Materials Literature
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In the series of ordered DO3 solid solutions Fe3−xMnxSi, field-induced transitions have previously been found to occur for antiferromagnetic alloys with values of x near 1.70. The present work has determined a region of composition in which antiferromagnetism is the low-field, low-temperature state and gives the varia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared Studies of the Microdomains and Mesomorphic Properties of 4'-Cyano-4-biphenyl [4-(4-pentenyloxy)]benzoate Coated on SilicaY. W. Zhou, M. Jaroniec, and R. K. GilpinCite this: Anal. Chem. 1994, 66, 22, 4100–4104Publication Date (Print):November 15, 1994Publication His…
The gypsum-type structure of the title compound, weinschenkite [churchite(Y)], is confirmed. The H-atom positions could not be located. The structures of gypsum [Cole & Lancucki (1974). Acta Cryst. B30, 921929], CaSeO 4 . 2H 2 O [Kruger & Abriel (1991). Acta Cryst. C47, 1958-1959] and weinschenkite are isotypic. Howev…
The potassium salt containing the [H 4 β-PtMo 6 O 24 ] 4− polyanion, which has approximate 2mm symmetry (bent structure), has been isolated and its structure determined by single-crystal X-ray diffraction. This polyanion is an isomeric form of the 3m (flat-structure) species
Electronic energy bands of metallic ${\mathrm{TiTe}}_{2}$ are calculated, and the transport masses (n/m${)}_{\mathrm{\ensuremath{\alpha}}\mathrm{\ensuremath{\beta}}}$ are evaluated. Comparison with the measured resistivity shows that this is an ordinary metal with a moderate electron-phonon interaction in the usual qu…
We have fabricated Ni filaments by nickel precipitation into a porous silicon matrix, making Ni filaments of about 200 Å in diameter and 30 μm in length separated by ∼500 Å silicon walls. This composite material demonstrates strong magnetic anisotropy perpendicular to the surface due to shape anisotropy of the Ni fila…
We have developed a novel Lagrangian–Eulerian numerical scheme to model the dynamics of dense hard-disk suspensions with many-body hydrodynamic interactions in an incompressible Newtonian solvent. A simple derivation of analytical solution of lubrication force between disks is given. Reasonable agreement of viscosity…
We report a systematic analysis of the crystal-field spectra of four fluoride compounds containing tetravalent actinide ions. The first part of this work [J. Chem. Phys. 95, 7194 (1991)] provided interpretation of the absorption spectra of UF4, NpF4, and PuF4. To extend our analysis to heavier elements of the series,…
Electron microscopy and initial magnetization studies at elevated temperatures were performed on two die-upset rare-earth magnets with bulk compositions Nd13.75Fe80.25B6 and Pr13.75Fe80.25B6. In both compositions the intergranular phase is amorphous and occurs primarily on those surfaces parallel to the tetragonal 2-1…
The effect of changing stress on the magnetization of ferromagnetic materials leads to behavior in which the magnetization may increase, or decrease, when exposed to the same stress under the same external conditions. A simple empirical law seems to govern the behavior when the magnetization begins from a major hyster…
Abstract New strategies for the synthesis of perfectly alternating segmented polyimide‐polydimethyl siloxane copolymers were developed by utilizing a transimidization method. Imide oligomers endcapped with 2‐aminopyrimidine were reacted with aminopropyl terminated (dimethyl siloxane) oligomers to afford perfectly alte…
Electronically conductive polymers can be synthesized within the pores of microporous membranes to yield microscopic tubules of the polymer. We have investigated the temperature dependence of resistance of thin films prepared from microtubules composed of polyaniline and polypyrrole. All resistance data obtained follo…
Magnetization and magnetostriction in amorphous binary TbFe and DyFe and amorphous and polycrystalline, ternary (TbxDy1−x)yFe100−y thin films have been investigated. The measurements reflect the compositional dependence of the easy direction of magnetization in the films. In plane magnetostrictions of over 300×10−6 we…
The inverted hysteresis loop is claimed to be possible, in an exchange-coupled bilayer, when a magnetically soft material is affected by the demagnetizing field of the hard material. These demagnetizing fields are caused by the charge on the surfaces, neglected in all the theories that assume a strictly one-dimensiona…
We report on soft-x-ray photoelectron spectroscopy (SXPS) of a ${\mathrm{TiO}}_{2}$(110) surface during deposition of Fe in the monolayer regime. At low fractional monolayer coverages, the adsorbed Fe atoms are oxidized and Ti cations at the interface become reduced due to Fe adsorption. SXPS from shallow core levels…
By means of a Green-function, volume-integral-equation approach we study numerically the scattering of a surface plasmon polariton at a planar vacuum-metal interface by dielectric and metallic defects that are either embedded in the metal substrate or are situated in the vacuum region on the substrate. We calculate th…
Controversy about the magnetic properties of α″-Fe16N2 thin films makes it desirable to examine bulk material. In the original preparation and crystal structure determination of α″ in 1951, N-austenite (γ) prepared by nitriding α-iron powder at 700–750 °C was quenched to give N-martensite (α′) which then gave α+α″ on…
Using both primary- and tertiary-structure comparisons, we have established new structural similarities shared by reductases, epimerases and dehydrogenases not previously known to be related. Despite the low sequence identity (down to 10%), short consensus segments are identified. We show that the sequence, the active…
The half-metallic ferromagnetic compounds due to the absence of states at EF for minority spin electrons, as predicted by band theory, should exhibit unique features in their transport properties. Transport measurements conducted as a function of T and H for NiMnSb and PtMnSb thin films show interesting behavior. In H…
A study of the adsorption of sulfur on the GaAs(100) surface after in situ thermal desorption of a protective As capping layer is presented. The sulfur flux was generated by the decomposition of silver sulfide in an UHV-compatible electrochemical cell. Use of As-capped samples provided a means to study the interaction…