Materials Literature
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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…
Thermal conductivity measurements are used to study phonon scattering by $F$ centers in NaF, KCl, KBr, and KI. $F$ centers were produced by additive coloration and by x and $\ensuremath{\gamma}$ irradiation. The total effect on the thermal conductivity is seen to be different for the two methods of preparation. The ad…
Numerical calculations, based on spin wave theory, have been carried out in connection with the magnetic properties of two simple ferromagnetic salts, EuO and EuS, and the antiferromagnetic compound MnF 2 . The resulting predictions regarding magnetization and specific heat have been compared with experiment over as w…
A neutron diffraction study of polycrystalline HCrO 2 and DCrO2 (chromous acid) is described. Intensity data from the two substances were refined together by the lea~t-squares method, with the constraint that the Cr-O distance be the same in the two substances. Estimates of individual contributions to multiple peaks w…
An empirical description of the shape of optical absorption bands due to localized excitons in ionic crystals is proposed. The new formula links a nearly Gaussian description of the band near its maximum with an exponential description of the band on the low-energy tail (Urbach's rule). The applicability of the propos…
Abstract Poly‐β‐hydroxybutyric acid has been isolated from two bacterial sources by two different procedures. Molecular weight and intrinsic viscosity for the two samples were vastly different. This was blamed on degradation occurring during polymer isolation. An optical rotatory dispersion curve for the high molecula…