Materials Literature
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The novel concept of a “symmetry switch” for spin transfer is proposed. EHT and INDO calculations on a series of iron(III) porphyrin complexes indicate that factors that can contribute to the stability of the intermediate-spin state can be explained clearly with crystal-field theory. A decrease in symmetry causes the…
Macrocyclic structures such as 1 and rings with different polar substituents pointing inwards can be prepared by the intramolecular Glaser coupling of tetraacetylenes held covalently in position around a temporary template.
In situ, time-resolved energy-dispersive X-ray diffraction has been used to investigate the formation of the mesoporous silicates FSM-16 and MCM-41. The data suggest that the silica−surfactant mesophases formed are highly dependent on the reactant medium, the effect of the silica source being one of the main determini…
The formation of grid-type inorganic architectures of [2×2], [3×3], and [4×4] size (depicted here) occurs by self-assembly from lead(II) ions and ligands containing tridentate binding sites. Well-defined inorganic architectures of high complexity may thus be obtained in a single overall step by a spontaneous but contr…
Carbon-encapsulated Sn−Pb nanowires are generated by electrolysis of graphite in molten LiCl containing these metals. SA-EDX analyses indicate a distinctive profile for the metal cores in which Sn predominates at one end and Pb at the other of the individual nanowires; X-ray diffraction measurements reveal that separa…
The chemical dynamics of highly vibrationally excited molecules have been studied by measuring the quantum state-resolved scattering probabilities of nitric oxide (NO) molecules on clean and oxygen-covered copper (111) surfaces, where the incident NO was prepared in single quantum states with vibrational energies of a…
Time-resolved in situ X-ray diffraction measurements have been used to measure the rate of intercalation of lithium salts (LiX; X = Cl, Br, NO 3, OH, and SO 4 ) into Gibbsite (γ-Al(OH) 3 ) giving the layered double hydroxides [LiAl 2 (OH) 6 ]X· n H 2 O (X = Cl, Br, NO 3, and OH) and [LiAl 2 (OH) 6 ] 2 SO 4 · n H 2 O.…
The formation of SAMs on oxides and semiconductor surfaces has become a significant issue recently in its various technological applications. We report an easy and convenient method for the tailoring of an ITO surface with an amine functional group. A dense self-assembled monolayer of 1,12-diaminododecane was formed o…
Organic molecular Mott insulators, in which carriers are localized as a result of the electron correlation, showed nonlinear electric conduction upon application of a high electric field along the molecular stacking axis. The current-driven low-resistive state of potassium 7,7,8,8-tetracyanoquinodimethanane was stabil…
A Zr−Ce mixed oxide with ca. a 1:1 atomic ratio is prepared by a microemulsion method and studied by X-ray diffraction, transmission electron microscopy, and Raman, X-ray photoelectron (XPS) and electron paramagnetic resonance (EPR) spectroscopies. The results show the formation of a high surface area material ( S BET…
We show that a simple rate-and-state theory accounts for most features of both time-independent and time-dependent plasticity in a spatially inhomogeneous situation, specifically, a circular hole in a large stressed plate. Those features include linear viscoelastic flow at small applied stresses, strain hardening at l…
We show that the NLS systems with multiplicative noise, nonlinear damping and nonlocal dispersion exhibit a variety of interesting effects which may be useful for modelling the dynamical behavior of one- and two-dimensional molecular systems.
The equilibrium shapes and energies of coherent strained InP islands grown on GaP have been investigated with a hybrid approach that has been previously applied to InAs islands on GaAs. This combines calculations of the surface energies by density functional theory and the bulk deformation energies by continuum elasti…
Using magnetic neutron scattering we characterize an unusual low temperature phase in orthorhombic SrCuO2. The material contains zigzag spin ladders formed by pairs of S=1/2 chains (J=180 meV) coupled through a weak frustrated interaction |J'|<0.1J. At T
The effects of pyrolysis and annealing conditions on the orientation of PZT thin films prepared by Sol-Gel process have been investigated. The influence of the interface behaves between Ti and Pt formed at different heat treatment conditions on orientation of final PZT thin films was emphasized in this paper. The rela…
A fractal-percolation model describing the stability of foam is studied. In this model, a correspondence is established between the system of branched channels and a fractal tree. In the proposed model, the foam breaks down by a scale-invariant load-transfer mechanism. A formula is obtained for calculating the height…
GeTe, SnTe, and PbTe have been prepared by chemical transport reactions with iodine as transport agent in the temperature range between T 2 (800 - 700°C) and T 1 (700 - 500°C). The effective transport equilibria were determineted. Total pressure measurements in the system Ge- Te-I give the coexistence equlibria for co…
Differential scanning calorimetry on powders and x-ray diffraction on single crystals of $({\mathrm{CH}}_{3}{)}_{4}\mathrm{NSCN}$ reveal a cell-doubling cubic-to-orthorhombic ${(O}_{h}^{1}\ensuremath{\rightarrow}{D}_{2h}^{13})$ ferroelastic transition at 181 \ifmmode^\circ\else\textdegree\fi{}C. This transformation is…
The two ternary phases W 5 As 2.5 P 1.5 and Ni 4 Nb 5 P 4 have been investigated by X-ray powder diffraction. Precise data for the two compounds were collected using Cu K α 1 radiation over the range 11°–140° 2θ. Unit cell refinements (space group I 4/ m ) led to a =9.4729(3) Å, c =3.2414(2) Å ( D x =13.16 g cm −3 ) w…
Many transformers using low Tc or high Tc superconductors have been built and tested, but it is still not clear how to design the volt/turn ratio property. This paper shows one design method, which minimizes total cost including initial cost and running cost. According to the results, the optimized volt/turn will be a…