Materials Literature
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A theoretical study is made on the nuclear spin relaxation in magnetic crystals near their Curie temperatures. The exchange narrowed hyperfine broadening of the NMR line width is shown to increase due to the slowing down of a certain part of the electron spin fluctuations as the transition point is approached, giving…
Recent calculations of electron energy levels in body-centred cubic transition metals are used to estimate the position of the Fermi surface of non-magnetic chromium. It is shown that almost the whole of this surface is placed so that the introduction of an antiferromagnetic superlattice will lower the electron energy…
The thermal conductivity $K$ of a bulk sample of pyrolytic graphite has been measured from 3 to 300\ifmmode^\circ\else\textdegree\fi{}K both perpendicular and parallel to the $c$ axis. Over the whole temperature range below 100\ifmmode^\circ\else\textdegree\fi{}K the thermal conductivity in both directions appears to…
The crystal structures of α Al 2 O 3 , Ti 2 O 3 , V 2 O 3 , and Cr 2 O 3 have been refined using a least-squares analysis of single-crystal x-ray data. Interatomic distances and bond angles are calculated and compared with those of α Fe 2 O 3 .
An analysis is presented for the absorption corrections necessary for the x-ray analysis of diffraction data from a liquid sample confined within a cylindrical sample cell. The evaluation of necessary absorption integrals has been formulated in a numerical calculus procedure appropriate for a digital computer. The pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Conductivity of Heterogeneous Two-Component SystemsR. L. Hamilton and O. K. CrosserCite this: Ind. Eng. Chem. Fundamen. 1962, 1, 3, 187–191Publication Date (Print):August 1, 1962Publication History Published online1 May 2002Published inissue 1 August 1962https://pubs…
Magnetic and electric dipole transitions between levels of the 4fx configuration perturbed by a static crystalline field are treated. The expression obtained for the pure-electronic electric-dipole transition probability involves matrix elements of an even-order unit tensor between the two 4fx states involved in the t…
Abstract The activation polarization required to dissolve 18·8 chromium-nickel stainless steel anodically in 42 wt. % aqueous magnesium chloride solution is reduced by yielding of the metal perpendicular to the direction of dissolution. Yielding at strain rates of about 5% /min or more reduces the activation polarizat…
Abstract In den letzten Jahren sind zahlreiche Ringgerüste mit einer Dreifachbindung studiert worden, so Cycloalkine, Heterocyclen mit Dreifachbindung und speziell das Dehydrobenzol. Bislang ist es noch nicht gelungen, das Dehydrobenzol in Substanz zu fassen; die Möglichkeiten dazu werden dargelegt.
The dynamical behavior of uniformly moving dislocations in anisotropic media is considered for the general case in which the dislocation involves three components of displacement. It is found that both edge and screw dislocations can display an anomalous behavior. It appears that, in general, the force of interaction…
The matrix isolation technique has been extended to allow molecules which are in equilibrium with solids at high temperatures to be trapped and studied at low temperatures. A beam of the hot vapor issuing from a Knudsen cell or a heated surface is premixed with a large excess of argon or xenon just prior to condensati…
The symmetry properties of wave functions in magnetic crystals are discussed in terms of the irreducible representations of magnetic space groups. The specific effects of the magnetic ordering on the crystal eigenstates are found to be of three types: (1) There is a lifting of some eigenfunction degeneracies because t…
The atomic configurations and energies for point defects in copper have been studied theoretically using a classical model. The atoms near the defect are treated explicitly while the remainder of the crystal is treated as an elastic continuum with atoms imbedded in it. A Born-Mayer repulsive force law, $A{e}^{\ensurem…
A microscopic theory of phonon-magnon interaction in magnetic crystals is developed from first principles. The crystal field oscillations are treated as perturbations which superpose some excited orbital states on the ground orbital state of the magnetic ions. When use is made of these perturbed states as the starting…
A solution has been found for the rate of growth of crystal whiskers from the vapor when nucleation on the whisker surfaces does not occur. Expressions have also been derived relating the supersaturation ratio of adsorbed atoms along the whisker to the total length from which certain predictions can be made concerning…
The changes in residual electrical resistance produced by bombardment with high-energy electrons were measured for a number of metals as a function of electron energy in the range from 0.5 to 1.4 MeV. The irradiations were performed at \ensuremath{\lesssim}20\ifmmode^\circ\else\textdegree\fi{}K, and recovery measureme…
The study of a two-dimensional system consisting of 870 hard-disk particles in the phase-transition region has shown that the isotherm has a van der Waals-like loop. The density change across the transition is about 4% and the corresponding entropy change is small.
An investigation was made of the temperature and frequency dependence of T2 for O17 in aqueous solutions containing Mn2+, Fe2+, Co2+, Ni2+, and Cu2+. This represented an extension of the studies previously performed in this laboratory on these ions. Virtually all of the temperature effects predicted by the modified Bl…
The crystal structure of Pdl~Se15, with which Rhl~S15 (formerly alleged to be RhgSs) is isostructural, has been determined from single crystal data.The crystal belongs to one of the three space groups O~-Pm3m, T~-P-43m or O1-P432 with a lattice constant of 10"606 A and two PdlTSe15 per unit cell.It is shown that the X…
CrBr~ crystallizes in a monoclinic ~mit cell, space group C2/m, with a0--7.11~, b0--3.649, c0=6.21 ~ A; fl=93 53'.