Materials Literature
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The statistical distribution function for dislocation link lengths in a unit volume of plastically deformed crystalline materials as proposed by Wang et al. is used to derive the relationship between the average dislocation link length, 〈γ〉, and the dislocation density, Q. It is shown that 〈γ〉 = βϱ−½: β = (2/πc)½ wher…
The Co82−xFexZr18 (0≤x≤16) alloys melt-spun with vs=40-47 m/s exhibit a single phase for all x. The Curie temperature Tc and the room-temperature saturation magnetization σs increase monotonically with increasing Fe concentration x. The anisotropy field for x=0 is found to be about 3.13T. In the as-quenched samples at…
Epstein-frame loss measurements were performed on 3.2% Si-Fe nonoriented strips cut along and transverse to the rolling direction, in the frequency range 10–100 Hz and at various peak inductions between 0.3 and 1.6 T. The behavior of hysteresis loss Ph and excess loss Pe vs peak induction B and frequency f was worked…
Sm2Fe17Nx is of considerable current interest as a permanent-magnet material because of its enhanced Curie temperature and uniaxial anisotropy. The electronic structures of Sm2Fe17Nx for x=0 and x∼2.6 have been studied with photoemission and spin-polarized calculations. The materials are prepared by arc melting and ni…
Abstract It is shown how a characterization of unfilled, amorphous rubber networks can be evaluated from uniaxial stress‐strain measurement data. Beside the cross‐linking density, the relative scission probability during the curing procedure is evaluated, which determines the amount of dangling free chain ends and the…
A magnetostrictive torque sensor which can be installed in an automobile transmission to measure torque has been developed. The sensor shaft consists of two grooved sections. An ac bridge circuit formed by two coils surrounding the grooved sections and two fixed resistors is used to detect torque. The shaft material i…
Ferrimagnetic NixFe1−xCr2S4 is found to crystallize with a pure spinel structure in the composition range 0≤x≤0.4. 57Fe Mössbauer spectra of NixFe1−xCr2S4 have been taken at various temperatures ranging from 13 K to room temperature. Analysis of Mössbauer spectra and x-ray crystallographic data indicate that Ni ions o…
Recently a heat-proof magnetic domain refining technique has been developed which is characterized by the introduction of grooves on a surface of steel sheet after final cold rolling. In this paper, magnetic properties and the domain refining effect of grooving are investigated. A grooving process is constituted by re…
Hexagonal barium ferrite films have been grown on microcrystalline carbon substrates for the first time and thermally oxidized SiO2/Si wafers using dc facing targets sputtering. Si3N4 and SiO2/Cr underlayers were effective in preventing carbon diffusion into the barium ferrite films during deposition at high temperatu…
The compound Mn3Ga (70–74 at.% Mn) has the hexagonal DO19-type structure, and a triangular antiferromagnetic spin structure with a weak ferromagnetic component below the Néel temperature of about 470 K. Below 170 K the hexagonal structure is distorted to an orthorhombic one, accompanied by a steep increase in the ferr…
Mössbauer studies were carried out at 77 K in two series of R2Fe17 compounds with a magnetic (Sm) and nonmagnetic (Y) rare-earth, intercalated with H, C, and N. The increase in hyperfine field is largest at the 12j(18f) sites for R2Fe17H3.7 and R2Fe17N2.3. While the lattice expansion in R2Fe17C2 is similar to that in…
The physical properties of the copper polyaniline vermiculite intercalation compound [Cu(PANI)-VIC] have been studied by x-ray diffraction, electrical resistivity, and dc-magnetic-susceptibility measurements. Aniline is intercalated into the interlamellar space of Cu-VIC, where the ${\mathrm{Cu}}^{2+}$ ions act as oxi…
Raman-scattering spectroscopy has been used to study the folded longitudinal-acoustic (FLA) phonons in three- and four-layer superlattices comprised variously of slabs of GaAs, ${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Al}}_{\mathit{x}}$As, and AlAs. For each superlattice, the observed FLA peak fre…
We study the magnetic properties of soft ferromagnetic cores in the low field linear regime at low temperature (T≤4.2 K) in view of their use in connection with superconducting quantum interference device magnetometers. We have tested several amorphous and polycrystalline alloys in the form of strip-wound toroidal cor…
Thin films of Ba-hexaferrite of the magnetoplumbite structure have been prepared on sapphire substrates of orientation (112̄0), (11̄02), and (0001). Torque magnetometry indicates easy axes parallel, tilted off parallel, and perpendicular to the substrate for the A-, R-, and C-plane substrates. X-ray diffraction shows…
Abstract By means of reflection‐absorption infrared spectroscopy, interfacial interactions were studied between hydrated aluminium and two ethylene copolymers, poly(ethylene‐c‐butyl acrylate) (EBA) and poly(ethylene‐c‐acrylic acid) (EAA). The hydrated aluminium surfaces were obtained by immersion in boiling water, whi…
Remanence studies in recent years have used the characteristics of the Henkel plot and the delta-M plot in the interpretation of interaction field effects in particulate magnetic media. Studies of these two plots in ordered BaFe coatings, however, indicate that both plots give inadequate description of interaction fie…
Moving-type Preisach-derived models computing both the irreversible and the locally reversible components of the magnetization accurately characterize magnetic recording materials exhibiting hysteresis. Experimental results show that the derivative of the major remanent loop is not a symmetrical function of the applie…
Al substitution effects on the magnetic properties of RCo5 (R=Y, Pr, Nd, and Sm) are studied on the basis of magnetic measurements for RCo5−xAlx with x less than 2. The Al substitution considerably decreases the Curie temperature, the Co-sublattice moment, the magnetocrystalline anisotropy of the R sublattice as well…
Amorphous SmCo films were sputter synthesized at room temperature in the presence of strong in-plane magnetic fields. Both in-the-film-plane and perpendicular anisotropy could be formed in the films depending upon the film preparation conditions. Post deposition annealing in the presence of in-plane magnetic fields di…