Materials Literature
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The Ho-Fe and Ho-Ho interaction parameters are discussed in reference to optical Zeeman spectroscopic data and magnetization data on HoFe${\mathrm{O}}_{3}$. A molecular-field model is presented that incorporates these parameters in a systematic manner permitting accurate calculations of the ground-state pair Zeeman sp…
An empirical corresponding states relationship between the ratio of the heat capacities Cp/Cv of polymers and the reduced temperature T/Tg has been found. This relationship is discussed in terms of corresponding states behavior. This relationship is significant and useful in that the ratio Cp/Cv is a fundamental quant…
Crystallographic shear appears to be a defect-controlled type of process for the formation of the oxides in the homologous series such as TiO2-x, WO3-x out of their respective stoichiometric phases TiO2 and WO3. After an introductory chapter on the relation between non-stoichiometry and shear structures, giving a geom…
Abstract The solution spectra of two tris(dipyrromethenato)manganese(III) complexes and of one bis(dipyrromethenato) manganese (II) as well as the diffuse reflectance spectrum for the latter were examined. The high spin state was confirmed for all the manganese complexes by magnetic susceptibility measurements. For th…
Abstract Absorption and emission spectra as well as emission quantum yields and lifetimes of 5,10‐dimethylphenazine (DMP), 5‐methyl‐10‐phenylphenazine, and 5,10‐diphenylphenazine were measured in 3‐methylpentane at room temperature and 77°K. By means of relative polarization measurements in conjunction with CNDO/2‐CI…
Abstract Poly(ethylene terephthalate) was separated into 12 fractions of equal size by a stepwise increase in the amount of solvent in the two‐phase liquid fractionation system of phenol‐tetrachloroethane (PTCE) (1:1) and n ‐heptane. Various molecular weight parameters of the fractions were measured by osmotic pressur…
Abstract The dc conductivity of hydrated bovine Achilles' tendon collagen has been determined as a function of hydration over a limited temperature range. At ambient temperature the conductivity changes from 10 −15 (Ω cm) −1 in the dry state to about 10 −8 (Ω cm) −1 at ∼24% water content by weight. For all temperature…
Abstract Proper drying techniques prior to molding can eliminate the overall effects of moisture on the physicochemical properties of polycarbonate. Problems associated with moisture in polycarbonate during molding are described in detail. Moisture absorption is very rapid with the maximum allowable moisture content o…
The magnetostriction of several polycrystalline compounds in the Hox Tb1−x Fe2 series have been measured from 77–300°K using magnetic fields up to 17.5 kOe. The extrapolated saturation magnetostriction at room temperature varies linearly with x between 80 × 10−6 for HoFe2 and 1720 × 10−6 for TbFe2, in good agreement w…
By a detailed consideration of the geometrical consequences of shear displacements in Ll2 γ' and the requirement of compatibility with the fcc γ matrix, it has been possible to define the shear modes potentially operative in γ' precipitation hardened nickel-base alloys. Most of these geometrically possible deformation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of dinitro(1,4,7,10-tetraazacyclododecane)cobalt(III) chlorideYoichi. Iitaka, Muneki. Shina, and Eiichi. KimuraCite this: Inorg. Chem. 1974, 13, 12, 2886–2891Publication Date (Print):December 1, 1974Publication History Published online1 May 2002Published in…
A strong Jahn-Teller effect is shown to be present for ${\mathrm{Cu}}^{+2}$ in CsCd${\mathrm{Cl}}_{3}$ by studying the electron-paramagnetic-resonance spectra at temperatures between 1.6\ifmmode^\circ\else\textdegree\fi{}K and room temperature. The ${\mathrm{Cu}}^{+2}$ ions occupy two magnetically inequivalent crystal…
An experimental investigation of the effect of a cuprous oxide coating upon the surface flashover of high-density alumina in vacuum is reported. It is shown that such coatings improve the impulse strength of the system and eliminate the conditioning effect observed in the case of uncoated specimens at dc and 60-Hz vol…
The first published micrograph of a biological specimen photographed in a high voltage electron microscope (HVEM) appeared in a paper by Van Dorsten et al. in 1947, and it is consequently surprising that the HVEM does not play a greater role in biology 27 yr later. There are various reasons for this. The first prototy…
Single crystals of copper containing dispersions of small Al2O3 particles have been deformed in tension and subsequently in compression at 77°K and the nature of the stress-strain curves and the dislocation structure have been investigated. As predicted, a large Bauschinger effect is observed, but this is substantiall…
When an internally oxidized Cu-Al2O3 alloy with Al2O3 particles of diameter <500 Å is plastically deformed, each particle is likely to be intersected by only one or two slip planes. Consequently, at low temperatures, Orowan loops are expected to form coplanar pile-ups rather than the vertical stacks assumed in recent…
Abstract Surface acidity of almost homoionic montmorillonites was measured by titrating selected Hammett indicators adsorbed on the clay with n -butylamine. As expected, the acidity is strongly affected by the exchangeable cations and the degree of hydration of the clay. Greater polarizing ability of the interlayer ca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and activity of optically active disparlureShigeru Iwaki, Shingo Marumo, Tetsuo Saito, Minoru Yamada, and Kazumasa KatagiriCite this: J. Am. Chem. Soc. 1974, 96, 25, 7842–7844Publication Date (Print):December 1, 1974Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of 12-Molybdophosphoric and 12-Molybdosilicic Acids and Their Metal SaltsGeorge A. TsigdinosCite this: Ind. Eng. Chem. Prod. Res. Dev. 1974, 13, 4, 267–274Publication Date (Print):December 1, 1974Publication History Published online1 May 2002…
We have computer simulated the structure of thin amorphous films grown from a vapor. Our hard-sphere model shows that structural anisotropy and voids are a natural occurrence of the deposition process. The amount of unfilled space (voids) and the anisotropy have been studied as a function of the angle of incidence of…