Materials Literature
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Oxygen plays a very important role in the magnetic properties of R-Fe-B-type alloys. As the oxygen content increases in Nd-Fe-B and Nd-Dy-Fe-Al-B alloys, the alloys gradually lose their magnetic and thermomagnetic properties: the Hci decreases and both the temperature coefficient of Hci and the irreversible temperatur…
Fe-rich and RE-containing phases with the ThMn12 structure show interesting intrinsic magnetic properties. The single-phase composition Fe80Mo12Sm8 has a saturation magnetization of 10 kG, a Curie temperature of about 200 °C, and an anisotropy field of about 90 kOe, with the saturation magnetization and the Curie temp…
Ultrafine subdomain particles of NiFe2O4, Ni0.5Zn0.5Fe2O4, and CoFe2O4 were prepared under mild hydrothermal conditions by precipitating from metal nitrates. Magnetic and Mössbauer effect measurements revealed the superparamagnetic nature of these ferrite particles. The crystallite sizes were in the range 5.0–20.0 nm…
High field magnetization and magnetoresistance of YbB 12 are investigated up to 550 kOe at low temperatures with special interest in the semiconductive band gap energy under the field. Very large negative magnetoresistance is found and the system is perfectly metallic around 500 kOe with anomalous increase in the magn…
A new process has been developed to produce high-energy bulk Pr-Fe-B magnets directly from the melt without the handling of magnetic powder or powderlike ribbons. The process mainly consists of only three steps—casting/hot pressing/annealing—and minimizes the oxygen contamination of magnets. A typical composition of c…
Experimental data are reported for depolarized and fully polarized components of the Raman spectra of variably ordered states of a-Ge and a-Si films. These spectra are compared to theoretical Raman calculations for relaxed Polk-model-derived structures with different degrees of bond-angle disorder. In addition, the ex…
Simple relations between protonic conductivity ($\ensuremath{\sigma}$) and the peak wave number (${\ensuremath{\nu}}_{\mathrm{OH}}$) of O-H infrared absorption band, and between activation energy for the electrical conduction and the wave number (${\ensuremath{\nu}}_{\mathrm{OH}}$) were found in oxide glasses containi…
Common mode choke cores using the new Fe-based alloys called ‘‘FINEMET’’ composed of ultrafine grain structure were developed. These new cores show high attenuation to high-voltage pulse noises and good attenuation characteristics over a wide frequency range. Accordingly, the new cores are expected to be applied in ma…
Undoped ZnO crystals exhibit a large variety of bound-exciton luminescence lines, due to the efficient exciton binding to chemically and structurally different neutral impurity centers. This offers an excellent possibility to identify excited states and excitation channels of these systems by comparing various bound-e…
Sm(Fe1−xMx)12 ternary compounds based on the tetragonal ThMn12 structure where M is Ti, Si, V, Cr, and Mo were investigated. M atoms have a preference for site occupation. Ti atoms occupy the 8i or 8j site and Cr atoms occupy the 8i site. Curie temperatures on Sm(M,Fe)12 compounds are around 590 K except for the SmMo2…
Commercial scale production of a Fe-6.5 wt. % Si sheet has been successfully developed. Presently manufactured sheets are in coil form, whose thickness ranges from 0.1 to 0.5 mm with a maximum width of 400 mm. Magnetic properties of the manufactured sheet have been investigated. The permeability of Fe-6.5 wt. % Si she…
ZnO:Al coatings were prepared by rf magnetron sputtering of ZnO together with dc magnetron sputtering of Al onto rapidly revolving unheated substrates under weakly oxidizing conditions. Optimized films had ∼1% luminous absorptance, ∼85% thermal infrared reflectance, and ∼5×10−4 Ω cm electrical resistivity at a thickne…
Quantum-size effects of an electron-hole system confined in microcrystals of semiconductors are studied theoretically with the spherical-dielectric continuum model. An extensive numerical calculation for the eigenvalue problem is carried out by Ritz's variational technique. The motional state of the lowest level is cl…
Defect formation in dehydrated silica glasses was investigated using various excimer lasers with different energies. The ArF laser (6.4 eV) generates the E′ center more effectively than the KrF laser (5.0 eV), while the XeCl laser (4.0 eV) generated no centers. Defect generation was found to be proportional to the squ…
In Part one, the formation and development of leader filaments in large air-gap discharges are studied by Schlieren techniques. The time evolution of the thermal diameter of the leader at a given point in space is studied for several gap spacings ranging from 1 to 16.7 m and for different wave forms and voltage levels…
The electrosynthesis of metalloporphyrins which contain a metal-carbon σ-bond is reviewed in this paper. The electron transfer mechanisms of σ-bonded rhodium, cobalt, germanium, and silicon porphyrin complexes were also determined on the basis of voltammetric measurements and controlled-potential electrooxidation/redu…
The optical and nonlinear optical properties of 2-(N-prolinol)-5-nitropyridine (PNP) have been investigated. The refractive indices show strong dispersion and high birefringence in the spectral range from 488 to 1064 nm. At 632 nm the main refractive indices are nx=1.990, ny=1.788, and nz=1.467. The two major nonlinea…
The optical susceptibilities of CdSxSe1−x -doped glasses were observed up to χ(11) using a spatially resolved phase-matched multiwave mixing technique. Using a pulsed dye laser tuned near the band gap, measurements were performed for ‖χ(3)‖, ‖χ(5)‖, and ‖χ(7)‖ in four different commercial filter glasses.
We report the first measurements of elastic coefficients and viscosities that clearly demonstrate the distinction between rigid and semiflexible behavior of a main-chain polymer nematic liquid crystal, a solution of poly-$\ensuremath{\gamma}$-benzyl glutamate (PBG) in mixed organic solvents. Quasielastic Rayleigh scat…
We have investigated characteristics of polycrystalline diamond thin films formed by plasma-enhanced chemical vapor deposition method on silicon substrates using Raman spectroscopy, analytical and high-resolution transmission electron microscopy techniques. Grains with average size 1 μm in diameter were observed in th…