Materials Literature
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To account for spherulitic crystallization from the melt, one must explain the origins (i) of fibrous crystal habits in the absence of appreciable temperature gradients and (ii) of profuse noncrystallographic branching. Attention is drawn to properties held in common by spherulite-forming melts of various types and, i…
Cross-linking is a process of considerabie commercial as well as biological importance. It gives useful properties to a wide variety of polymers; some, such as rubber would be almost useless if it did not occur. The facilitate of cross-linking for commercnai purposes, however, usually entails the use of heat or certai…
A series of small cation molybdates, MgMoO(4), MnMoO(4), FeMoO(4), CoMoO(4), NiMoO(4), and ZnMoO(4) with the wolframite structure characteristic of the corresponding tungstates have been synthesized at high pressure and temperature. The high-pressure compounds revert to the ambient pressure modifications if heated in…
Abstract An earlier paper (Bowden & Chadderton 1962) has described the damage produced by uranium fission fragments in the lattices of stable crystals. There is evidence that the lattice disarray is caused by both displacement and ionization processes. This paper deals with damage in thermally unstable crystals. T…
The temperature dependence of the cation-distribution parameter η, the lattice constant a, and the oxygen-position parameter u, for Mg1.06Fe1.94O3.97 has been established for quench temperatures between 410° and 1100°C. The fraction of magnesium ions on tetrahedral sites, η, increases from 0.12 to 0.28 in this tempera…
The vaporization of lithium and sodium metaborate has been studied mass spectrometrically. The vapors of these compounds consist principally of the monomers LiBO2 and NaBO2, with some dimer and a very small amount of trimer also present. Heats of vaporization of the two metaborates and of boron oxide were determined w…
The dynamic behavior of oxygen vacancies associated with the solid solution of CaO in Th${\mathrm{O}}_{2}$ is treated using an 8-position nearest neighbor model. This treatment predicts an internal friction peak characterized by a single relaxation time and a dielectric loss peak with a single relaxation time equal to…
The vapor pressures of lithium oxide, boric oxide, and lithium metaborate have been measured by the torsion—effusion method. For lithium oxide, the magnitude of the observed pressure indicates vaporization largely to lithium oxide molecules. The boric oxide measurements yield an entropy for B2O3(g) that is consistent…
The 1s, 2s, 2p, and the four equivalent 3d hydrogen-atom wavefunctions were expanded as linear combinations of functions of the form, exp ( —ar2), without the use of spherical harmonic functions to give angular dependence. The Gaussian functions were located at different points in space in order to give the proper orb…
A regular domain pattern has been observed to form in nematic liquid crystals when an electric field is applied. The domains are visible in unpolarized light by either transmission or reflection. Both ac and dc fields produce similar domain patterns and these appear at a rather sharp threshold field of about 1000 V/cm…
Extensive deposits of kaolinite in Florida are formed by transformation of montmorillonite during low-temperature supergene weathering. The transformation occurs by intracrystalline leaching of interlayer cations and tetrahedral silica layers. Interposition of stripped layers within montmorillonite creates a regular 1…
The presence of limited amounts of water appears to improve the quality of anhydrous oxalic acid single crystals grown from acetic acid solutions. Water concentrations in the saturated solutions which allow crystallization of the anhydrous acid have been determined from the phase study of this ternary system. Near 50…
Magnetic and structural properties of the tetragonal phase of ternary Cu (0–12.5 at%)–Mn(55–42.5 at%)–Al(45 at%) alloy have been studied in relation to binary 45Al-Mn alloy. The substitution of Cu to Mn-Al alloy reduces the tetragonality c/a of the tetragonal phase from 1.30 of the 45Al-Mn to 1.20 of the 10 at% Cu all…
Abstract Thiazole-accelerated sulfur vulcanization of natural rubber gum stocks has been investigated at temperatures from 110° to 140° C for times over the range 1 to 10 4 min. Swelling measurements on the vulcanizates were used to estimate the contribution of chemical reactions to the network chain density, (ρM c −1…
Shozo Takeno; Mass-Difference Scattering and Lattice Thermal Conductivity, Progress of Theoretical Physics, Volume 30, Issue 1, 1 July 1963, Pages 144–145, http
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolycondensation of Mercaptobenzenediazonium SaltsCharles C. Price and Shigemitsu TsunawakiCite this: J. Org. Chem. 1963, 28, 7, 1867–1868Publication Date (Print):July 1, 1963Publication History Published online1 May 2002Published inissue 1 July 1963https://pubs.acs.org/doi/…
At 460°C the passage of direct current through ceramic pellets of cerium dioxide containing one weight percent calcium oxide caused distinct volume discolorations to appear. The current at constant applied bias increased gradually from its initial value during the formation of the discolored regions, finally reaching…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical and Theoretical Studies on Some Solid Complex Diazonium Salts of p-Dimethylaminobenzenediazonium Chloride. I. Magnetic InvestigationsEdward A. Boudreaux, Hans B. Jonassen, and Leroy J. TheriotCite this: J. Am. Chem. Soc. 1963, 85, 14, 2039–2043Publication Date (Prin…
Measurements and calculations using elliptically polarized light to determine the thickness and index of refraction of barium stearate films on a variety of substrates are described. Attention is focused especially upon problems associated with the study of very thin films, that is, films which are less than 100 Å thi…
Abstract Morphological, chemical, mineralogical, and physical data are reported for 13 profiles of Grumusols, representing 3 soil series, all of which have developed in the Beaumont clay geological formation. These are the dominant soils in a narrow 10 million‐acre strip, some 40 miles wide, that extends 300 miles in…