Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract The tensile stress at break (σ b ) and the associated ultimate strain (ϵ b ) of an elastomer depend on (1) the chemical and topological characteristics of the polymeric network, and (2) the test conditions under which rupture is observed. To separate these effects, the ultimate tensile properties can often be…
The effect of a uniform magnetic field on the mechanism, kinetics, and resulting morphology of a spinodally decomposing alloy is investigated. It is shown that the magnetic field is most effective in forming uniformly spaced rods parallel to the magnetization if the aging is carried out just below the intersection (on…
The viscosity of supercooled water has been measured, using a capillary flow technique, down to -23.8 °C. The large supercooling was obtained by removing nearly all suspended particles from the water by an ion exchange column. These results agree with those obtained by White and Twining in 1914, who obtained results d…
Not available
Not available
Not available
Not available
Not available
The electron spin resonance absorption and electrical resistivity have been measured under rigorous conditions for a series of polypyrroles prepared over the temperature range 120-500°. When plotted as a function of pyrolysis temperature the resistivity shows a maximum in the region 200-300°. Although the resistivity…
The pyrolysis of tetraiodopyrrole in an inert atmosphere at temperatures from 120-700° yields black, infusible, amorphous polymers insoluble in solvents. Depending on the pyrolysis temperature, iodine may be present in the polymers as iodine of substitution and as chemisorbed molecular iodine, which is very tenaciousl…
Viscosities of synthetically hydrated obsidians have been measured by the falling-sphere technique at two values of the H2O content. At 4.3 per cent H2O, by weight, the common logarithm of the viscosity in poises ranges from 6.51 at 800°C to 5.88 at 900°C, and at 6.2 per cent H2O from 6.54 at 700°C to 5.25 at 850°C. T…
The frequency-dependent complex dielectric constant $\ensuremath{\epsilon}(\ensuremath{\omega})={\ensuremath{\epsilon}}_{1}+i{\ensuremath{\epsilon}}_{2}$ and associated functions are derived in the range 0 to 22 eV by application of the Kramers-Kronig relations to existing reflectance data for clean Al surfaces. The r…
The oxidation of molybdenum and tungsten was investigated mass spectrometrically at temperatures between 1500° and 2600°K and oxygen pressures between 10—4 and 10—2 Torr. The principal products of oxidation were found to be the gaseous dioxide and trioxide, MO2(g) and MO3(g) (M=Mo or W). The trioxide is the more impor…
The vapor above heated lithium oxide (Li2O) has been investigated mass spectrometrically and by infrared matrix-isolation spectroscopy. The vapor composition and Knudsen effusion rates were measured as functions of temperature, and the matrix spectra of the principal lithium oxide species—Li2O, LiO, Li2O2—identified a…
Received 30 September 1963DOI:https://doi.org/10.1103/PhysRevLett.11.458©1963 American Physical Society
The small signal dielectric coefficient of triglycine sulfate (TGS) and K${\mathrm{D}}_{2}$P${\mathrm{O}}_{4}$ has been determined as a function of frequency, temperature, and dc bias field in both the ferro- and paraelectric regions. The data for TGS are found to agree with a heuristic model involving a Gaussian dist…
We have measured the near infrared absorption, Zeeman effect, and electron spin resonance of ${\mathrm{Cu}}^{2+}$ ions introduced as a substitutional impurity into single-crystal ZnO. From the $g$ values of the lowest ${\ensuremath{\Gamma}}_{6}$ component of the ${T}_{2}$ state (the ground state), ${g}_{\mathrm{II}}=0…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation John L. Kropp, Maurice W. Windsor; Enhancement of Fluorescence Yield of Rare‐Earth Ions by Heavy…
Room-temperature reflectivity measurements in the wavelength range 1 to 140 \ensuremath{\mu} have been made on corundum and ruby. Classical oscillator analysis of the data shows that the optical lattice modes with dipole moment vibrating perpendicular to the $C$ axis occur at 15.7, 17.6, 22.6, 26.0 \ensuremath{\mu}. T…