Materials Literature
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The theory of the physical properties of an anharmonic crystal is discussed by using the thermodynamic Green's functions for the phonons. A perturbation procedure is developed to obtain the Green's functions and it is shown that for some purposes a quasi-harmonic approximation is useful, in which the frequencies of th…
One of the important properties of silicic acid is its tendency of polymerization. Therefore, its solution, when dilute, is always colloidal in property, and when of sufficient concentration, sets into a gel. There are many factors which influence the rate of polymerization of silicic acid, but the most important and…
Investigations of electron spin resonance (ESR) spectra of ${\mathrm{Yb}}^{3+}$ and ${\mathrm{Dy}}^{3+}$ in the cubic crystal field of calcium oxide show $g$ factors which are smaller than the calculated $g$ factors. It is shown that covalent bonding through the effect of the orbital reduction factor can explain these…
Reinvestigation of the region of the argon $K$ absorption edge has revealed a new resonance absorption structure followed by a new continuum. These new features may be interpreted as arising from double-electron-excitation processes involving an $M$ electron as well as the $K$ electron. The first new resonance line li…
Features of the optical absorption spectra of point defects in solids that are analogous to those of the Mossbauer spectra in solids are considered, and the observation of the corresponding zero-phonon lines associated with some of the F-aggregate color-center bands in LiF, NaF, NaCl, KCl, and KBr are reported. (C.E.S…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. R. Carruthers, K. E. Benson; SOLUTE STRIATIONS IN CZOCHRALSKI‐GROWN SILICON CRYSTALS: EFFECT O…
The crystal structures of various synthetic ABO/sub 4/ compounds, in which A is one of the rare earths La, Ce, Nd, Sm, Gd, Dy, Y, or Sc, and B is either Nb or Ta, were examined. Most of the compounds are isotypic with the monoclinically distorted scheelite-like structure, identified for a high- temperature-fired speci…
Summary The concept of chemical potential was applied in studying the form of soil phosphate present in some Manitoba soils. Generally for all the soils studied, the soil phosphates were more soluble than hydroxyapatite but less soluble than dicalcium phosphate dihydrate. Evidence was obtained for the existence of oct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Molecular Structure on Properties of Highly Cross-Linked Urethane PolymersW. C. Darr, P. G. Gemeinhardt, and J. H. SaundersCite this: Ind. Eng. Chem. Prod. Res. Dev. 1963, 2, 3, 194–199Publication Date (Print):September 1, 1963Publication History Published online1…
The results of a state-of-the-art survey covering niobium and 18 of its most promising alloys are presented. All data are given in tabular and graphical form covering some of the more important physical, mechanical, and metallurgical properties for each material. References are given at the conclusion of each material…
Abstract The potentiometric and viscometric behavior of carboxymethylcellulose have been studied with solutions containing potassium chloride. It has been found that the titration results can be described by the modified form of the Henderson equation pH = p K m + n log α/(1 — α), the values of p K m and n being depen…
and over the temperature range 298.15 to 1,200 °K. These properties are derived in analytical form, and in most cases are represented by numerical equations, with tabulation for zirconium and H/Zr atom ratios of 0.25, 0.50, 0.57, 0.75, 1.00, and 1.25. Most of the unique phase-field boundaries which are consistent with…
Abstract Stereoregular polybutadienes, of both high trans and high cis contents, were isomerized to provide polymers of varying cis‐trans content. These isomerizates were used to study structural effects on physical properties. The isomerizations were carried out under photosensitized conditions in benzene solution at…
Summary Single crystal X-ray examination has shown that högbomite forms a series of polytypes, designated nH or nR , with hexagonal or rhombohedral lattices and hexagonal unit-cell dimensions a 5·72 Å, c 4·6 × n Å. The polytypes arise by variation, in a manner as yet undetermined, of the stacking sequence of approxima…
Examination of the thermal decomposition of urea inclusion compounds has been extended to complexes of the even-numbered members of the following aliphatic series: n-alcohols, n-alkylamines, n-alkyl bromides, and n-carboxylic acids. The decomposition has been studied primarily by differential thermal analysis and an a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the Standard Potential of the Titanium(III)-Titanium(II) CoupleJohn W. Olver and James W. RossCite this: J. Am. Chem. Soc. 1963, 85, 17, 2565–2566Publication Date (Print):September 1, 1963Publication History Published online1 May 2002Published inissue 1 September 1963http…
A peak in the wavelength dependence of the index of refraction resulting from the increase in the extinction coefficient at the absorption edge has been observed in PbS. The results were obtained by analysis of the reflection spectra of $n$-type single crystal film and bulk samples. At 300\ifmmode^\circ\else\textdegre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of Polyether and Polyolefin Polymers by Gas Chromatographic Determination of the Volatile Products Resulting from Controlled Pyrolysis.E. W. Neumann and H. G. NadeauCite this: Anal. Chem. 1963, 35, 10, 1454–1457Publication Date (Print):September 1, 1963Publication H…
It has been shown with single crystals, bicrystals, and polycrystalline material that the strength of magnesium oxide depends on the availability of mobile dislocation sources. Mobile dislocations, introduced by mechanical contact at the surface, are responsible for the ductility normally observed in single crystals.…
The susceptible paths for stress corrosion cracking in Type 304 stainless steels were identified by electron microscopic examination of thin sections before and after exposure to boiling 42 percent MgCl2 These paths were found to be generated by the corrosion reaction, particuarly the cathodic part of this reaction. T…