Materials Literature
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Refinement of the crystal structure of V${\mathrm{O}}_{2}$ at 360 and 470 K in the metallic rutile phase shows that both the vanadium and oxygen thermal displacements are larger than those found in rutile phases of Ti${\mathrm{O}}_{2}$ and Cr${\mathrm{O}}_{2}$ or monoclinic phases of V${\mathrm{O}}_{2}$ or ${\mathrm{V…
The electronic structure of an isolated TCNQ mulecule has been calculated by the self-consistent statistical-exchange multiple-scattering method. By using overlapping atomic spheres in place of nonoverlapping atomic spheres, a significant increase in physical realism has been achieved. The theoretical model provides a…
An experimental study of the occurrence of temperature oscillations in molten gallium contained in a rectangular boat and heated from the side is reported. The dependence of the critical temperature difference across the boat for which oscillations set in upon the boat dimensions and upon the strength of a transverse…
The validity of a four-parameter semi-quantum (FPSQ) model to fit infrared reflectivity spectra of crystals having a large number of phonon branches is discussed in view of the results of anharmonic quantum theories. The form of the quantum damping function may indeed be simplified when the two-phonon density of state…
Suspension and bulk-polymerized commercial polystyrenes have been fractured by cleavage and the resulting surfaces examined by optical and scanning electron microscopy. The method of styrene polymerization was found to influence the initiation and propagation of fracture, probably owing to the differing amounts of ins…
Abstract The clay mineral halloysite has been identified in some very old soils of the Wright and Taylor Valleys, Antarctica. Traces of pumice were also detected in these soils. It is considered that the halloysite was formed by weathering of volcanic ash that was deposited in the Wright and Taylor Valleys more than 3…
A phenomenological model has been proposed for the resonant scattering of phonons due to magnetic impurities. The expression for the defect relaxation rate, which also includes Rayleigh scattering of phonons, is of the form ${\ensuremath{\tau}}_{\mathrm{defect}}^{\ensuremath{-}1}={A}_{\mathrm{defect}}{\ensuremath{\ome…
The comparisons between the electronic computer data and the experimental results of the characteristics of a three-anode accelerating lens system for field emission scanning electron microscopy (FESEM) are described. Experimentally two characteristics were obtained. One of them is the relation between the acceleratin…
Abstract Two commercial sealing alloys (Kovar® and Ceramvar® were tested in high pressure hydrogen, or after exposure to hydrogen gas for up to 17,500 h. All hydrogen pressures were 69 MPa. In no case was any ductility loss observed. It was therefore concluded that these alloys are probably safe for use in gas handlin…
Abstract The maximum at 220 nm in the circular dichroism spectrum of native collagen solution changed to a negative value after heat denaturation or collagenase hydrolysis. The enzyme induced rate of CD change at 220 nm was shown to be first order in collagen concentration. The specific rate constant k is actually a c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlash photolysis of potassium tris(oxalato)cobaltate(III)L. Cordemans, J. Olieslager, J. Hendrix, and S. De JaegereCite this: J. Phys. Chem. 1974, 78, 14, 1361–1367Publication Date (Print):July 1, 1974Publication History Published online1 May 2002Published inissue 1 July 197…
Abstract Thin films of poly(ethyl acrylate) and poly( n ‐butyl acrylate) were decomposed in vacuo by means of a high pressure Hg lamp, and the rate of development of volatile products was measured. The main gaseous products were CO, CO 2 , and the alcohol, aldehyde, alkane, and formate derived from the respective este…
Abstract Bi2(SO4)3 begins to decompose at 465°C, and the decomposition process of Bi2(SO4)3 can be represented as follows: Bi2(SO4)3\xrightarrow465°CBi2O3·2Bi2(SO4)3\xrightarrow550°C2Bi2O3·Bi2(SO4)3\xrightarrow580°C7Bi2O3·2Bi2(SO4)3\xrightarrow830°C12Bi2O3·Bi2(SO4)3\xrightarrow880°C28Bi2O3·Bi2(SO4)3\xrightarrow920°CBi…
The characteristic ferroelectric dispersion of the dielectric constant of AgNa(NO 2 ) 2 is measured near the ferroelectric phase transition. In accordance with other works an extremely slow relaxation is observed which can be related to a thermally activated motion of the electrical dipoles. The nuclear spin lattice r…
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The resistance change along a ring, prepared by photoetching a thin flat film evaporated on a glass substrate, is analized and the resistivity anisotropy is separated from the effect of thickness gradient. It is found that in thin films of 84.5% Ni-Fe the resistivity anisotropy coefficient β, defined as β=(ρ // -ρ ⊥ )…
Iridium is used extensively as a material for crucibles containing oxide melts during single crystal growth because of good chemical compatibility with them in slightly oxidising atmospheres. With care, iridium crucibles can be used in this way for long periods.
Rubbing surfaces of critical components for the coming generation of the nation's liquid–metal-cooled fast-breeder reactors must withstand severe environments of high temperature, liquid–metal corrosion, and nuclear irradiation. For some component requirements, the use of the better known bearing materials and hardfac…
Abstract The thermal degradation of several halogen-containing polymers in air was studied by means of the TBA(Torsional Braid Analysis) method and IR spectroscopy. The samples were poly(vinyl chloride)(PVC), vinylidene chloride-vinyl chloride copolymer(PVdC-VC), poly(vinyl fluoride)(PVF), poly(vinylidene fluoride)(PV…
A small depression (about 80 Å) was observed when As–S thin films were exposed to a xenon 500-W lamp. The depression is considered to be a structural change in amorphous As–S.