Materials Literature
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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…
Archard's diffusion model of electron back-scattering is discussed on the basis of a result obtained by Tomlin and Metchnik in 1963 in their treatment of x-ray emission intensities. The resulting simple formula for the back-scattering coefficient is in reasonably good agreement with measured values.
The effect of load on initial neck growth between alumina single‐crystal spheres has been measured at 1530°C. The neck areas are larger than those observed in pressureless sintering and constant for all times between 10 and 480 minutes. The neck areas are proportional to the loads; i.e. they equilibrate at equal stres…
The crystal structure of kyanite, Al 2 SiO 5 , has been refined by three-dimensional least-squares techniques. Refinement was based on observed data measured using a single-crystal counter diffractometer, and reduced the disagreement factor, R , for 981 hkl reflections to 8.6%. The triclinic kyanite structure proposed…
It is shown that the spin Hamiltonian for ${\mathrm{Cr}}^{3+}$ ions in the ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ lattice has to be augmented by a term $\ensuremath{\Sigma}{i}^{}\ensuremath{\Sigma}{j\ensuremath{\le}k}^{}\frac{1}{2}{R}_{\mathrm{ijk}}{E}_{i}({S}_{j}{S}_{k}+{S}_{k}{S}_{j})$ in the presence of an externall…
By means of transmission electron microscopy, ferromagnetic domain structures have been studied in thin cementite (Fe3C) particles embedded in a ferrite matrix. In general, the domain structure was found to consist of parallel strips alternately magnetized along the positive and negative direction of the easy axis of…
The possibility that terms other than Fermi contact interaction make significant contributions to nuclear spin-spin coupling with heavy nuclei has stimulated considerable interest in the n.m.r. spectra of compounds containing heteroatoms. In particular, relative signs and magnitudes of J_(XCH) and J_(XCCH) have be en…