Materials Literature
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The retention of hydrogen isotopes in Mo at room temperature after ion implantation damage has been studied by measurements of H depth profiles and total D retained in the near-surface region. Implantations of He, O, Ne, and Bi in a fluence range 3×1014–2×1017/cm2 were followed by 8-keV hydrogen bombardment to fluence…
A report on fabric and garment flammability which represents a synthesis and overview of research conducted by four independent labs, sponsored jointly by the Government Industry Research Committee on Flammable Fabrics and by the Office of Flammable Fabrics of the National Bureau of Standards. It is intended as a refe…
Measurements of DC and AC conductivity and thermopower show that VO 2 : W can be treated as a conventional n-type extrinsic semiconductor with a donor level 0.06–0.08 eV below the conduction band. For samples with an impurity content from 0.67 → 1.70 at.% W, an effective mass ratio m*/m of 65 ± 10 and a compensation r…
The quantum-mechanical single-configurational-coordinate model is used to interpret Y2O2S:Eu+3 and La2O2S:Eu+3 7F→charge-transfer state (CTS) absorption, 5Di→5Di−1 one-step and 5D→CTS→5D two-step quenchings, and CTS→5Di feeding fractions. The preferred fit requires unequal force constants and a small downshifting of t…
The thermoelectric power of a series of isostructural organic charge-transfer salts has been measured. The compounds consist of a tetracyanoquinodimethane (TCNQ) anion with cations of tetrathiafulvalene, cis/trans-diselenadithiafulvalene, and tetraselenafulvalene. The salts are metallic at high temperatures with a sha…
A general expression is obtained for the magnetoresistance tensor of a solid containing a small number of macroscopic inhomogeneities. The result is used to show that a wide variety of inclusions will generate a linear transverse magnetoresistance in a free-electron metal at high fields. Voids or other nonconducting d…
Measurements of the electrical resistivity as a function of temperature have been made on a series of bcc V-Cr solid solutions over the range 285 to 1200\ifmmode^\circ\else\textdegree\fi{}K (and at 4.2\ifmmode^\circ\else\textdegree\fi{}K). The deviations from a linear temperature dependence of the resistivity at tempe…
Phonon dispersion relations in ${\mathrm{Cu}}_{2}$O have been studied at 20\ifmmode^\circ\else\textdegree\fi{}C using inelastic neutron scattering. Seven acoustic branches and twelve optical branches have been studied in detail in the three symmetry directions [$00\ensuremath{\zeta}$], [$\ensuremath{\zeta}\ensuremath{…
We approximate liquid water as a lone-pair amorphous semiconductor. Since electronic orbital times are short compared to the periods of atomic and molecular motion, properties dependent on electronic states can be interpreted to determine short-time intermediate range order. An anomalous temperature dependence of the…
Using molecular dynamics techniques, low temperature properties of a 500-particle amorphous system of Lennard-Jones particles have been studied. The system was prepared by rapid quenching of an originally liquid sample. The structural properties are similar to those of random close-packed hard spheres. Propagating lon…
Vibrational modes of trigonal Se and Te are analyzed to determine the character of the interchain (secondary) forces. The dispersion of low-frequency modes clearly demonstrates the directional (covalent) character of these forces. The interference of secondary interactions with the intrachain (primary) bonding is evid…
The authors have calculated defect energies for MgO using both a simple central-force shell model and the central-force breathing shell model proposed by Sangster (1973). Such an extension is required to account for the large Cauchy violation C 44 >>C 12 found for this material. A critical comparison has been made of…
Abstract A series of resol‐type phenol‐formaldehyde resins was investigated by infrared spectroscopy and differential scanning calorimetry. The molar ratio of phenol to formaldehyde was determined from the absorbance ratio D 1010 /D 1610 . Differences between the reactivities of resins were confirmed by the molar phen…
Synthetic titanomagnetites ((1−x)Fe3O4, - xFe2TiO4, 0 ≤ × ≤ 0.6) were prepared by the ceramic oxide method and the equilibrium atmosphere method, and two size fractions were separated out. The first contained particles of size >150 μm, while the second, which was ground in a water slurry, had a mean particle size of a…
Abstract In early 1969 I was invited by the then Minister of Technology to be Chairman of a committee to investigate and assess the cost per annum in the U. K. of corrosion and the means available for its alleviation. We had the services of a small secretariat seconded from the United Kingdom Atomic Energy Authority,…
Transient hole transport in $a$-Se below 180 K is shown to be a stochastic process. The transition from the well-defined high-temperature transport with Gaussian dispersion to the low-temperature stochastic transport is not paralleled by a change in the activation energy of the hole drift velocity.
<div class="htmlview paragraph">The effect of combustion time and combustion variability on performance and emissions was investigated with a single cylinder CFR spark ignition engine using gaseous fuel (propane). A system was developed which allowed the collection of the products of combustion of individual eng…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of 2,2,4,4-tetraphenyloxetan-3-one. Intermediates in the photofragmentation of aryl substituted oxiranesJ. P. Wasacz, M. M. Joullie, U. Mende, I. Fuss, and G. W. GriffinCite this: J. Org. Chem. 1976, 41, 3, 572–574Publication Date (Print):February 1, 1976Publi…
An energy analyser of the uniform magnetic sector type has been built for a 100 kV conventional transmission electron microscope (CTEM), which is equipped with a scanning transmission (STEM) attachment. The analyser has an energy resolution of 2.5 eV and does not degrade the STEM spatial resolution. It is intended pri…
Article Changes of Excess Free Energies in the Crystal Growth Processes of Calcite and Aragonite Due to the Presence of Mg2+ Ions in Solution was published on February 1, 1976 in the journal Zeitschrift für Physikalische Chemie (volume 99, issue 4-6).