by heat treatment in H 2 and O 2 atmosphere is correlated with ESR and ENDOR spectra of (Co +2 , H ) ) and with UV-VIS and IR spectra of Co +3 : alpha -Al 2 O 3 and (Co +2 , H + ): alpha -Al 2 O 3 respectively. Fro…
An economical way of using the Lanczos algorithm on the very large sparse matrices associated with absorption band-shape calculations in dynamic Jahn-Teller and similar systems is described, and the sources of error are identified and discussed. Band shapes are calculated for a two-mode E(X)( epsilon 1 (+) epsilon 2 )…
By representing f orbitals by cubic harmonics, overlap (or energy) integrals for f electrons have been calculated in terms of two-centre integrals. Results of s-f, p-f, d-f and f-f integrals are useful in making the tight-binding calculation as an interpolation method for substances with rare-earth or actinide element…
<div class="htmlview paragraph">The three-way catalyst system using a carburetor still needs a lot of improvement for meeting emission standards of U.S. for 1981, California for 1983, and Japanese for 1978. In order to improve air fuel ratio control capability of a carburetor three-way catalyst system, Toyota ha…
<div class="htmlview paragraph">A powder fed, microprocessor controlled plasma transferred arc (PTA) hard facing technique is described for facing valve seats. A comparison of this technique is made with the conventional oxy-acetylene flame welding process to show the differences in the metallurgical characteris…
The optimization of a heterogeneously catalyzed gas‐phase reaction by PE spectroscopy is demonstrated for the production of F 3 CBr, an extinguishing agent used in automatic fire extinguishing installations. A specially developed (PE spectroscopic) gas‐analysis technique permits screening of catalysts (and conditions)…
Abstract The reaction of cellulose phosphonate and N ‐vinyl‐2‐pyrrolidone in ethanol in the presence of sodium ethoxide was investigated and thermal stabilities and flame‐retardant properties for cellulose phosphonate modified with N ‐vinyl‐2‐pyrrolidone were discussed. The results in this study point out the followin…
Abstract An equilibrium isotherm on V‐S system at 900°C was determined by changing partial pressure of sulfur. Single crystals of several V 5 S 8 and V 2 S 3 compounds were grown by chemical transport. The grown crystals almost satisfied compositional relation on equilibrium isotherms between 900°C (hot zone) and lowe…