Materials Literature
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This paper discusses some effects of mobile electrons in some antiferromagnetic lattices. It is shown that these electrons (or holes) always give rise to a distortion of the ground state spin arrangement, since electron transfer lowers the energy by a term of first order in the distortion angles. In the most typical c…
Abstract Studies of the kinetics of adsorption of oxygen on zinc oxide over the temperature range from 25 to 390°C have provided evidence for two distinct types of chemisorption, one prevalent below 200 and the other above 300°C. This pattern of activity has been confirmed by measurements of desorption rates over the…
The Madelung formulas for the electrostatic potential of a linear or planar Bravais lattice of ions, neutralized by a uniform distribution of charge, are extended to the lattice sums over a linear or planar Bravais lattice involving two-body interactions of the type ${R}^{\ensuremath{-}n}$ ($R$, interatomic distance;…
RbHS${\mathrm{O}}_{4}$ is ferroelectric below -15\ifmmode^\circ\else\textdegree\fi{}C. The room-temperature phase is monoclinic, with space group $\frac{P{2}_{1}}{c}$, $a={14.35}_{6}$ A, $b={4.62}_{2}$ A, $c={14.80}_{7}$ A, $\ensuremath{\beta}=121.0\ifmmode^\circ\else\textdegree\fi{}$ and $Z=8$. The symmetry of the fe…
Received 15 February 1960DOI:https://doi.org/10.1103/PhysRevLett.4.282©1960 American Physical Society
An important unanswered question concerning the sidewise motion of 180\ifmmode^\circ\else\textdegree\fi{} domain walls in single crystal BaTi${\mathrm{O}}_{3}$ is the mechanism by which the boundaries move. This paper considers two possible models. One model assumes that the wall motion results from the repeated nucle…
Corrosion and weldability studies have been made on Cr-Mn-Ni and Cr-Mn-N grades of austenitic stainless steel to determine their usefulness for chemical plant applications. These studies show that the corrosion resistance of Type 202 (18% Cr-5% Ni-8% Mn-0.10% max. C) stainless steel is comparable to that of Type 304 s…
A comprehensive survey of the literature on the tearing strength of fabrics is presented. The various test methods employed for determining tearing strength, the machines and instruments used in making these tests, and the different expressions for tearing strength are discussed. The elfccts of the type of fibre, clot…
(1960). Direct electron microscopy of thin foils of internally oxidized dilute copper alloys. The Philosophical Magazine: A Journal of Theoretical Experimental and Applied Physics: Vol. 5, No. 51, pp. 298-301.
Abstract The infrared spectra (tilting spectra) obtained with the incident beam inclined to oriented films are discussed. Various experimental settings for obtaining the tilting spectra are studied. It is pointed out that quantitative interpretations (to determine the direction of the transition moment of a normal mod…
Dielectric, lattice constant, and thermal‐expansion measurements have been made on solid solution ceramics in the systems PbTiO 3 Pb 0.5 NbO 3 and PbTiO 3 ‐Pb o.5 TaO 3 . The ferro‐electric Curie temperature is lowered to 465OC. at the solubility limit (2 to 5% Nb or Ta). Replacement of Ti 4+ by Nb 5+ or Ta 5+ in thes…
Abstract It has been shown that the resonance‐stabilized, six‐membered lactam, α‐piperidone, is polymerized by alkali metal and acyl compounds to form poly‐5‐valeramide, melting point 259°C., [ r ] = 0.25, d = 1.243. A mechanism is proposed for the polymerization of α‐piperidone with alkali metal and acyl compound whi…
The fundamental parameters of gold in germanium have been investigated between 60-300\ifmmode^\circ\else\textdegree\fi{}K by absorption, photoconductivity, and lifetime studies.Photoconductivity measurements reveal the following capture cross sections for electrons and holes at 80\ifmmode^\circ\else\textdegree\fi{}K (…
Abstract The hydrolysis of dicalcium phosphate dihydrate, CaHPO 4 ·2H 2 O, in dilute phosphoric acid solutions and in water was investigated at 25° C. in the absence of CO 2 . Octocalcium phosphate, Ca 4 H(PO 4 ) 3 ·3H 2 O, was found to precipitate when the pH of the solution was higher than 6.38. The extent of the hy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimorphecolic Acid—A Unique Hydroxydienoid Fatty Acid2C. R. Smith Jr., T. L. Wilson, E. H. Melvin, and I. A. WolffCite this: J. Am. Chem. Soc. 1960, 82, 6, 1417–1421Publication Date (Print):March 1, 1960Publication History Published online1 May 2002Published inissue 1 March…
The interaction between a carbon black filler and styrene-butadiene rubber is increased if the material is heated after milling. This effect has been attributed to the polymeric free radicals which are presented after milling but which require a high temperature to increase their mobility to the point where they can r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Melting Temperature of Natural Rubber NetworksD. E. Roberts and L. MandelkernCite this: J. Am. Chem. Soc. 1960, 82, 5, 1091–1095Publication Date (Print):March 1, 1960Publication History Published online1 May 2002Published inissue 1 March 1960https://pubs.acs.org/doi/10.1…
The aqueous solubilities of 16 carefully purified disperse dyes have been measured over the temperature range 60–90°C. From these results, the heats of solution in water have been found to lie mainly in the range 10–20 kcal./mole. It is suggested that the higher heats of solution are associated with the presence of hy…
The scattering of electrons and x-rays by stacking faults is due to a phase change in the diffraction by crystal planes which do not lie parallel to the fault. A simple model of the process in copper estimates a resistivity p≃1 × 10−12 β ohm-cm for a total stacking fault density of β cm−1 on all planes. A wave matchin…
Earth-alkali oxides and bivalent transition-metal oxides will form compounds ABO 2 when the earth-alkali ion is large and the transition-metal ion is small.