Fractographic clinker study by means of sweep electronic microscope (SEM). Preliminary results
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Rare Earth Permanent Magnets
Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation E. A. Nesbitt, J. H. Wernick, T. R. McGuire; Rare Earth Permanent Magnets. Physics Today 1 December 1973; 26 (12): 59–60. https://doi.org/10.1063/1.3128366 Download citation file: Ris (Zotero) Reference Manag…
Free-volume model for ionic conductivity in polymers
Electrical conduction in polymers under a relatively low applied electric field is considered to be ionic and is affected strongly by the structural factors of the polymers. The following equation for the electrical conductivity σ was derived in which free volume Vf, jump energy Ej, and ionic dissociation energy W wer…
X-ray photoelectron spectroscopy of nickel compounds
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy of nickel compoundsJ. Matienzo, Lo I. Yin, Samue O. Grim, and William E. Swartz Jr.Cite this: Inorg. Chem. 1973, 12, 12, 2762–2769Publication Date (Print):December 1, 1973Publication History Published online1 May 2002Published inissue 1 Decem…
Luminescence of Bi4 Ge3 O12 : Spectral and decay properties
Intense broadband emission in the visible is observed from crystals of Bi4Ge3O12 under optical and x-ray excitation. From measurements of absorption, reflection, fluorescence, and excitation spectra, the emission is assigned to 3P1 → 1S0 transitions of Bi3+. The Stokes shift is large, [inverted lazy s]14 000 cm−1. The…
Crystal structures of some double hydroxide minerals
Summary Three groups of minerals are discussed, which are typified by pyroaurite and sjögrenitc, hydrocalumite, and ettringite. All show interesting structural features. In the pyroaurite-sjögrenite group, brucite-likc layers carrying a net positive charge alternate with layers in which the oxygen atoms of carbonate g…
The effects on rubber elasticity of the addition and scission of cross-links under strain
Abstract Edwards’s equilibrium theory of rubber elasticity is used to study the effect on the network elasticity of the consecutive addition and removal of cross-links under different strains. The treatment is compared with those of Flory, Scanlan and others based on classical rubber elasticity theory. For a composite…
Thermoelectric Semiconductor Materials Based on Bi2Te3
Abstract : The physical-chemical thermal and optical properties of Bi2Te3 and solid solutions based on it are reviewed, as are the influences of defects and impurities. The technology of these materials is surveyed. The mobility and scattering mechanism of the charge carriers and the band structure are discussed. Ther…
On the extension of Frank's formula to crystals with different lattice parameters
The concepts involved in Frank's [1] formula and the treatment of surface dislocations by Bilby et al. [4] are combined to develop a vector equation for the closure failure associated with a boundary between crystals with different lattice parameters. The relation between the extended Frank's formula and Bollmann's wo…
Dielectric dispersion of ferroelectric triglycine sulphate in the microwave region
The dispersion of the dielectric constant of triglycine sulphate (TGS) is investigated in detail by measurements up to 10 GHz. The dispersion can be well described by a Debye equation. The characteristic relaxation frequency f̃o=fσ (σs-σ∞) shows only in the ferroelectric region an evident temperature dependence. The e…
On the electrical conductivity of V2O5 single crystals
The conductivity of pure and doped (Mo, Ti) V2O5 single crystals is measured along the three crystallographic directions in the temperature range 90 to 350° K. For T < 140° K, it is shown that conduction can be considered as a variable range hopping between defect levels, situated in the neighbourhood of the Fermi-lev…
Magnetic and crystallographic properties of ternary manganese silicides with ordered Co2P structure
MnNiSi (Tc = 622 K), the major part of the MnCo1−xNixSi system, and MnFe0.5Ni0.5Si are ferromagnetic. Co and Fe substitutions decrease Tc, but increase the total moment. Compositions close to MnCoSi show antiferro- to ferromagnetic transitions with increasing temperature. MnCoSi and MnRhSi are antiferromagnetic. We br…
Interdiffusion in the FeNi, NiCo, and FeCo systems
The temperature and concentration dependence of the interdiffusion coefficients as well as the activation energies for the FeNi, FeCo, and CoNi systems have been investigated over a wide range of temperature using electron probe microanalysis. The results are discussed on the basis of the equilibrium diagrams and t…
Infrared absorption of small silicon particles with oxide overlayers
The infrared optical absorption coefficient for spherical particles coated with a dielectric mantel and imbedded in a nonabsorbing dielectric medium has been predicted based on calculations of the average dielectric function. The theory represents an extension of the continuum, volume-averaging model of Genzel and Mar…
Threshold switching in gallium telluride single crystals
Gallium telluride single crystals have been grown and cleaved to form thin platelet specimens. Small-area contacts on opposite faces produce threshold switching characteristics when high fields are applied across them, while large-area contact produce memory switching. Detailed measurements of conductivity under DC an…
The elastic constants of calcium tungstate, 4$middot$2-300 K
The temperature dependences from 4·2 to 300 K of the seven adiabatic elastic constants of CaWO 4 have been determined by measurements of ultrasound wave velocities using the `sing-around' and pulse superposition methods. The adiabatic elastic constants have been calculated from the measured ultrasound wave velocities…
Solute Effects on Electromigration
The kinetics of the solute effect on solvent electromigration and the vacancy-flow effect on solute electromigration have been analyzed. The Howard and Manning type analysis has been applied to the diffusion data of a number of solutes in Al, Cu, Ag, and Au for determining the required jumping-frequency ratios. The cr…
Precision neutron diffraction structure determination of protein and nucleic acid components. XIII. Molecular and crystal structure of the amino acid L-glutamine
A neutron diffraction study of L-glutamine, C s H I o N 2 O a , has been carried out. Space group P212121; Z= 4; a = 16.020 (10), b = 7.762 (6), c = 5 119 (4) ,~. Full-matrix least-squares refinements, including anisotropic temperature factors for all atoms and an extinction correction, have led to a conventional R va…
Deep-Hole Excitations in Solids. II. Plasmons and Surface Effects in X-Ray Photoemission
The theory of x-ray photoemission (and related experiments) involving the excitation of a core state interacting with plasmons is presented. Specifically, the effects of the solid surface have been calculated, thus complementing the authors' previous calculation of the bulk effects. The strengths of the surface- and b…
X-Ray Photoelectron Spectra of the Valence Bands of Some Transition Metals and Alloys
Valence-band spectra of Cu, Ni, and Ag, obtained using x-ray photoemission, are compared with one-electron densities of states. Similar measurements on the CuNi and AgPd alloy systems are shown to be compatible with the predictions of the coherent-potential approximation.