Materials Literature
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Grain-boundary self-diffusion measurements over the temperature range 367–444°C have been made in polycrystalline Au using Au195 radioactive tracer and rf backsputtering technique for serial sectioning. The diffusion parameters are Qb = 0.88 eV and δDb0 = 3.1 × 10−10 cm3/sec which are discussed in relation to the poss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of dithiolene complexes with amines. II. Formation and properties of mixed-ligand dithiolene .alpha.-diimine complexes of nickelThomas R. Miller and Ian G. DanceCite this: J. Am. Chem. Soc. 1973, 95, 21, 6970–6979Publication Date (Print):October 1, 1973Publication…
Abstract The critical strain ε c for crazing of polystyrene in each of a variety of organic liquids has been measured along with the degree of swelling of the polymer by the liquid and the attendant reduction in the glass transition temperature T g of the polymer. The critical strain for the crazing in air and the T g…
The intensity and spectral distribution of light scattered by K 2 O‐SiO 2 glasses (K 2 O content up to 40 mol%) were measured. The transverse and longitudinal sound‐wave velocities and the photoelastic constants were evaluated from the results. The total intensity of the scattering (and therefore the attenuation cause…
High-temperature viscous flow data are reported for three relatively simple organic liquids: o-terphenyl, salol, and α-phenyl-o-cresol. The results are combined with previous flow data on the same liquids to obtain viscosity-temperature relations over some 15 orders of magnitude. For each liquid, as well as for tri-α-…
The polymer crystal lamellar growth rate G is an often-measured property of semicrystalline polymers. In this paper, we investigate the dependence of G upon the length of the substrate, L, the surface nucleation rate of new growth layers per unit length per unit time, i, the velocity with which the growth layer covers…
Analytic features of the spectra due to excitation of a core electron in metal with an incomplete shell are studied with a simple model. The incomplete shell (denoted by d state, representatively) is treated as a nondegenerate localized state interacting with conduction band through the s – d mixing. It is assumed tha…
A fracture mechanics approach was used to investigate the high strength of hot‐pressed Si 3 N 4 . Room‐temperature flexural strengths, fracture energies, and elastic moduli were determined for material fabricated from α‐ and β‐phase Si 3 N 4 powders. When the proper powder preparation technique was used, α‐phase powde…
Paint has long been used for the protection of iron and steel against corrosion.
Abstract X-ray diffraction analysis of mixed alkylammonium-exchanged smectite revealed segregation of different ion species into randomly ordered layers. Vermiculite, however, showed segregation into crystallites, a behavior attributed to clay inhomogeneity. Ion segregation is explained by the hydration properties of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectra of thorium(IV) fluoride complex ions in fluoride meltsL. M. Toth and G. E. BoydCite this: J. Phys. Chem. 1973, 77, 22, 2654–2657Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published inissue 1 October 1973https://pubs.ac…
Abstract The Christiansen effect appears in the i.r. spectrum of powders embedded in a solid, liquid or air matrix as an apparently anomalous transmittance (Christiansen peak) of the incident electromagnetic radiations. The peak appears at wavelengths for which the refractive index of the sample and the refractive ind…
The recent development of instrumentation suitable for accurate determination of galvanic currents suggests that more data of this nature will be gathered and reported. It is shown that galvanic current data cannot be an accurate measure of dissolution rates in many cases, since dissolution rates from the galvanic cur…
Abstract The emission spectra of CdSe crystals under the excitation in the region of fundamental absorption with the HeNe laser line λ = 6328 Å have been studied at temperatures 4.2 to 300 °K. A set of narrow emission lines shifted by the energies of an integer number of LO phonons to lower energies from the exciting…
The thickening of polymer crystals during isothermal annealing is usually observed to be an irreversible process. Phenomenological laws that govern such processes take the form of simple proportionalities—flux being proportional to force. For polymer crystals, a thermodynamic force capable of driving the thickening ph…
Abstract The heat capacities of isopropylbenzene were measured with an adiabatic calorimeter for the crystal from 14 to 177.13 K (Tm), for the glassy state from 14 to around 126 K (glass transition temperature: Tg) and for the liquid from Tg to 313 K, with a sample of 99.93% purity. The heat and entropy of fusion were…
A general theory of the spin-dependent phonon Raman scattering in magnetic crystals is developed. The integrated Raman intensity as a function of temperature is expressed as S ( T )=( n 0 +1)| R + M < S 0 · S 1 >| 2 , where the first term represents the spin-independent part and the second one the spin-dependent part…
This paper provides a detailed survey and extension of certain properties of the stable regulator problem: determine\min\inf{u} \int\min{0}\max{\infty} x'Qx + u'u dtsubject to\dot{x} = Fx + Gu; x(0) = x_{0}; \liminf{t \rightarrow \infty} x(t) = 0whereQis not necessarily sign definite. First, equivalence conditions rec…
Data are presented to show that when linear polyethylene is quenched from room temperature to temperatures below 273 K, it exhibits a volume decrease for times long compared with that required to establish temperature equilibrium. The time, temperature, and density dependence of this decrease is shown to be consistent…
Abstract Bohn has compiled a list of polymer pairs on which compatibility studies have been reported. The list contains 13 polymer pairs for which, according to Bohn, compatibility as solids may be considered to be definitely established, at least within some regions of proportions. The approach used here is based on…