Materials Literature
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The kinetics of solid-HDDR (hydrogenation, disproportionation, desorption, recombination) processing of Nd-Fe-B-type alloys have been characterized by means of in situ electrical resistivity measurements and hydrogen absorption and desorption studies on nondecrepitated samples. The fundamental differences in reaction…
Abstract An ESR method was used to study the structure of the macroradical of the propagating chain R p in the low‐temperature, solid‐phase polymerization of p ‐diethynylbenzene (DEB). The ESR spectra for γ‐irradiated DEB samples and those of DEB deuterated in the ethynyl group showed that in the range 77–230 K, the u…
Addition of tungsten (1–2 at. %) is very effective in improving coercivity of (Nd,Dy)-(Fe,Co)-B sintered magnets both at room temperature and elevated temperatures in addition to improving thermal stability. Transmission electron microscopy shows that there exists a WFeB precipitate phase inside the Nd2Fe14B (2-14-1)…
The Fe57 Mössbauer spectra of Sm2Fe17−xAlx, where x=0, 1.0, 2.0, 3.0, and 4.0, have been measured at room temperature and analyzed. The ternary compounds Sm2Fe17−xAlx have the rhombohedral Th2Zn17 structure. Mössbauer measurements showed that all the compounds studied were ferromagnetic. The average hyperfine field wa…
Raman scattering spectra of PbTe films, grown by laser-assisted deposition on a KCl substrate, containing the metastable GeS-type phase of PbTe, are investigated at different temperatures in the range 64--300 K. The Raman-active modes of the orthorhombic GeS-type phase of PbTe are detected in the low-temperature spect…
In previous work it was discovered that the 2:17-type rare-earth–iron compounds with high carbon concentration could be formed by the substitution of Ga, Si, or Al, etc., for Fe in R2Fe17Cx. The effect of Al substitution for Fe on the structure and magnetic anisotropy of Sm2Fe17C has been investigated. Alloys with the…
The structure of the fully protonated hexamolybdoplatinate polyanion salt K 2 [H 6 α-PtMo 6 O 24 ] . 5H 2 O has been determined from X-ray diffraction data. This polyanion has a center of symmetry and protonation of the O atoms is different from that of heteropolyanions having the socalled Anderson structure, [X n+ (O…
The absorption of hydrogen by NdFeB alloys in aqueous solution has been investigated using dc electrochemical methods and x-ray diffraction. Immersion of the NdFeB alloy in 0.1 M H2SO4 results in the formation of the Nd2Fe14BH2.7 hydride phase as indicated by x-ray diffraction analysis. The hydrogen entering the NdFeB…
Highly anisotropic SmCo based films with the TbCu7-type structure have been sputter deposited directly onto YIG substrates. The SmCo crystallites have the c axes approximately randomly splayed about the substrate plane such that the easy direction of magnetization of the SmCo film is in the film plane. The in-plane st…
The compound SmCo4B is a hard magnetic material; however, the saturation moment and the Curie temperature need to be increased for the compound to be a candidate for a permanent magnetic material. For this purpose, Fe substitution for the Co and Pr substitution for the Sm of SmCo4B have been attempted. In addition, th…
The structural and magnetic properties of the thermally activated transformation from nanostructural material, mechanically disordered and decomposed BaFe12O19 ferrite powder to pure crystalline phase, have been studied by x-ray diffraction, scanning electron microscopy, and vibrating sample magnetometry analysis tech…
We have studied the effect of Al substitution in Nd2Fe17 compound by means of first-principles calculations. We first obtain the site-decomposed potentials for Fe from self-consistent calculation on Y2Fe17 and the atomiclike potentials in the crystalline environment for Al and Nd. Calculations are carried out for a si…
The structure of H 8 Si 8 O 12 has been determined by neutron diffraction at 29 K and compared with X-ray determinations at 9.5 and 100 K. There are only small geometrical differences, but it can be concluded that the deviation from the ideal molecular symmetry, O h (m3m), increases with decreasing temperature and tha…
GaAs(110) and (100) wafers are reacted with ${\mathrm{XeF}}_{2}$ at room temperature and studied with soft-x-ray photoelectron spectroscopy (SXPS), photon-stimulated desorption (PSD) and electron-energy-loss spectroscopy (EELS). The reaction between GaAs and ${\mathrm{XeF}}_{2}$ results in the homogeneous growth of a…
Using a model cubic anharmonic crystal potential and Fermi's golden rule, an expression for the anharmonic relaxation time for a nonequilibrium long-wavelength LO phonon is rigorously derived. Decay times for various bulk, alloy, and quantum-well semiconductor systems are calculated. Comparison with time-resolved Rama…
A systematic investigation of electron spin resonance (ESR) properties, the spin susceptibility (χ spin ), peak-to-peak linewidth (Δ H pp ) and g -value, of κ-type BEDT-TTF superconductors has been carried out in order to clarify their electronic structures in the normal state. κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br (Space gro…
The viewing angle, contrast ratio, and response time of a negative birefringent film-compensated homeotropic liquid-crystal cell were evaluated. A spin-coated polyimide film was found to cancel the phase retardation of the liquid-crystal cell over a wide range of incident angle. Such a film-compensated homeotropic liq…
Excitonic properties have been studied in cubic ${\mathrm{Zn}}_{0.42}$${\mathrm{Cd}}_{0.58}$S lattice matched to GaAs. At 2 K, the time-integrated photoluminescence spectrum was composed of single emission peaking at 2.863 eV and its LO-phonon replica. The linewidth of the main peak was 18.5 meV, which fairly well agr…
Abstract The effect of presence of water on the transport of oxygen through films of Nylon‐6 was evaluated at 5, 23, and 40°C by permeation experiments. Through the oxygen permeability experiments it was found that the diffusion of oxygen through Nylon‐6 is not a simple Fickian process and the total diffusion process…
High-temperature phase relations in the Fe-rich corner of the Nd-Fe-Ti ternary alloy system have been investigated and an equilibrium phase diagram has been constructed at 1100 °C. Arc-melted and annealed alloys of systematically varying compositions were characterized utilizing scanning electron microscopy, an energy…