Materials Literature
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A general theory of the polarization waves in crystals is developed in connection with the optical and the dielectric properties of the crystals. The result includes, in more general form, the relations by Szigeti and Fröhlich about the lattice vibrations in ionic crystals and the theory by Heller and Marcus for the e…
An examination is made of the spin-lattice relaxation in the solid state of nuclei whose energy level spacings in a magnetic field are rendered unequal by quadrupole interactions with the crystalline electric field. Attention is directed to two special cases: (1) when the main magnetic field is suddenly increased from…
Selected mixtures in 69 binary systems involving Ab03, Ga20 a, CrZ0 3, Fe20 a, SczOa, In20 3, Y20 3, and the rare earth oxides were stud ied by X-ray diffraction techniques after heat treatment at various temperatures. A plot of the radii of the A +3 cations versus the radii of B+3 cations shows the regions of stabili…
Abstract Studies were conducted to determine why certain soil test methods fail to indicate the actual lime requirement in many Ohio soils. Samples of 14 soils from various areas of the State were collected for study. The soils were incubated with various rates of applied CaCO 3 to determine actual lime requirement of…
A systematic study of the problem of spherulitic growth in linear polymers in bulk has been carried out. A calculation of the radial growth of polymer spherulites is given for four models. These concern growth where the surface nuclei that control the rate are (1) bundlelike and coherent, (2) chain folded and coherent…
ESR spectra of copper complexes have been interpreted by means of molecular orbital theory, and the ``covalent'' character of both σ and π bonds have been discussed for a variety of compounds. Overlap integrals have been considered in a consistent manner in treating σ bonds. Particular attention has been given to Cu p…
X-ray analyses of some Recent desert lacustrine sediments in Nevada, California, and Oregon show that illite and montmorillonite are the most abundant clay minerals and that chlorite and kaolinite are present in subordinate amounts in the sediments of many of the lakes. These clay suites are derived from source rocks.
The effect of electron-electron scattering processes due to Coulomb forces on the transport phenomena in nonpolar isotropic solids is treated in the framework of Kohler's variation principle. By considering the conduction electrons as a Fermi-Dirac gas of noninteracting free quasi-particles, each with charge $\ensurem…
Young's modulus was measured over the temperature range 77\ifmmode^\circ\else\textdegree\fi{}-850\ifmmode^\circ\else\textdegree\fi{}K by an accurate resonance technique. Data are presented for single crystals of aluminum oxide with various orientations of the crystallographic axes and for polycrystalline aluminum oxid…
Samples of graphite have been recovered after exposure to explosive shocks of 300,000-atm estimated intensity. X-ray and electron-diffraction examinations prove the existence of diamond in this material. The mechanism proposed for the formation of diamond under these conditions is simple compression in the c-axis dire…
Abstract A systematic investigation has been made of the effect of fatty acid composition on the compatibility of the corresponding mixed morpholides as plasticizers for vinyl chloride‐vinyl acetate copolymer resins. Plasticizer evaluation data were obtained for the morpholides of lauric, palmitic, elaidic, and epoxyo…
In the paper is discussed the stability of elastic structures which are liable to become unstable under load. In particular the behaviour of the system, comprising an elastic structure and its loading device is considered, and theorems concerning this behaviour are presented. The theorems allow considerable informatio…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Leslie S. Forster, Keith DeArmond; Luminescence of Chromium (III) Complexes. J. Chem. Phys. 1 Jun…
General expressions for the various orders of temperature diffuse scattering (TDS) for cubic elements are developed which show that the diffuse peaks at the Bragg maxima are broader for the higher order TDS contributions, and which also show that the average value of/th order TDS (in electron units per atom) isf 2 exp…
The high temperature modification of sodium ferrite, β-NaFeO 2 , has weak ferromagnetism, whose Curie temperature is about 450°C. The magnetic property resembles that of LaFeO 3 . The origin of weak ferromagnetism of β-NaFeO 2 can be attributed to the presence of the Dzyalo-shinsky type interaction in this compound.
The Ru–B and Os–B systems were investigated by x-ray powder diffraction. In addition to Aronsson's hexagonal Ru7B3 phase, two new hexagonal Ru–B phases were found: RuB2(D6h1—P6/mmm, a0=2.852 A, c0=2.855 A) and Ru2B5(D6h4—P6/mmc, a0=2.89 A, c0=12.81 A. In the Os–B system, two new hexagonal phases, isomorphous with the…
This paper describes an instrument for recording the coefficient of static friction between samples of cloth by reciprocating one sample and recording the resultant motion of the other when restrained by springs. Some test results are given for cloths of different structure and those made from yarns spun on normal and…
Fused aluminum oxide containing a small amount of nitrogen (as added aluminum nitride) showed X‐ray powder diffraction patterns similar to the δ‐alumina obtained from the calcination of alumina mouohydrate in dry air. About 1% nitrogen was adequate for complete conversion of the α phase to the δ phase. A fused mixture…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation K. Wihksne, A. E. Newkirk; Electrical Conductivities of α‐ and β‐Phthalocyanine. J. Chem. Phys. 1…
The distribution of the magnetization is calculated for a thick ferromagnetic slab with easy axis transverse to the plane of the slab in a large applied field in the plane of the slab. The calculation predicts a stable nonuniform distribution which has several features suggestive of the domain pattern to be expected i…