Materials Literature
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The ionic-conductivity (\ensuremath{\sigma}) and electric-modulus (${M}^{\mathrm{*}}$) data for melt-grown Na \ensuremath{\beta}-alumina in the ${10}^{2}$--${10}^{7}$-Hz frequency range have been previously interpreted with a formalism in which the decay of an observable, such as the time-dependent electric field in t…
Conventional grain-oriented silicon steels 0.3 mm thick were cold-rolled to thicknesses from 0.18 to 0.08 mm, and the magnetic properties and grain textures of these sheets were observed before and after annealing. The results indicated that the magnetic induction B8 and the coercive force Hc were 1.8 T and 25 A/m, re…
The hot working conditions were examined for Nd-Fe-B die-upset magnets. The Nd14Fe80B6 ternary composition has the best workability (die upsetting) from stress-strain curves for the initial stage of die upsetting at hot working temperature. The compression ratio defined as the inverse of reduction in height should be…
The large values of remanence observed in isotropic melt-spun R-Fe-Al-B-Si samples have been investigated by correlating the magnetic properties with the microstructure. Transmission electron microscope studies showed that the highest values of reduced remanence mR are obtained in samples with very fine Nd2Fe14B-type…
The pressure dependence of the HOMO–LUMO transition energy and the frequency of the longest wavelength longitudinal optical vibration of 45 Å diameter CdSe clusters in methanol–ethanol solution have been measured up to 50 Kbar. The LO mode shifts to higher frequency at a rate of 0.43 cm−1/Kbar, which corresponds to a…
Fragile glass-forming liquids are characterized by strongly non-Arrhenius temperature dependence of shear viscosity, and by unusually high heat capacity in the supercooled liquid above the glass transition. Using the inherent structure formalism, a theoretical model is developed to explain these characteristics. The v…
A time-of-flight inelastic neutron scattering study of Ca 0.4 K 0.6 (NO 3 ) 1.4 of the temperature dependence of the dynamic structure factor revealed a clear frequency-independent signature of the glass transition at the conventional transition temperature T g . Above T g the data combined with our previous neutron s…
A number of Nd15 Fe79−x Mgx B6 magnets with x up to 0.41 and pseudoternary Nd2(Fe1−yMgy)14B compounds with y up to 0.081 have been prepared by conventional powder metallurgy processes. Magnetic measurements indicate that for the magnet alloys i Hc increases as x increases up to 0.25 without a loss in Br, hence the (BH…
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…