Materials Literature
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To specify the condition for the anomalous thermal expansion due to a large spontaneous volume magnetostriction in ferromagnetic Laves phase intermetallic TFe 2 compounds, thermal expansion measurements for some TFe 2 compounds were made. The obtained results suggest that the anomaly is sensitive to the interatomic di…
An absolute gravimetric method of measuring surface and interfacial tensions of liquids by pulling a sphere through the interface is examined. The method also permits simultaneous measurement of the contact angle of the liquid on the sphere surface; this enables corrections to be made for incomplete wetting of the sol…
The system Mn 2 Sb (1- x ) As ( x ) (0≦ x ≦1) is found to be solid solutions of the Cu 2 Sb type by X-ray analysis. A magnetic phase diagram has been produced by magnetic measurments in the temperature range 80 to 1100 K. Transition from antiferromagnetic to ferrimagnetic states with increasing temperature was observe…
X-ray measurements have been carried out on paratellurite (${\mathrm{TeO}}_{2}$) at pressures up to 89 \ifmmode\pm\else\textpm\fi{} 1 kbar. Based on both single-crystal and polycrystalline data, a phase transformation from the tetragonal $P{4}_{1}{2}_{1}2 ({D}_{4}^{4})$ space group to the orthorhombic $P{2}_{1}{2}_{1}…
When acetonitrile solutions of tetrathiafulvalene [i.e., (C3S2H2)2; herein called TTF] and iodine, I2, are allowed to mix by diffusion, monoclinic crystals are formed with the approximate composition (TTF)7I5. These crystals have an electrical conductivity along the needle axis c of 300 ohm−1⋅cm−1 at room temperature.…
The magnetic interactions in Heusler alloys Pd 2 MnSn and Ni 2 MnSn have been investigated using neutron spin wave scattering. The spin wave dispersion relations along the [00ζ], [ζζ0] and [ζζζ] directions have been observed across the whole magnetic Brillouin zone. The results have been analyzed using a Heisenberg Ha…
We have studied the effects of water and defects on the Raman spectrum of fused silica. Intensities of defect lines at 604 and 490 cm−1 were found to increase with fictive temperature and to decrease with increasing OH content. The results suggest that water in the melt is preferentially trapped at the defect sites. T…
A two-parameter tight-binding theory of the electronic structure of 4:2-coordinated materials is proposed. The parameters, a covalent and a polar energy, are fitted to the optical absorption spectra. The valence energy bands and density of states are calculated. In terms of these a consistent interpretation of all the…
The exact Landau level structure of graphite has been obtained for the magnetic field parallel to the c -axis with the aid of the numerical calculation. Special emphasis is layed on the effect of the trigonal warping in band structure which has been treated approximately up to the present. The peculiar behaviour of La…
The crystal structures of a number of copper selenides have been re-examined using X-ray powder diffraction intensity data. |F 0 | values for Cu 1•8 Se at room temperature (a = 5.765 Å) are satisfied by a model based on space group Fm3m with 4 Se atoms per unit cell on the fcc sites, 5.2 Cu atoms on the tetrahedral si…
The Slater-Koster linear-combination-of-atomic-orbitals (LCAO) interpolation method is applied to fit the results of nonrelativistic augmented-plane-wave (APW) calculations at symmetry points in the Brillouin zone for several metallic transition-metal dioxides with the rutile structure, namely, ${\mathrm{RuO}}_{2}$, $…
The conduction threshold which occurs in resistor networks when a certain fraction has zero conductivity can be treated as a sort of critical point. This critical point is also relevant to mixtures of resistors with finite conductivities a and b, in the limit a<<b. A homogeneous function representation is proposed for…
The thermal diffusivity of polycrystalline BN has been measured from 100 to 800K using a 'flash' technique; published specific heat data have been used to evaluate the thermal conductivity. Over a limited temperature range the results have been confirmed by steady-state measurements. The results have been compared wit…
The thermal conductivity of composites made from epoxy-resin Epikote 828 with metal-powder fillers has been measured from 1.7 to 300K. The metals were Cu, Ag, Au, Al, Sn, Pb, stainless steel and bronze, and in almost all cases the particles were spherical or rounded. At 20K and above the thermal conductivity is indepe…
The classical theory of Brownian motion applies to suspensions which are so dilute that each particle is effectively alone in infinite fluid. We consider here the modifications to the theory that are needed when rigid spherical particles are close enough to interact hydrodynamically. It is first shown that Brownian mo…
Plasmon dispersion and anisotropy in the metallic polymer ${(\mathrm{SN})}_{x}$ were investigated directly by electron-energy-loss spectroscopy. A positive dispersion relation was observed for plasmons propagating along the polymer-chain $b$ axis. As the plasmon wave vector changes from parallel to perpendicular to th…
It has been shown that for the reaction catalyzed by "biodegradative" L-threonine dehydratase from E. coli strains K-12 and 980 in 0.5 M phosphate-carbonate buffer, pH 8.4 and pH 9.5, the plots of initial reaction rate (v) versus the initial substrate concentration ([S]0 are characterized by several inflection points,…
Article Recrystallization Kinetics as Observed in the Photoemission Electronmicroscope / Rekristallisationskinetik im Photoemissions-Elektronenmikroskop beobachtet was published on March 1, 1976 in the journal International Journal of Materials Research (volume 67, issue 3).
Purification was conducted on polyvinyl alcohol (PVA) degrading enzyme produced and secreted into the culture medium by Pseudomonas O–3 strain. The enzyme was found to separate into several fractions by ion-exchange chromatography and gel filtration. Among these fractions, a fraction adsorbed to SP-Sephadex C–50 at pH…
Article Phase Equilibria and Interdiffusion in the Cobalt-Titanium System / Phasengleichgewichte und Diffusion im System Kobalt-Titan was published on March 1, 1976 in the journal International Journal of Materials Research (volume 67, issue 3).