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The optical reflection spectra from 12 500 to 50 000 cm—1 were studied for a series of coprecipitated chromia—alumina samples calcined between 500° and 1400°C. The Melamed theory was employed to obtain extinction coefficients from these spectra. The Racah parameter B and the wavenumbers of the two visible transitions…
The well-known equation of Davies and Jones for the pressure dependence of the glass transition temperature, dTg/dP=Δβ/Δα=TgVΔα/ΔCp, depends on two independently testable hypotheses: that a one-parameter description of the excess thermodynamic functions is adequate, and that the glass transition occurs when some one t…
Magnetic susceptibility measurements have been carried out on a wide variety of organic salts based on the anion radical of tetracyanoquinodimethan (TCNQ). A correlation between the magnetic and electrical properties has been observed. Salts which exhibit the higher conductivities also exhibit a temperature-independen…
The dispersion relation for the normal modes of vibration propagating along the [$\ensuremath{\zeta}00$], [$\ensuremath{\zeta}\ensuremath{\zeta}\ensuremath{\zeta}$], and [$0\ensuremath{\zeta}\ensuremath{\zeta}$] directions in a single crystal of pure gallium arsenide at 296\ifmmode^\circ\else\textdegree\fi{}K has been…
The thermoelectric power ($\ensuremath{\alpha}$) of $p$-type SnTe has been measured between room temperature and 450\ifmmode^\circ\else\textdegree\fi{}C for apparent hole concentrations (${p}^{*}=\frac{1}{e{R}_{300}}$) between 1\ifmmode\times\else\texttimes\fi{}${10}^{20}$ and 1.8\ifmmode\times\else\texttimes\fi{}${10…
We determined the viscosity of rhyolite glass at temperatures between 350° and 850°C, water pressures between zero and 68.9 bars, and water content between 0.1 and 3 weight per cent. Our technique was to construct a compaction rate curve for the rhyolite glass under known conditions of temperature, water pressure, and…
The rare-earth ions may exist in the divalent state in suitable host crystals such as CaF2. All of the trivalent ions from Ce to Yb (and probably also La) are reduced in situ to the divalent state in CaF2 by gamma irradiation. The spectra of most of these ions show that the ground and first few excited states derive f…
An analysis of thermal conductivity is presented which differs from that of Klemens and of Callaway in that it considers explicitly the conduction by both transverse and longitudinal phonons. This approach is then used to provide a very good fit to the data on silicon from 1.7 to 1300\ifmmode^\circ\else\textdegree\fi{…
Experiments on clotting, both in vitro and in vivo, showed that a colloidal graphite surface, when rinsed with a cationic, surface-active agent, was capable of bonding heparin. The resistance of this graphite-heparin surface to the formation of clots was far greater than plastic or silicone surfaces in comparable stud…
Copper, shown to be present in significant amounts in monoethanolamine, MEA, scrubber solutions, is an active catalyst for the serious degradation of the amine. Makeup water, drawn from the ship's potable water supply, appears to be a major source of this metal. The recommended substitution of battery-grade for potabl…
A nonlinear differential equation describing the steady-state operation of a current instrument transformer is formulated based upon a Rayleigh hysteresis loop approximation of the magnetic core effects. Using a harmonic-balance technique, a suitable approximate solution of this equation provides expressions for the R…
The high‐temperature energy relations in some alkaline‐earth and lead borate glasses and compounds of the same compositions are reported. The data obtained with a continuous high‐temperature calorimeter and by solution calorimetry in 2 N nitric acid were combined to give heat content versus temperature curves from 25°…
Studies of the physical and chemical forms of I131 fallout following the USSR nuclear tests of late 1961 and the United States and USSR studies of 1962 have shown that the fraction existing in the gaseous state varied from about 10 to 90 per cent. Very little of the gaseous I131 appeared to be in the elemental or HI f…
The relative magnetization of an assembly of fine, ferromagnetic, single-domain particles which show uniaxial magnetic anisotropy has been formulated as a function of ρ and λ, the ratios of magnetic energy of particle moment in field and anisotropy energy to thermal energy, respectively, under various situations for p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHERMOCHEMISTRY OF ANION MIXTURES IN SIMPLE FUSED SALT SYSTEMS. II. SOLUTIONS OF SOME SALTS OF MO4- AND MO4-2 ANIONS IN THE CORRESPONDING ALKALI NITRATESO. J. Kleppa and S. V. MeschelCite this: J. Phys. Chem. 1963, 67, 12, 2750–2753Publication Date (Print):December 1, 1963Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDialkoxyphthalocyaninosilicon Derivatives1aPaul C. Krueger and Malcolm E. KenneyCite this: J. Org. Chem. 1963, 28, 12, 3379–3381Publication Date (Print):December 1, 1963Publication History Published online1 May 2002Published inissue 1 December 1963https://pubs.acs.org/doi/10…
The equation derived by Peierls for the occupation numbers ${N}_{q}$ of phonon states with wave vector q and appropriate polarization is linearized to give a maser equation for the deviations ${n}_{q}\ensuremath{\equiv}{N}_{q}\ensuremath{-}{{N}_{q}}^{0}$ from equilibrium. This master equation, with transition probabil…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE THERMODYNAMIC PROPERTIES OF MAGNESIUM ORTHOPHOSPHATE AND MAGNESIUM PYROPHOSPHATEF. L. Oetting and R. A. McDonaldCite this: J. Phys. Chem. 1963, 67, 12, 2737–2743Publication Date (Print):December 1, 1963Publication History Published online1 May 2002Published inissue 1 Dec…
The electric strength of n -hexane for steady fields (direct strength) is found to increase from 0.7 MV cm -1 to 1.3 MV cm -1 and to become insensitive to electrode material as the amount of dissolved oxygen is increased to an equilibrium partial pressure of 100 mmHg in the vapour phase above the liquid. Greater amoun…
Vapor densities of magnesium-bearing species over magnesium oxide were determined by the transpiration method. The MgO reacted with water vapor present in the carrier gas to form gaseous Mg(OH)2. The standard free energy of formation in calories per mole is given over the temperature range from 1660° to 2010°K by the…