Materials Literature
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The Hubbard-Holstein model is studied at half filling in one dimension using a variational method based on the variable-displacement Lang-Firsov canonical transformation and the exact solution to the Hubbard model due to Lieb and Wu. It is usually believed that the system undergoes a direct insulator-to-insulator tran…
The crystal structure of Ti(2)P has been analysed using electron diffraction and high-resolution electron-microscopy techniques. A new unit cell was found, the compound is hexagonal with a = 19.969 (1) and c = 3.4589 (1) A. The structure was first solved in space group P-62m in projection using direct methods on elect…
Consider faceting of a crystal surface caused by strongly anisotropic surface tension, driven by surface diffusion and accompanied by deposition (etching) due to fluxes normal to the surface. Nonlinear evolution equations describing the faceting of 1+1 and 2+1 crystal surfaces are studied analytically, by means of mat…
We discuss a closure of a polymer chain released from a state with given end-to-end distance. Considering the situation as a first passage problem for a non-Markovian process, we express the survival probability through the three-time distribution of the end-to-end distance and evaluate it numerically by solving a Vol…
A lanthanide/organic radical based molecular magnet (Tc=3.5 K) has been prepared from a reaction of GdCl3⋅6 H2O with Li[TCNQ] (TCNQ=7,7,8,8-tetracyanoquinodimethane). The title compound was structurally characterized by single-crystal X-ray diffraction and contains distinct anionic and cationic (see picture) networks…
Abstract Die Wissenschaft wird wie die Kunst und Architektur von den faszinierenden Formen und Mustern der Natur beeinflusst. Die Mechanismen, die zu organischen, anorganischen und bioorganischen Strukturen führen, wurden in der Physik und Biologie intensiv erforscht, aber auch die Chemie interessiert sich für die Kon…
The Co(hfa)2·2H2O (hfa = CF3C(O)CHC(O)CF3) precursor was used in MOCVD experiments to deposit cobalt oxides, on optically transparent SiO2 substrates. CoO and Co3O4 films have been obtained depending on the adopted deposition conditions. XRD measurements provided evidence that CoO consists of cubic, (100) oriented cry…
Interplay of nonlinear and quantum effects in the ground state of the E$\otimes (b_1+b_2)$ Jahn-Teller model was investigated by the {\it variational approach and exact numerical simulations}. They result in the recognition of (i) importance of the admixture of {\it the first excited state of the displaced harmonic os…
This is an informal paper that contains a list of ``things we know'' and ``things we do not know'' in manganites. It is adapted from the conclusions chapter of a recent book by the author, {\it Nanoscale Phase Separation and Colossal Magnetoresistance. The Physics of Manganites and Related Compounds}, Springer-Verlag,…
Thermal decomposition of W(CO)6 in oleylamine in the presence of mild oxidant Me3NO.2H2O produces tungsten oxide nanorods with diameters ranging from 3 to 6 nm. The size of nanorods can be easily varied by the employed surfactant ratio or reaction temperature. The prepared tungsten oxide nanorods exhibit strong photol…
Mankind's fascination with shapes and patterns, many examples of which come from nature, has greatly influenced areas such as art and architecture. Science too has long since been interested in the origin of shapes and structures found in nature. Whereas organic chemistry in general, and supramolecular chemistry espec…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract Inelastic electron tunneling spectra of Pb/MnPSe 3 /Pb junctions are measured below liquid helium temperature in the normal state of lead under an external magnetic field. The insulating barrier of MnPSe 3 , an antiferromagnetic layered transition metal phosphorous triselenide, is cleaved from a single crysta…
This article deals with the cold plasma treatment of atactic polystyrene (aPS) and isotactic polystyrene (iPS) thin films with oxygen, oxygen-nitrogen mixture or nitrogen. Experimental results showed that the use of a DC pulsed plasma discharge at low pressure can considerably increase surface hydrophilicity. Variatio…
Abstract For Abstract see ChemInform Abstract in Full Text.
A highly homogeneous and dispersed K-Co-Mo/C catalyst which prepared by a sol-gel method exhibits high alcohol yield, especially high C2+ OH selectivity for mixed alcohol synthesis from CO + H2.
Treatment of [Ti(O-i-Pr)(2)Cl(2)] with NaL(OEt) (L(OEt)(-) = [CpCo[P(O)(OEt)(2)](3)](-), Cp = eta(5)-C(5)H(5)) afforded [L(OEt)Ti(O-i-Pr)(2)Cl] that reacted with HCl in ether to give [L(OEt)TiCl(3)] (1). The average Ti-O and Ti-Cl distances in 1 are 1.975 and 2.293 A, respectively. Reaction of titanyl sulfate with NaL…
Sb K-edge extended x-ray-absorption fine-structure spectroscopy has been used to determine the coordination environment of ${\mathrm{Sb}}^{3+}$ ions in a wide range of ${\mathrm{Sb}}_{2}{\mathrm{O}}_{3}{\ensuremath{-}M}_{x}{\mathrm{O}}_{y}$ glasses $(M=\mathrm{Si},$ Ge, B, and As) with ${\mathrm{Sb}}_{2}{\mathrm{O}}_{…
The composition dependence of the optical and structural properties of Ge1-xSix nanocrystals is investigated by means of ab initio total-energy and electronic-structure calculations. A trimodal distribution of the Ge-Ge, Ge-Si, and Si-Si bond lengths is found. The pair-excitation energies and the Stokes shift are calc…
High yields (typically 95%) of highly ordered cubic (rhombic dodecahedral) crystals of MCM-48 mesoporous silica can be obtained from simple cetyltrimethylammonium hydroxide (CTAOH)–SiO2–H2O systems in which the CTAOH functions as the structure director and also controls the pH of the synthesis gel.