Materials Literature
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The measurements of thermoelectric powers and current–voltage characteristics were made on the p- and n-type Si specimens which were doped with 0.1 at. % of Al and P, respectively. The apparent Seebeck coefficients Sa of these specimens were measured using various kinds of metal electrodes at cold end and the brass at…
A 0D vanadium borophosphate [Co(en)(3)](2)[V(3)P(3)BO(19)][H(2)PO(4)].4H(2)O (1) and two 1D vanadium oxides [Co(en)(3)][V(3)O(9)].H(2)O (2) and [Co(dien)(2)][V(3)O(9)].H(2)O (3) have been synthesized hydrothermally from the reaction mixture of V(2)O(5)-H(3)PO(4)-H(3)BO(3)-CoCl(2)-R-H(2)O at 110 degrees C (R: en or die…
The p-type (Bi0.25Sb0.75)2Te3 doped with 8 wt % excess Te and 0.3 wt % Se and the n-type Bi2(Te0.94Se0.06)3 doped with 0.08 wt % SbI3, 0.02 wt % Te, and 0.01 wt % CuBr were grown by the Bridgman method at a rate of 6 cm/h. The thermoelectric properties of these specimens were measured before and after annealing, where…
Silicon nanocrystals embedded in a thin oxide layer can be used as charge storage elements in nonvolatile memory devices. The structural characteristics of the nanocrystals and their position in the oxide determine the electrical properties of the devices. In this work, silicon nanocrystals have been formed by ultralo…
Multispin tunneling cross relaxations in an ensemble of weakly coupled Ho3+ ions, mediated by weak anisotropic dipolar interactions, can be evidenced by ac-susceptibility measurements in a high temperature regime. Based on a four-body representation, including the rare-earth nuclear spin, two-ion tunneling mechanisms…
The electric field poling process of nonlinear optical chromophores embedded in an amorphous polymer matrix was studied using molecular dynamics (MD) simulations. Three systems were considered, consisting of a poly(methyl methacrylate) matrix doped with the following chromophores: N, N -dimethyl- p -nitroaniline (DPNA…
This paper studies self-assembly of a rigid oligomer, polyimide (PI) with carboxyl ends, and a proton-accepting polymer poly(4-vinylpyridine) (PVPy) or poly(styrene- co -4-vinylpyridine) (SVP) in solutions. It was found that these rigid/coil polymer pairs could form submicrometer hollow spheres in their common solvent…
Interface and defect structures of Zn–ZnO core–shell nanobelts have been investigated using high-resolution transmission electron microscopy. Most of the nanobelts can be classified into two types from their growth directions: [21̄1̄0] and [0001], with the top/bottom surfaces being (0001) and (21̄1̄0), respectively. T…
Abstract Fibers of PA9‐T, a new semiaromatic polyamide containing a long aliphatic chain, were prepared by melt spinning. As‐spun fibers were subsequently drawn with a CO 2 laser‐heated drawing system at different draw ratios and various drawing velocities. On‐line observations of drawing points deciphered two drawing…
Abstract The increasing interest in negative‐index metamaterials requires a formulation capable of a full analysis of wave propagation in such materials. Since two‐dimensional (2D) problems have been largely explored in the literature, the natural step is a three‐dimensional (3D) formulation of a metamaterial. In this…
Expedient five-step syntheses of a cyclic bis(benzimidazole)-based amide 5 and two sterically more hindered analogues 23-24 have been developed. These amides are chiral due to the inherent ruffling of the macrocyclic plane. Racemization of the optical antipodes of these compounds has been studied using dynamic chiral…
The goal of this work was to study the effect of storage time on the functional properties of glutenin films plasticized with selected hydrophilic low molecular weight compounds: glycerol (GL), triethanolamine (TEA), and sorbitol (S). Glutenins were extracted from wheat gluten, and films were cast from film-forming so…
Pb(Zr 0.52 Ti 0.48 ) O 3 / LaNiO 3 (PZT/LNO) heterostructural thin films have been fabricated on LaAlO3 (LAO) single crystal substrates in the range of oxygen pressures from 50 to 400 mTorr by pulsed laser deposition. X-ray diffraction analyses reveal that the films grow with the good relationships PZT(001)//LNO(001)/…
The mechanism of energy transfer from silicon nanocrystals (nc-Si) to erbium ions (Er3+) in SiO2 films containing nc-Si and Er was studied by analyzing delayed infrared luminescence from Er3+. It was found that, to theoretically reproduce the rising part of the time-dependent luminescence intensity, two different ener…
Controlled purification of the CdSe nanocrystal primitive solution critically affects the electrophoretic deposition of these nanocrystals. Film morphology is optimized after two precipitation steps with no TOPO/TOP added in either step. This suggests the need to minimize impurities in the solution or to remove a cont…
For certain combinations of temperature and magnetic field, the evolution with time of the magnetization of some phase-separated manganese oxides exhibits a unique steplike feature. This jump in the magnetization is proposed to correspond to a burstlike growth of the ferromagnetic fraction at the expense of the antife…
We use exact diagonalization combined with mean-field theory to investigate the phase diagram of the spin-orbital model for cubic vanadates. The spin-orbit coupling competes with Hund's exchange and triggers a novel phase, with the ordering of t(2g) orbital magnetic moments stabilized by the tilting of VO6 octahedra.…
Stabilization of a perovskite-type solid solution (1−x) PbTiO3–x BiScO3 with x⩾0.45 was demonstrated by high-pressure synthesis, and the phase diagram and the ferroelectric properties of the solid solution were investigated. The crystal symmetry of the perovskite subcell change in turn from tetragonal, to rhombohedral…
Liquid-feed flame spray pyrolysis (LFFSP) of metalloorganic [N(CH 2 CH 2 O) 3 Al, alumatrane, and Al(Acac) 3 ] and inorganic alumina [AlCl 3 and Al(NO 3 ) 3 ·9H 2 O] precursors dissolved in 1:1 ethanol/THF, aerosolized with O 2 and ignited can produce quite different alumina nanopowders during the ensuing combustion p…
The adsorption of individual atoms on the semiconducting and metallic single-walled carbon nanotubes (SWNT) has been investigated by using the first principles pseudopotential plane wave method within density functional theory. The stable adsorption geometries and binding energies have been determined for a large numb…