Materials Literature
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Abstract In the preparation of magnesium oxychloride cement from MgO and MgCl 2 .6H 2 O solution, MgO is sometimes replaced by partially calcined dolomite, MgO.CaCO 3 . In this paper, the suitability of dolomites for this purpose was studied by use of petrographic, d.t.a. and X ‐ray diffraction techniques. It is shown…
A technique has been developed for extracting one of the phases present in Ni-Co-Al-Ti-Cu-Fe permanent magnet alloys heat-treated to give optimum magnetic properties. Examination of such extracts by electron microscopy and electron-probe microanalysis has confirmed previously held theories that the precipitate is stro…
SUMMARY A new centric diatom, Microsiphona potamos gen. et sp. nov. (family Coscinodiscaceae), is described from the Little Miami River, Cincinnati, Ohio, where it occurred at cell densities ranging from 29 to 20,140/ml in surface grab samples during the period May 18–December 14, 1966, contributing an average of 11%…
The major features of the images of dislocation dipoles obtained by two-beam electron microscopy which enable dipoles to be identified and distinguished from other defects are discussed. The positions of stable equilibrium of dipoles in various f.c.c. and b.c.c. materials have been derived using linear anisotropic ela…
Transmission electron micrographs of replicas and glass chips mounted on carbon films can be obtained in the scanning electron microscope. The standard collection system is used and only slight modifications made to the specimen stage.
Photomicrographs are presented of a naval brass which has undergone dezincification, presumably by fresh water. Detailed analysis of them leads to the conclusion that dezincification must have occurred by the mechanism of redeposition of the copper.
The temperature dependences of the saturation magnetization sigma s and of the anisotropy K 1 were measured in single crystals of Mg x Mn y Fe 3-x-y O 4 , 0<or=x<or=0.63, y approximately=0.6. The magnitude and temperature dependence of the anisotropy contributions H 1 of Fe 2+ , Mn 3+ and Fe 3+ ions in B sites were fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of ring size on the stability of polyamine complexes containing linked consecutive ringsDavid C. Weatherburn, Edward J. Billo, J. Paul Jones, and Dale W. MargerumCite this: Inorg. Chem. 1970, 9, 6, 1557–1559Publication Date (Print):June 1, 1970Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, properties, and structure of cuprous ammonium thiomolybdateW. P. Binnie, Michael J. Redman, and W. J. MallioCite this: Inorg. Chem. 1970, 9, 6, 1449–1452Publication Date (Print):June 1, 1970Publication History Published online1 May 2002Published inissue 1 June 1…
The varieties of compounds and solid solutions in which simultaneous ferroelectric properties and magnetic order have been demonstrated are reviewed and literature references are given. Materials investigated so far have contributed to fundamental understandings of processes in crystals and a variety of techniques and…
The variation of total loss under the tensile stress applied along the near [001] direction has been measured on the single crystals with (110) [001] orientation of 3% silicon-iron. It has been found that the total loss was greatly decreased with an application of stress. This effect is more remarkable when the orient…
1. A method is described for studying the peristaltic reflex in the guinea-pig or cat isolated colon, using a graded localized intraluminal stimulus consisting of a solid bolus.2. The method gives an easy evaluation of propulsive activity and makes it possible to record simultaneously the segmental activity of the cir…
The prospect that permanent magnets with previously unattainable coercivities and energy products might be made from cobalt-rare earth alloys has caused intense research efforts in the last three years. Alternative ways of preparing magnets from powders and by casting were demonstrated in several laboratories.(BH)_{\m…
Energy levels, linewidths, and oscillator strengths for trivalent neodymium ions in a commercial laser glass were determined from the fluorescence and absorption spectra. The spectra were composed of broad groups of overlapping lines and were deciphered from spectral variations produced by changes in glass temperature…
Epitaxial layers of ZnO have been deposited by chemical vapor transport on single-crystal sapphire substrates. The ZnO layers have been deposited up to thicknesses of 100μ. X-ray analysis showed that the c axis of the ZnO could be made to lie parallel to the (0112)-oriented sapphire substrate. Resistivities were gener…
Ceramic samples of SrTiO3, containing a wide range of solid substitution of trivalent rare-earth ions, have been fabricated and examined in detail. Well-developed dielectric relaxation was observed in samples containing lanthanum, praesodymium, neodymium, samarium, gadolinium, terbium, dysprosium, holmium, erbium, thu…
The effects of sintering temperature and cooling rate on the magnetic and crystallographic properties of lithium ferrite were studied. The magnetic moments and lattice parameters increased with increasing sintering temperature; these increases result from correlated oxygen and lithium oxide losses. Either annealing at…
Abstract The relative abilities of various solvents to dissolve crystalline polyvinylidene chloride were judged by comparing temperatures at which dilute suspensions became homogeneous. PVDC is not soluble in common solvents at ambient temperatures. It dissolves in solvents of matching solubility parameter only above…
The transfer of energy from $\mathrm{Yb}^{2}F_{\frac{5}{2}}$ to $\mathrm{Tb}^{5}D_{4}$ by the cooperative action of two ${\mathrm{Yb}}^{3+}$ ions has been observed in Y${\mathrm{F}}_{3}$. The correlation between the $\mathrm{Tb}^{5}D_{4}$ intensity and the $\mathrm{Yb}^{2}F_{\frac{5}{2}}$ and $\mathrm{Tb}^{5}D_{4}$ li…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of surface reactions of nitric oxide by nitrogen-15 isotope labeling. I. Reaction between nitric oxide and ammonia over supported platinum at 200-250.deg.Klaus Otto, Mordecai Shelef, and J. T. KummerCite this: J. Phys. Chem. 1970, 74, 13, 2690–2698Publication Date (P…