Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Optical experiments on free-standing liquid crystal films which address the issues of structural ordering, fluctuations in two dimensions and enhanced surface ordering will be reviewed. Also, results on a novel electrohydrodynamic mode will be presented.
By appropriate variation of starting composition we demonstrate that melt-spun materials comprised primarily of Nd2(CoxFe1−x)14B and having optimum energy products can be prepared. Twelve cobalt concentrations spanning the entire cobalt substitution range have been investigated. We report ambient as well as elevated t…
We report picosecond photoinduced bleaching (PB) of the exciton absorption of the emeraldine base form of polyaniline. The temperature- (T-) independent dispersive decay, \ensuremath{\sim}${t}^{\mathrm{\ensuremath{-}}0.11}$, observed in this study differs markedly from the dynamics of earlier studied semiconductors. I…
A Fabry–Perot interferometer system was used to measure the free-surface velocity of α-alumina powder compact. In situ pressure profile measurements using a pair of manganin gauges were also carried out to clarify the compaction process during compression and stress release. The Fabry–Perot system indicates that the r…
Diffusion coefficients of hydrogen have been measured in disordered ${\mathrm{Ti}}_{1\mathrm{\ensuremath{-}}\mathrm{y}}$${\mathrm{V}}_{\mathrm{y}}$ alloys, as a function of temperature, hydrogen concentration, and alloy composition. Diffusion and electron microprobe analysis data indicate the existence of short-range…
Precise results of first-principles electronic-structure calculations of the structural and electronic properties of the binary compound LiAl are presented for the bcc-based B32 and B2 crystal structures, the fcc-based L${1}_{0}$ and the simple-cubic-based B1 structures as obtained with the full-potential linearized a…
Measurements of the swelling pressure ω̄ and shear modulus Gs in a set of poly(vinyl acetate) networks swollen to different degrees in toluene and in acetone are reported, using solutions of the uncross-linked polymer to obtain deswelling under known conditions of osmotic pressure. The swelling pressure can be complet…
High-resolution resistivity and magnetoresistance measurements have been performed as a function of temperature on pregraphitic carbon fibers. The resistivity exhibits a negative temperature coefficient (d\ensuremath{\rho}/dT<0) from room temperature down to 1.5 K. It is shown that such behavior can hardly be expla…
Three-dimensional computer simulation is carried out for the aggregation process of colloids using the sticky sphere model proposed in the previous paper. Time evolution of the structure of aggregates and macroscopic viscosity is studied when a shear flow is started in a suspension of the sticky spheres. In the transi…
During directional solidification of thin layers (50 μm) of the transparent CBr 4 -C 2 Cl 6 lamellar eutectic alloy, we observed tilt waves, a type of instability consisting in small domains of tilted lamellae moving transversely along the growth front. This instability is a way the system adjusts its wavelength after…
Plasmon broadening in small metal clusters is calculated using the jellium model. We find that thermal fluctuations in the shape of the cluster could be a significant source of broadening of the Mie resonance. The shape fluctuation mechanism makes definite predictions for the shape of the resonance line, its temperatu…
Measurement of a photoinduced reaction involving two types of molecular species coadsorbed with well-defined configurations on a solid surface is reported. The photoinduced reaction, occurring on Pt(111) at 100 K, is O2+CO+hν→O+{O→CO}→O+CO2. A mechanism involving photochemically produced hot O atoms (with high transla…
The characteristic features of structure factor Sm(Q) of liquid halogens F2, Cl2, Br2, and I2 have been discussed in terms of preferred orientational correlations introduced between the nearest neighbors. The orientational correlations estimated directly from the experimental Sm(Q)’s of these liquids are rather simila…
Electrical conduction in amorphous ${\mathrm{In}}_{\mathrm{x}}$${\mathrm{Se}}_{100\mathrm{\ensuremath{-}}\mathrm{x}}$ (a-${\mathrm{In}}_{\mathrm{x}}$${\mathrm{Se}}_{100\mathrm{\ensuremath{-}}\mathrm{x}}$) thin films is examined, where x ranges from 35 to 44. Models of electrical conduction processes in both crystallin…
[FeCl(C44H28N4)], Mr = 704.03, monoclinic, P21/n, a = 10.254 (2), b = 15.969 (3), c = 20.810 (4) A, beta = 90.48 (2) degree, V = 3407.7 A3, Z = 4, Dx = 1.37 g cm-3, Mo K alpha, lambda = 0.71073 A, mu = 5.6 cm-1, F(000) = 363, T = 293 K, R = 0.047 for 3357 unique observed reflections. The iron(III) ion is coordinated t…
Compressibility, optical-absorption, Raman-scattering, and refractive-index measurements for GaSe are reported at 300 K and pressures up to 8 GPa. A model which separates intra- and interlayer contributions along the c axis is used, with adequate deformation potentials, to quantitatively reproduce the compressibility…
The temperature dependence of the magnetic susceptibilities and the magnetizations for the three kinds of α-nitronyl nitroxides, 2-R-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy 3-oxide [with R=phenyl (I), 3-nitrophenyl (II), 4-nitrophenyl (III)] have been measured. It is found that the intermolecular spin inte…
Plasma-induced self-healing in organic dielectrics, which is of extremely great importance for capacitor technology, is dependent, in a complicated manner, upon electrical and physicochemical processes, which cannot be determined by metrology. Accordingly, a theoretical model was developed which describes the spatiote…
Flexoelectric effect in cholesteric liquid crystals can be used to produce optical switching on a microsecond time scale. In a simple geometry, this effect produces a light modulation the amplitude of which is linear in field. The switching time from one optical state to the other is predicted to be independent of the…
Luminescence at energy lower than the absorption edge has been investigated in crystals of GaSe, containing different degrees of lattice disorder, as a function of temperature, of photoexcitation intensity, and of excitation energy. At low excitation intensity, the extrinsic luminescence is composed of broad overlappi…