Materials Literature
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The transmittance of an anodic alumina film changes significantly with the refractive index of the guest material that is contained in columnar pores. We fabricated a channel waveguide with a Y junction in an alumina film by filling the pores with photocurable resins of suitable refractive indices.
Single layer films of FeTaN have been deposited by dc magnetron sputtering, and the relationships between the magnetostriction and film composition have been studied. A linear increase in magnetostriction with nitrogen content has been explained by the dependence of λ100 on nitrogen concentration. The form of this dep…
The hard magnetic properties of nitrided melt-spun Nd-Fe-Mo ribbons have been investigated as functions of composition, quench rate, and nitriding time. Ingots having the compositions Nd1Fe10Mo2, Nd1.15Fe10Mo2, Nd1.3Fe10Mo2, and Nd1.45Fe10Mo2 were melt spun over a range of quench rates specified by substrate wheel vel…
The hyper Rayleigh scattering (HRS) method was applied to determine the absolute value of second-order hyperpolarizabilities ((beta) ) of stilbazolium p-toluenesulfonates and related ionic species in methanol. In general, the (beta) values of stilbazolium derivatives become large with increasing wavelength of absorpti…
Relaxation of a stepped (111) diamond surface is studied using an accurate, total-energy tight-binding method. We determined that the bare surface will become ${\mathit{sp}}^{2}$ bonded near a step. This spontaneous graphitization is accompanied by a large increase in spacing between the surface layers. Band structure…
Scattering theory has been used to determine the effect of various defects on the scattering loss of As2S3 glass fibers. The scattering is related to the particle shape, size, relative refractive index, and wavelength of light. Bubbles possess the highest relative refractive index and therefore the highest scattering…
Crystalline barium ferrite films with in-plane magnetic anisotropy have been obtained by postdeposition annealing of amorphous sputtered films. The magnetic properties, the crystallographic texture, and the microstructure are very sensitive to the sputtering and postdeposition annealing conditions. It was found that b…
Mixed Li–Cd ferrites having the chemical formula Li0.5−x/2CdxFe2.5−x/2O4 (where x=0.2, 0.4, 0.6, 0.8, and 1.0) are prepared by the well-known double sintering ceramic technique. From x-ray diffraction studies lattice parameters are calculated and their variation with composition is explained on the basis of the tetrah…
The dynamic response of liquid crystalline polymers at high shear rates has been studied by measuring shear and normal stresses during transients following a step in the shear rate. Stepwise increase and decrease as well as flow reversals have been investigated. A solution of poly(benzylglutamate) (PBG) in m-cresol is…
Pb-substituted Ba-ferrite films were prepared at various substrate temperature Ts by dc magnetron sputtering and their crystallographic characteristics and magnetic properties were investigated. The substitution of Pb facilitates the crystallization and improves the crystallinity for hexagonal M phase. All of the film…
We report high magnetic field magnetization measurements of the ferromagnetic compounds Sm2Fe17, Sm2Fe17N3, Sm2Fe17D5, and Pr2Fe17, Pr2Fe17N3 performed up to 200 kOe in continuous field. We present isothermal magnetization curves measured at 4.2 and 300 K on oriented powder samples. The M(H) curves show that the axial…
The spatially local and long wavelength properties of diblock copolymer melts are studied using the polymer reference interaction site model theory. Two new molecular based closure approximations, the ‘‘reference-molecular mean spherical approximation’’ (R-MMSA) and the ‘‘reference-molecular Percus–Yevick’’ (R-MPY) ap…
Electrical conductivity, magnetic susceptibility, and electron-spin-resonance studies are reported in polyaniline and its derivatives poly(o-toluidine), poly(o-ethylaniline), and poly(o-propylaniline). It is shown that substituents on the ${\mathrm{C}}_{6}$ rings of the polymer backbone lead to decreased conductivity,…
Fe3O4 thin films were reactively sputtered onto 〈100〉 and 〈110〉 MgO substrates. X-ray diffraction data indicate single crystal Fe3O4 films under a tensile stress. Magnetization data show good agreement with bulk Fe3O4 for Ms, but also show the presence of a large anisotropy component manifest in the lack of saturation…
Infrared emission from highly vibrationally excited NO2, prepared by collision induced internal conversion, can be detected with 1 cm−1 spectral and 0.5 μs time resolution over the 800–10 000 cm−1 range by time-resolved Fourier transform emission spectroscopy. The energy distribution of vibrationally excited NO2 durin…
The Krätschmer–Huffman carbon-arc method of preparing fullerenes has been used to generate carbon-coated transition metal (TM) and TM-carbide nanocrystallites. The magnetic nanocrystallites were extracted from the soot with a magnetic gradient field technique. For TM=Co the majority of nanocrystals exist as nominally…
The equilibrium properties of block copolymer liquids are studied using liquid state theory. We first present the formal extension of the polymer reference interaction site model theory to treat block copolymers of general architectures, and then apply this to the symmetric block copolymer using the Gaussian thread mo…
The frequency dependent first hyperpolarizabilities βvec(−2ω;ω,ω) (second harmonic generation) of conjugated molecules are studied using the time-dependent Hartree–Fock theory with the inclusion of solvent effects treated with the self-consistent reaction field theory. Using the intermediate neglect of differential ov…
M-type barium ferrite (BaFe12O19) films were deposited on a ZnO underlayer by sputtering with mixture of Ar, Xe, and O2 gases. PO2 and PAr+Xe were set at 0.01 and 0.09 Pa, respectively, where PXe was changed from 0.00 to 0.09 Pa. The dependencies of surface morphology, 〈D〉, Δθ50, Ms, and Hc⊥ and Hc∥ on PXe were invest…
The interpretation of various magnetization curves through Henkel plots and Δm plots has become popular in recent years for characterization of interactions in hysteresis. To investigate this approach, we have calculated Henkel plots using a hysteresis model based on independently moving domain walls. A variety of dem…