Materials Literature
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Techniques for the fabrication of polycrystalline LiF test specimens were developed and evaluated using single‐crystal LiF as a control. An etch was developed which revealed dislocations on all crystallographic faces of LiF. Large‐grained polycrystalline specimens tested in four‐point loading underwent 0.076 to 0.798%…
The secondary electron coefficient γ has been measured for singly charged hydrogen, helium, nitrogen, neon, oxygen, argon and krypton ions in the energy range 10-140 keV incident on a tungsten surface. Measurements have been made within the monolayer adsorption time (similar 5 min) after production of an atomically cl…
Abstract The kinetics of isothermal crystallization and morphology of spherulites of nylon 6 nucleated by additives were discussed. Nylon 66, polyethylene terephthalate, and some inorganic phosphor compounds were used as nucleating agents. At crystallization temperatures in the range of 205 to 180°C., crystallization…
Manganite is monoclinic, pseudorhombic. Its structure is a superstructure based upon the marcasite type. The crystals show polysynthetic twinning. By x-ray measurements on a thin untwinned cleavage splint improved Mn parameters were obtained. For the neutron investigations twinned crystals had to be used. Because of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical and Magnetic Properties of Potassium Tungsten Bronze and Rubidium Tungsten BronzeM. J. Sienko and Sheila MacEnness MorehouseCite this: Inorg. Chem. 1963, 2, 3, 485–489Publication Date (Print):June 1, 1963Publication History Published online1 May 2002Published inis…
The linewidth of polycrystalline ferrites has been calculated from the dipole narrowing theory including both anisotropy and porosity effects. It is shown that porosity broadening is successfully accounted for and that porosity is the dominant line broadener even in very dense ferrites. The temperature dependence of t…
Expressions for spin wave energies in normal and inverse spinel have been obtained which are exact to all orders in the spin wave momentum. These dispersion curves have been compared with existing experimental data on magnetite and good agreement found if the principal exchange interaction is taken to be 2.4\ifmmode\t…
A calculation of shielding of the crystal field from the 4f valence electrons in Pr3+ due to the polarization of the outer (5s)2(6p)6 shell by the crystal field is reported. The effect is shown to be a principal constituent to the discrepancy of the experimental and theoretical values of the crystal-field parameters.
The anomaly of thermal conductivity at the magnetic transition point observed in certain magnetic crystals has been treated theoretically using the correlation function expression for the thermal conductivity. The heat conduction by the spin system is shown to be negligible in the vicinity of the transition point. The…
The magnetostriction of single-crystal yttrium iron garnet (YIG) has been measured from 100 to 450\ifmmode^\circ\else\textdegree\fi{}K by a capacitative technique in which the sample dilatation shifts the resonant frequency of an oscillator, and by standard strain gauge methods. To analyze the data, the theory of magn…
Abstract Resonance fluorescence of recoil‐free γ‐rays from atomic nuclei depends on the state of the chemical bonding of the atoms. The latter influences the position of the energy level of the atomic nuclei, so that the energy required for excitation of resonance fluorescence is somewhat smaller or greater than the e…
Abstract Bei den Phosphaten, Arsenaten und Vanadaten der Seltenen Erden treten zwei Strukturtypen auf. Die überwiegende Zahl kristallisiert mit der Struktur des Zirkons. Eine Reihe von Verbindungen mit den größeren Ionen der Seltenen Erden zeigt die Struktur des Huttonits bzw. Monazits. Beim TbPO 4 konnten beide Struk…
Abstract The dissolution of copper in aqueous solutions of ammonia is a corrosion process in which the cathodic reaction is the reduction of oxygen at the surface of the metal according to: and the anodic reaction is the oxidation of copper according to: Superimposed with these reactions is the cuprous‐cupric equilibr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsomerization and Disproportionation of d-Limonene on Silica GelG. L. K. Hunter and William B. Brogden Jr.Cite this: J. Org. Chem. 1963, 28, 6, 1679–1682Publication Date (Print):June 1, 1963Publication History Published online1 May 2002Published inissue 1 June 1963https://pu…
Abstract In isothermal crystallization of polymers, where the fusion preceding the crystallization process is conducted at relative low temperatures or in samples subjected to γ‐radiation, there is extensive secondary crystallization. Secondary crystallization, which has been found to start stepwise at a time equal to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline Lithiomethyl Trimethylsilane and Some of its PropertiesJohn W. Connolly and Grant UrryCite this: Inorg. Chem. 1963, 2, 3, 645–646Publication Date (Print):June 1, 1963Publication History Published online1 May 2002Published inissue 1 June 1963https://doi.org/10.102…
The kinetics of hydrogenase from Clostridium pasteurianum and from Proteus vulgaris were studied by measuring the HD and D/sub 2/ produced when the enzyme catalyzes the exchange between H/sub 2/ and 100% D/sub 2/O. The ratio of D/sub 2/ to HD production depends on the enzyme concentration because the HD produced by th…
Summary Chrysotile fibres, and also single crystals of lizardite, were dehydrated hydrothermally, and the resulting pseudomorphs studied by X-ray rotation photographs. The initial products are normally forsterite and disordered material; talc forms more slowly. At water pressures up to 600 kg/cm 2 , both forsterite an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure and Dipole Moment in Solution of the Compound AlH3·2N(CH3)3C. W. Heitsch, C. E. Nordman, and R. W. ParryCite this: Inorg. Chem. 1963, 2, 3, 508–512Publication Date (Print):June 1, 1963Publication History Published online1 May 2002Published inissue 1 Jun…
Mössbauer measurements were made on ferromagnetic Fe 3 Si and Fe 5 Si 3 to investigate the magnetic structure. In the ordered crystal of Fe 3 Si, two internal fields were found to be 320 kOe and 205 kOe at liquid nitrogen temperature, corresponding to the two crystallographically different sites, Fe(I) and Fe(II). Sin…