Materials Literature
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Binder phase (primarily chloride or nitrate) formation was examined in YX 3 ‐NaOH‐H 2 O, Y 2 O 3 ‐acid‐H 2 O, and Y 2 O 3 ‐salt‐H 2 ‐O systems. The cementitious phase consisted mostly of plate‐ (or needle‐) shaped hydroxy salts of the general formula Y 2 (OH) 6‐m X m n H 2 O, where m and n normally equal one. These bi…
Elasticity, internal friction, and thermal expansion were measured at temperatures up to 1500°C to characterize the micro‐cracking behavior of HfO 2 . Crack‐free HfO 2 showed consistent, typical changes in these properties with temperature. Micro‐cracked HfO 2 showed hysteresis in the elastic moduli and thermal expans…
Hypertension, diabetes mellitus, hypercholesterolemia, and smoking are known coronary risk factors. It has been our impression that premature graying of the hair also predisposes individuals to myocardial infarctions. To test this hypothesis, we evaluated all of the patients under the age of 50 who were admitted to th…
The Lorentz force on an electron is utilised to separate out the electron component from the open beam of a Clinac-18, operating in the X-ray mode. The experimental arrangement is such that the mixed beam (comprising the primary photons, the scattered photons and the contamination electrons) enters an external magneti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRefinement of the crystal structure of orthorhombic zinc chlorideH. L. Yakel and J. BrynestadCite this: Inorg. Chem. 1978, 17, 11, 3294–3296Publication Date (Print):November 1, 1978Publication History Published online1 May 2002Published inissue 1 November 1978https://pubs.ac…
The oxidation of the active, high energy density materials, titanium and titanium hydride, has been studied by electrochemical and electron spectroscopic techniques. The apparent thickness of the oxide was controlled by the magnitude of the applied potential across thin (200–6000Å) films of these materials. Our electr…
The structural phase transition in the ferroelectric semiconductor alloy series ${\mathrm{Sn}}_{x}{\mathrm{Ge}}_{1\ensuremath{-}x}\mathrm{Te}$ has been investigated using high-precision x-ray techniques. The spontaneous strain occurring at the cubicrhombohedral transition has been measured as a function of temperature…
Abstract The dark brown anti-ferromagnetic modification of (C 5 H 5 ) 2 Mn crystallizes ortho-rhombic, space group Pna2 1 (or Pnam) with a= 1402.7(2), 6 = 582.9(1), c = 996.5(1) pm and Z = 4. It forms polymer chains with a zigzag arrangement of C 5 H 5 Mn units and additional bridging C 5 H 5 -rings between adjacent i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe dioxygen adducts of several manganese(II) porphyrins. Electron paramagnetic resonance studiesBrian M. Hoffman, Thomas Szymanski, Theodore G. Brown, and Fred BasoloCite this: J. Am. Chem. Soc. 1978, 100, 23, 7253–7259Publication Date (Print):November 1, 1978Publication Hi…
The mechanisms by which chlorides are removed from marine iron artifacts during washing processes were investigated. By comparing the decomposition rates of FeOCl and the chloride extraction rates it was shown that, under most conditions, the chloride removal process is diffusion controlled. The implications of this w…
The thermal radiation from metals is calculated by including the Holstein processes of phonon-assisted and surface-assisted scattering in the free-electron model. This approach provides a fairly accurate description of the experimentally measured total emissivity of good conductors in terms of the dc resistivity and t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate of electron exchange between iron, ruthenium, and osmium complexes containing 1,10-phenanthroline, 2,2'-bipyridyl, or their derivatives from nuclear magnetic resonance studiesMan-Sheung Chan and Arthur C. WahlCite this: J. Phys. Chem. 1978, 82, 24, 2542–2549Publication…
Abstract Dynamic mechanical properties of polystyrene (PS) and polymethylmethacrylate (PMMA) filled with glass beads and mica flakes have been investigated. The α‐dispersion temperature ( T α ) increases with filler content in each system. The increase in T α is larger for PMMA than for PS in the case of the same fill…
Various means of deuteration have been used to establish the hydrogenic origin of both the 119-G and 74-G hyperfine doublets observed in a variety of irradiated vitreous silica samples. The g values of both these defects appear inconsistent with an earlier model in which these lines were attributed to a hole localized…
The problem of the highly correlated electron gas ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ consisting of a filled ${a}_{1g}$ and a quarterly full ${e}_{g}$ band is treated on the basis of a Hartree-Fock calculation with spin and orbit unrestriction. The values of the effective hopping integrals which include covalency eff…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompatibility in Blends of Poly(methyl methacrylate) and Poly(styrene-co-acrylonitrile). 1. Physical PropertiesK. Naito, G. E. Johnson, D. L. Allara, and T. K. KweiCite this: Macromolecules 1978, 11, 6, 1260–1265Publication Date (Print):November 1, 1978Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance, magnetic, and x-ray crystallographic studies of a binuclear, imidazolate bridged copper(II) complex, [(TMDT)2Cu2(im)(ClO4)2](ClO4)Chi-Lin O'Young, John C. Dewan, Henry R. Lilenthal, and Stephen J. LippardCite this: J. Am. Chem. Soc. 1978, 100, 23, 72…
On the basis of our theoretical examination of the insulating state of ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ reported in the preceding two papers and the experimental results of NMR and susceptibility measurements of the metallic phase, we conjecture the highly correlated electron-gas character in this latter phase of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of organic anions. 86. Sodium and potassium carbonates: efficient strong bases in solid-liquid two-phase systemsMichal Fedorynski, Krzysztof Wojciechowski, Zygmunt Matacz, and Mieczyslaw MakoszaCite this: J. Org. Chem. 1978, 43, 24, 4682–4684Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of a New Crystal Form (αp) of Poly(vinylidene fluoride) under Electric FieldD. Naegele, D. Y. Yoon, and M. G. BroadhurstCite this: Macromolecules 1978, 11, 6, 1297–1298Publication Date (Print):November 1, 1978Publication History Published online1 May 2002Published…