Materials Literature
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The redetermination of the structure of the title compound, Co2P2O7, agrees with the results previously reported by Krishnamachari & Calvo [Acta Cryst. (1972), B28, 2883–2885], but with improved precision.
In this work, extensive thermo-Raman investigations have been carried out on a γ(L)-Bi 2 MoO 6 sample (`(L)' indicating the low-temperature polymorph) in an effort to gain an understanding of the structural evolution and phase transformation involved during a dynamical thermal process. The room temperature Raman spect…
A new kinetic model of kaolinite dehydroxylation is proposed in order to take into account data obtained by gravimetry at 450 °C under controlled water vapour pressure ranging from 2.5 to 10 mbar. This model involves a process of random nucleation and anisotropic growth of nuclei. Under the above experimental conditio…
A series of MFI supported bimetallic catalysts with high Co/Pd ratios and high metal loading was prepared by first subliming CoBr2 vapor onto H/MFI, followed by ion exchange of some Pd from an aqueous solution of Pd(NH3)4(NO3)2. They were tested for NO reduction with CH4 in the presence of 2% O2. Best performance was…
A novel synthesis of uranium tetraboride (UB(4)) by solid-state metathesis reaction is demonstrated. This approach significantly lowers the temperature required to synthesize this material to < or = 850 degrees C. When UCl(4) is reacted with 2 equiv of MgB(2) at 850 degrees C, crystalline UB(4) is formed. Powder X-ray…
Photoluminescent porous silicon has been produced in a variety of etchants using laser-assisted etching of silicon without an applied potential. Porous silicon (por-Si) produced from etchants containing K +, Cs +, or Rb + can have cubic crystallites of hexafluorosilicate on top of and embedded in the porous silicon fi…
Spectroscopic ellipsometry (SE) has been used to monitor the time-dependent process of swelling of phosphorylcholine (PC) biocompatible polymer films of different initial dry film thicknesses. Factors including the extent of silyl cross-linker, ratio of hydrophilic and hydrophobic moieties, annealing temperature, and…
We present a detailed investigation of the low-frequency dielectric response of the charge-density-wave system (CDW) $o\ensuremath{-}{\mathrm{TaS}}_{3}$ in wide temperature (5--300 K) and frequency (10 mHz to 100 MHz) ranges. Although our measurements agree relatively well with data performed in some restricted freque…
This article surveys some results concerning motion by mean curvature (MMC) for curves and surfaces. Emphasis will be put on methods of incorporating stochastic noise. In addition, we will demonstrate the idea of using noise to provide a selection principle for non-unique solutions.
In the present paper, an analysis of the energy gap ${E}_{\mathrm{gap}},$ work function X, lattice constant L, and some other characteristics of the tetrahedral diamondlike crystals was performed in the framework of tight-binding band-structure theory. Comparison with experimental data for diamondlike carbon films ill…
The pressure dependence of the Raman-active modes of the rare-earth aluminium garnet compounds (RE 3 Al 5 O 12 , RE: Tb, Dy, Tm, Yb, Lu) has been measured at room temperature and discussed in terms of the rigid-ion model (RIM). The Raman modes in the high-frequency region (ω>650 cm -1 ) exhibit systematically larger p…
Self-consistent density functional theory based on a direct supercell approach is reported for Zn 1- x Mg x Se pseudobinary alloy. The calculation includes, in a natural way, atomic relaxation and self-consistent charge transfer, hence providing a link between the electronic structure and the interaction energies whic…
Stable surface nanostructures with different morphology have been successfully constructed by modifying the chemical structure of synthetic amphiphiles; by introducing mesogenic groups into bolaform amphiphiles, stable spaghetti-like or stripe-like nanostructures can be obtained; it is believed that such a kind of sur…
Reactions between the Os(VI)-nitrido complexes, [OsVI(L2)(Cl)3(N)] (L2 = 2,2'-bipyridine (bpy) ([1]), 4,4'-dimethyl-2,2'-bipyridine (Me2bpy), 1,10-phenanthroline (phen), and 4,7-diphenyl-1,10-phenanthroline (Ph2phen)), and bis-(triphenylphosphoranylidene)ammonium azide (PPNN3) in dry CH3CN at 60 degrees C under N2 giv…
Ab initio calculations on (10,10) and (12,12) single-wall carbon-nanotube bundles show that the nature of the phase transformation under hydrostatic pressure is determined by the symmetry of the nanotubes. Bundles of (10,10) nanotubes that are incommensurate with the hexagonal lattice, have small deviations from hexag…
We present a density functional study of zigzag carbon nanotubes containing potassium atoms inside. We find that the effect of potassium doping is not simple charge transfer. The nearly free electron state of nanotube couples with the $\mathrm{K} 4s$ orbital. The state comes downward as the tube is thicker and crosses…
The reaction of 2-(dimethylamino)phenylhydroxamic acid (2-dmAphaH) with NiSO(4).6H2O gives the complex [Ni7(2-dmAphaH-1)2(2-dmApha)8(H2O)2]SO(4).15H2O uniquely exhibiting four distinct hydroxamate binding modes, two of which are novel, and showing both antiferromagnetic and ferromagnetic interactions in contrast to [C…
We introduce the density-matrix renormalization-group method as an efficient computational tool for one-exciton approximations with off-diagonal disorder (single-particle problems). This method allows us to reduce the computational effort by targeting only a few low-lying eigenstates at each statistical sampling, in c…
The problem of the observable equilibrium domain structure (DS) in pure antiferromagnets is investigated with the use of continuous elasticity theory. It is shown that the difference between the bulk and surface magnetoelastic strains causes imaginary `incompatibility elastic charges' analogous to the surface `magneti…
We study the linewidth of the surface plasmon resonance in the optical absorption spectrum of metallic nanoparticles, when the decay into electron-hole pairs is the dominant channel. Within a semiclassical approach, we find that the electron-hole density-density correlation oscillates as a function of the size of the…