Materials Literature
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The synthesis and optical properties of a series of amorphous polyesters with amino-sulfone azobenzene chromophores in the main chain are presented. The condensation of alkyl diacid chlorides with 4-[(2-hydroxyethyl)ethylamino]-4′-(2-hydroxyethylsulfonyl)azobenzene (7) gave polymers that showed low and unstable photoi…
We clarified here an epitaxial growth mechanism of ZnO(0001) surface on an atomic scale, by using molecular-dynamics crystal-growth simulations. It was observed that the crystal growth starts at the step of ZnO(0001), but not at the terrace of ZnO(0001). This phenomenon is clearly justified from the coordination numbe…
The electronic specific heat of partially deuterated organic conductors $\ensuremath{\kappa}\ensuremath{-}{(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}{\mathrm{Cu}[\mathrm{N}(\mathrm{CN})}_{2}]\mathrm{B}\mathrm{r},$ [where BEDT-TTF denotes bis(ethylenedithio)tetrathiafulv…
Using a quasi one-dimensional extended Peierls-Hubbard model, we theoretically study the photoinduced ionic-neutral structural phase transition in an organic molecular chain crystal TTF-CA, by means of the adiabatic approximation and the mean-field theory. This model includes strong intra-chain Coulomb interactions wh…
Polarized reflectivity spectra of single crystals of $\ensuremath{\alpha}\ensuremath{-}{\mathrm{PbF}}_{2},$ $\ensuremath{\beta}\ensuremath{-}{\mathrm{PbF}}_{2},$ ${\mathrm{PbCl}}_{2},$ and ${\mathrm{PbBr}}_{2}$ have been measured at 10 K in the energy range up to 30 eV using synchrotron radiation as a light source. Th…
We reconsider the theory of dc and ac interchain conductivity in quasi-one dimensional systems. Our results are in good agreement with the measured c-axis optical conductivity of ${(\mathrm{TMTSF})}_{2}{\mathrm{ClO}}_{4}$ and suggest that the c-axis dc conductivity of ${(\mathrm{TMTSF})}_{2}{\mathrm{PF}}_{6}$ in the $…
Classical molecular dynamics simulations are used to model the bombardment of a bundle of single walled carbon nanotubes by ${\mathrm{CH}}_{3}$ radicals impacting with incident energies of 10, 45, and 80 eV. The simulations show that there is a high probability of adhesion of either the radicals or their fragments to…
Single crystals of ${\mathrm{BaLu}}_{2}{\mathrm{F}}_{8}$ doped with 0.6% ${\mathrm{Nd}}^{3+}$ were studied by high-resolution optical absorption, luminescence, and excitation spectroscopy in the 15--300 K temperature range. The two crystallographically distinct sites for the dopant ions present in this host are identi…
The aim of this work is to investigate the origin of the piezochromism and thermochromism exhibited by the copper oxide ${\mathrm{CuMoO}}_{4}.$ These optical phenomena are associated with structural phase transition (PT) from the triclinic $\ensuremath{\alpha}$ (green) modification to the $\ensuremath{\gamma}$ (browni…
Ferroelectric ceramics when driven under high electric field have their ferroelectric properties modified due to the polarization reorientation, which induces the fatigue effect or domain depinning process. The self-heating process is another important characteristic that can be observed in this situation. In this wor…
The formation of carbonaceous clusters in ion-irradiated polymer films was investigated extensively. Information about these clusters may be obtained with ultraviolet–visible (UV–vis) spectroscopy. The optical band gap (Eg), calculated from the absorption edge of the UV spectra of these polymers, can be correlated to…
The structure of oxygen adsorbed on Ir{100} has been determined by density functional theory slab calculations and quantitative low energy electron diffraction. The two studies produce essentially identical results, experiment providing a benchmark for the first principles calculation, while the latter provides a more…
The microstructures of a Nd8Fe76.5Co8B6Nb1Cu0.5 nanocomposite magnet have been investigated by transmission electron microscopy and three-dimensional atom probe microanalysis. The ribbon prepared by the single roller melt-spinning process under an optimal cooling rate was partially crystallized, being composed of α-Fe…
We have investigated, crystal and magnetic structure of conducting double perovskite transition metal oxide, Sr 2 FeMoO 6 , which has been grown by the floating-zone method. The resisitvity shows T 2 -dependence in a wide temperature range (50–350 K), perhaps due to magnon scattering. We further have determined the cr…
Scanning tunneling spectroscopy is used to investigate single InAs nanocrystals, 20--70 \AA{} in diameter, in a highly asymmetric double barrier tunnel junction configuration. The $I\ensuremath{-}V$ characteristics reflect contributions of both single-electron charging and the atomiclike level structure of the quantum…
Moir\'e contrast between monolayer graphite and Pt(111) lattices is observed in local tunneling barrier height (LBH) images, where LBH's are calibrated with quasistatic $I\ensuremath{-}z$ measurements. The observed Moir\'e amplitude of 1.6 eV, much larger than the possible maximum amplitude due to the electronic inter…
The presence and concentration of nitrogen and hydrogen impurities in thick diamond films grown by microwave plasma chemical vapor deposition at various H2 gas flow rates, keeping a constant [CH4]:[H2]=2.5% concentration ratio, have been determined by electron spin resonance and optical absorption spectroscopy. The re…
In this article we report on the atomic displacement parameters, lattice expansions, heat capacity, and thermal conductivity of samples of Ti4AlN3 in the 298–1370 K temperature range. Rietveld refinement of high temperature neutron diffraction data shows that the nitrogen is substoichiometric and the formula is Ti4AlN…
Ceramics with composition Ba 1- x Na x Ti 1- x Nb x O 3 are of either classical ferroelectric (for 0 ⩽ x < 0.075) and ferro- or antiferroelectric (for 0.55 < x ⩽ 1) or relaxor ferroelectric type (for 0.075 ⩽ x ⩽ 0.55), the transition at T c being only diffuse without any frequency dispersion for this last region. All…
Sterically stabilized biocompatible poly(lactic acid) (PLA) nanospheres were prepared by an o/w emulsion/evaporation technique, using hydrophobically modified dextrans (DexP) as the emulsion stabilizer. Photon correlation spectroscopy, zetametry, and differential scanning calorimetry studies corroborated that interfac…