Materials Literature
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On the basis of the anionic group theory, a new nonlinear optical crystal cesium triborate, (CsB3O5, CBO) was discovered. Single crystals of CBO in centimeter size were grown from a stoichiometric melt. The transparent range of CBO covers from 170 to 3000 nm. The preliminary measurement of its second harmonic generati…
Abstract Thin polymeric films were deposited from siloxane plasma on the surface of polyethylene. The surface composition of the films was measured by X‐ray photoelectron spectroscopy (XPS) and the permeability to O 2 by an analytic gas permeability fractometer. No significant improvement of barrier to O 2 was observe…
Presents the fundamental science needed to understand the classification of materials and the limits of their properties in terms of temperature, strength, ductility, corrosion and physical behaviour, while emphasizing materials processing, selection and property measurement methods.
Can one protein sequence encode two structures? Oxidative folding of human insulin-like growth factor 1 (IGF-1), a globular protein of 70 residues, is shown to yield two products of similar thermodynamic stability. This observation is of particular interest in light of the recent demonstration that two of the three di…
Angle-resolved photoemission spectroscopy has been employed to study in situ intercalation of the layered compound ${\mathrm{VSe}}_{2}$ with Cs. The results show that the valence band structure of ${\mathrm{VSe}}_{2}$, which initially is of 3D character, is transformed to become essentially 2D upon Cs intercalation. T…
We have made a detailed pressure--magnetic-field--temperature phase diagram study of the organic conductors (TMTSF${)}_{2}$${\mathrm{PF}}_{6}$ and (TMTSF${)}_{2}$${\mathrm{ClO}}_{4}$ in the low temperature regions dominated by the cascade of field-induced spin density wave (FISDW) transitions. The ${\mathrm{PF}}_{6}$…
We present a theory of stripe domain structures in a thin ferromagnetic film with easy-axis magnetic anisotropy and long-range dipole interactions, for a wide range of temperatures below the reorientational phase transition. Spatial anisotropy generated by the exchange energy within domain walls pins the orientation o…
Two dilute alloys with nominal compositions Cu—1.2%Fe2Ti and Cu—0.8%FeTi are studied in the temperature range 500 to 950 °C by electrical conductivity measurements and by transmission electron microscopy (TEM) and field ion microscopy (FIM). Under equilibrium conditions, the two alloys are located in the fields (“Cu”…
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…