Materials Literature
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There is a well-known correlation between the shape of the relaxation function (nonexponentiality) and the temperature-dependence of the relaxation times (e.g., fragility), with broader relaxations associated with steeper Tg-normalized temperature dependences. Herein, exceptions to this correlation are described. Five…
Silicon-rich silicon oxide films were deposited by plasma-enhanced chemical vapor deposition. Energy was released into the film by ion bombardment, with the aim of promoting formation of Si nanoclusters and reordering the oxide matrix. The effect of the initial stoichiometry, as well as the evolution of the oxide film…
Complex [(La0.7Sr0.3MnO3)m(SrTiO3)n] [(LSMO)m/(STO)8]15 superlattices with different layer thicknesses (m=5, 8, 12, 16, 32) have been prepared using pulsed liquid injection metalorganic chemical vapor deposition. Transmission electron microscopy and electron diffraction reveal a very clear and well-separated layer seq…
The effect of hydrogen, carbon, and oxygen impurity atoms on the structure of gas-phase and zeolite-supported Rh 6 clusters was studied computationally with a gradient-corrected density functional method. Measured metal−metal distances of Rh 6 clusters on zeolite support were 10−20 pm longer than the optimized distanc…
RAIRS experiments have been performed to investigate the adsorption of NO on Pt{211}. Results show that adsorption is complex and strongly temperature dependent. At 307 K, three bands are seen at saturation with frequencies of 1801, 1609, and 1576 cm -1 . However, at 120 K only two bands, at 1688 and 1620 cm -1, are o…
We have measured electrical and magnetic properties of single crystals of Sb2−xMnxTe3 with x=0–0.045 at temperatures of 2 K to 300 K. Hall effect measurements indicate that each manganese atom donates approximately one hole to the valence band. The magnetic susceptibility is paramagnetic down to 2 K, and both Curie–We…
Abstract For Abstract see ChemInform Abstract in Full Text.
Lanthanum calcium oxoborate is a nonlinear optical material that belongs to the calcium-rare-earth (R) oxoborate family, with general composition of Ca4RO(BO3)3 (R3+=La,Sm,Gd,Lu,Y). X-ray photoemission was used to study the valence band electronic structure and surface chemistry of this material. High resolution photo…
Field-effect transistors (FETs) based on an individual CNx/C nanotube (NT) were fabricated by focus ion-beam technology. The nanotube transistors exhibited n-type semiconductor characteristics, and the conductance of nanotube FETs can be modulated more than four orders of magnitude at room temperature. The electron mo…
We present the results of a systematic investigation of the thermal conductivity, Seebeck coefficient and electrical resistivity for selected members (x=0.3, 0.7, 0.8, and 1) of the LaNi1−xCoxO3 solid solution in the temperature range of 80⩽T⩽320 K. Substitution of Ni by Co drives the system from n-type metallic phase…
Fast relaxation processes in the structural glass and glassy crystal of ethanol as well as in the glassy crystal of cyano cyclohexane were studied by quasielastic light scattering (LS). Depolarized and polarized LS spectra together with the Brillouin line were measured applying a tandem Fabry–Perot interferometer at f…
Abstract The wettability of high‐density polyethylene grafted with methacrylic acid is strongly influenced by the nature of the grafting solvent. Here, the wettability is expressed by the water contact angle and absorbency. The initial (10‐s) contact angle of polyethylene (PE) grafted in acetone/water solution decreas…
Epitaxial SrTiO3 (STO) films were fabricated on CeO2/yttria-stabilized zirconia(YSZ)/Si(001) substrates by the insertion of a TiO2 atomic layer by pulsed-laser deposition. X-ray diffraction and reflection high-energy electron diffraction showed that epitaxial STO films with different out-of-plane orientations have bee…
Selective formation of the single-phase nanoclusters of Cu2O on SrTiO3(100) substrates in the size range of 10–50 nm is found to occur only in a very narrow oxygen plasma-assisted molecular-beam epitaxy growth parameter window, in comparison with the bulk phase diagram (for oxygen pressure versus temperature). There a…
Highly oriented ionic conductor gadolinium-doped CeO2−δ (Ce0.8Gd0.2O2−δ) thin films have been grown on single-crystal (001) MgO substrates by pulsed-laser ablation. The films are highly c-axis oriented with cube-on-cube epitaxy, as shown by x-ray diffraction and electron microscopy. The interface relationship is, surp…
The phase diagram of the ${\mathrm{AB}}_{p}{C}_{1\ensuremath{-}p}$ ternary alloy consisting of Ising spins ${S}^{A}=\frac{3}{2},$ ${S}^{B}=1,$ and ${S}^{C}=\frac{5}{2}$ in the presence of a single-ion anisotropy is investigated by the use of a mean-field theory based on the Bogoliubov inequality for the Gibbs free ene…
Raman-scattering spectra of Ge-filled and Sn-filled CoSb3 were studied as a function of polarization. Polarized Raman-scattering spectra of CoSb3 were used to help distinguish the symmetry of each vibrational mode observed in the filled skutterudite specimens. Seven out of the eight Raman-active Sb vibrational modes o…
Nanocrystalline diamond films were synthesized by microwave plasma-enhanced chemical vapor deposition using Ar/H2/CH4 gas mixtures. A Fluke PM6306 RCL meter was used to study the electrical impedance of these diamond films in the frequency range 50 Hz to 1 MHz. The impedance dispersion measurement yields the real and…
We report the fabrication of field-effect transistors on single crystals of the highly anisotropic organic semiconductor tetramethyltetraselenafulvalene. We find maximum mobilities of 0.2 cm2/V s at room temperature. We observe an exponential decrease of mobility with decreasing temperature with an activation energy 1…
Abstract Thermoplastic polyurethanes were synthesized from poly(propylene glycol)‐ block ‐poly(ethylene glycol) polyols and hybrid hard segments that combined at least two different chain extenders. The combination of hard segments allowed for modification of elastomer performance and processing not achievable by any…