Materials Literature
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In Al-1·7 at. % Cu the critical resolved shear stresses, tension stress-strain curves, and the dependence of the flow stress on strain rate were determined from 4·2 to 273 or 373°K for the following structures: supersaturated α solid solution, α + GP I, α + GP II, α+ θ′, and α+θ. The difference between the CRSS at 4·2…
The photoionization of Ce3+ is investigated by determining the optical absorption changes and the electron spin resonance changes that occur when cerium-containing silicate glasses are illuminated with ultraviolet light. The results are: (1) The room temperature quantum yield of photoelectrons from Ce3+ is 0.1. (2) Th…
The electrical conductivity of nickel oxide has been studied at temperatures between 600° and 1350°C and partial pressures of oxygen between 1 atm and 10−4 atm. The slope of log conductivity vs reciprocal temperature plots increases when the temperature is high enough for the sample to come into thermodynamic equilibr…
Abstract Various theories accounting for the existence of a front factor in the equation of state for rubber elasticity are reviwed. It is shown that a front factor which may be different from unity exists whether or not intramolecular energy effects are present. A unified theory is presented which is applicable both…
Abstract The nonisothermal method of Freeman and Carroll is used to investigate the kinetics of the thermal degradation of polyethylene and polystyrene. The reactions were studied thermogravimetrically under a vacuum of 1 mm Hg. Decomposition appears to occur in stages. The rate parameters were determined for each reg…
The theory of sound attenuation in structurally perfect dielectric crystals is extended and applied to recent experiments on the absorption of acoustic waves in crystalline quartz at frequencies from ${10}^{9}$ cps to 2.4\ifmmode\times\else\texttimes\fi{}${10}^{10}$ cps. The sound wave is assumed to vary the frequenci…
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The Hall effect, thermoelectric power, and electrical conductivity have been measured as a function of temperature in crystals of $p$-type titanium sesquioxide. A transition is observed at about 450\ifmmode^\circ\else\textdegree\fi{}K. Below this temperature the crystals behave like semiconductors, while above it the…
Diffusion fronts in samples containing grain boundaries are spike shaped. Velocity of spike advance and angle between spike and boundary are measured. The "spike-velocity method" of analysis permits evaluation of two effective widths, ${W}_{D}$ and ${W}_{0}$, which describe the diffusion properties of the boundary. Th…
The lattice vibration spectrum of a solid can be characterized by one single frequency, which is defined as "the frequency of the center of gravity" of this spectrum or simply "center frequency." From its equality with the characteristic frequency of specific heat we have recently derived the "center law of the lattic…