Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPositive Halogen Compounds. VI. Effects of Structure and Medium on the β-Scission of Alkoxy RadicalsCheves. Walling and Albert. PadwaCite this: J. Am. Chem. Soc. 1963, 85, 11, 1593–1597Publication Date (Print):June 1, 1963Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinders for Nonwoven Fabrics. Evaluation of Binders Based on Copolymers of Vinyl AcetateR. L. Adelman, G. G. Allen, and H. K. SinclairCite this: Ind. Eng. Chem. Prod. Res. Dev. 1963, 2, 2, 108–113Publication Date (Print):June 1, 1963Publication History Published online1 May…
The high series capacitance theory for the response of interleaved transformer windings to surge voltages is criticized from the point of view that an increased series capacitance as a result of interleaving is incompatible with the concept of a pure capacitive initial voltage distribution. A new theory is proposed ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganosulfur Derivatives of the Metal Carbonyls. IV. The Reactions between Certain Organic Sulfur Compounds and Iron CarbonylsR. B. KingCite this: J. Am. Chem. Soc. 1963, 85, 11, 1584–1587Publication Date (Print):June 1, 1963Publication History Published online1 May 2002Publ…
The magnetic anisotropy of a single crystal of Mn 5 Ge 3 is measured by means of a torque magnetometer. The direction of easy magnetization is found to lie along the c -axis between room and liquid nitrogen temperatures. The anisotropy constants are determined as 3.0×10 5 erg/cm 3 at room temperature and 4.2×10 6 erg/…
The thermal conductivity of a perfect but finite crystal is investigated at low temperatures when Umklapp processes may be neglected. The sample is taken to be large compared with the mean free path due to momentum conserving phonon-phonon processes. A mean free time approximation is used for the phonon distribution f…