Materials Literature
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A high-frequency (95 GHz) electron paramagnetic resonance (EPR) study is reported on single crystals of the planar tetranuclear complex Fe 4 (OCH 3 ) 6 (dpm) 6 (where Hdpm = dipivaloylmethane), which has been previously shown to present typical single-molecule magnet behavior. The spectra, all originating from the S =…
For electron transport in parallel-plane semiconducting structures, a model is developed that unifies ballistic and diffusive transport and thus generalizes the Drude model. The unified model is valid for arbitrary magnitude of the mean free path and arbitrary shape of the conduction band edge profile. Universal formu…
We study the dielectric response of ferroelectric (FE) thin films with the ``dead'' dielectric layer at the interface with electrodes. The domain structure inevitably forms in the FE film in the presence of the dead layer. As a result, the effective dielectric constant of the capacitor ${\ensuremath{\epsilon}}_{\mathr…
Tissue engineering is the construction, repair or replacement of damaged or missing tissue in humans and other animals. This engineering may take place within the animal body or as tissue constructs to be made in a bioreactor for later grafting into the animal. The minimal set of materials for this are the appropriate…
In conventional nuclear experiments a beam of accelerated nuclei collides with a target nucleus that is surrounded by other nuclei in a molecule, in condensed matter, or in a plasma environment. It is shown that for low collision energies possible nuclear reactions (including deuterium fusion) are strongly boosted by…
Quantum Monte Carlo simulations of interacting electrons in solids often use Slater-Jastrow trial wave functions. The Jastrow function takes into account correlations between pairs of electrons. In simulations of solids, it is common to use a Jastrow function which is both homogeneous and isotropic. The use of a homog…
Taking the pseudobinary C15 Laves phase compound Ce(Fe$_{0.96}$Al$_{0.04}$)$_2$ as a paradigm for studying a ferromagnetic to antiferromagnetic phase transition, we present interesting thermomagnetic history effects in magnetotransport as well as magnetisation measurements across this phase transition. A comparison is…
Very dilute Fe-Cu systems, model alloys of nuclear reactor pressure vessel (RPV) steels, irradiated by fast neutrons, are studied by positron annihilation experiments and simple calculations. The ultrafine Cu precipitates, which are never formed by thermal aging in the dilute alloys, are observed clearly and are stron…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
In an attempt to obtain wustite ${\mathrm{Fe}}_{1\ensuremath{-}x}\mathrm{O}$ as epitaxial films on MgO(100), ${\mathrm{NO}}_{2}$-assisted molecular-beam epitaxy was applied. At low ${\mathrm{NO}}_{2}$ fluxes, the low-energy electron diffraction and reflection high-energy electron diffraction images indeed indicate the…
Photoexcitation processes of Si(001) are measured by means of two-photon photoemission (2PPE) spectroscopy. The 2PPE spectra obtained at different photon energies exhibit a sharp peak that is enhanced at 3.95 eV photon energy. The peak width is approximately 0.3 eV and the width of the resonance enhancement is less th…
The metathetical reactions of the lithium derivative of the monoanion [((t)BuN)(S)P(mu-N(t)Bu)(2)P(S)(NH(t)Bu)](-) (L) with CuCl/PPh(3), NiCl(2)(PEt(3))(2), PdCl(2)L'(2) (L' = PhCN, PPh(3)), and PtCl(2)(PEt(3))(2) produced the complexes (PPh(3))CuL (5), NiL(2) (6), PdCl(L)(PPh(3)) (7), PdL(2) (8), and Pt(PEt(3))(2)[((…
Electron-spin-resonance (ESR) measurements have been performed on ${\mathrm{FeCr}}_{2}{\mathrm{S}}_{4}$ single crystals in the temperature range 4.2--200 K. On decreasing temperature, the resonance lines strongly shift to low fields for the easy magnetization direction, 〈100〉, and to high fields for the hard direction…
Abstract Linear copolymers that have pendant coumarin‐2 and coumarin‐343 chromophores were prepared as analogues to previously synthesized light‐harvesting dendrimers. The chromophore ratios within these polymers were maintained similar to those of the various generation dendrimers to investigate the effect of polymer…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPolymerization of Alkynes in the Channels of Mesoporous Materials Containing Ni and Zn Cations: Almost Complete Filling of the VoidsDavid J. Cardin, Steven P. Constantine, Andrew Gilbert, Alexander K. Lay, Mercedes Alvaro, Maria S. Galletero, Hermenegildo Garcia, and F…
By means of temperature programmed desorption (TPD), static secondary ion mass spectroscopy (SSIMS), and electron energy loss spectroscopy (EELS), we have investigated further the states of oxygen adsorbed on rutile TiO 2 . Previous work has shown that annealing the (110) surface in a vacuum produces isolated bridging…
Modern electronic devices are increasingly being designed by combining materials with different electronic properties. The conventional semiconductor industry has achieved this by building heterostructures, such as quantum wells and superlattices, from materials with the same crystal structure but different constituen…
Tetraphenylporphinatomanganate(III) tetracyanoethenide, [MnTPP][TCNE], is the prototype of a growing family of linear chain (1-D) coordination polymers that magnetically order as ferrimagnets. [MnTPP][TCNE].xS [S = PhMe (x = 2), 1,2-C(6)H(4)Me(2) (x = 1), 1,2-C(6)H(4)Cl(2) (x = 3), 1,2,4-C(6)H(3)Cl(3) (x = 2), and 1,3…
We synthesized hexagonal ${\mathrm{YMnO}}_{3}$ doped with tetravalent Zr ions and studied the electronic and magnetic properties. Zr substitution creates a mixed ${\mathrm{Mn}}^{3+}\ensuremath{-}{\mathrm{Mn}}^{2+}$ system, instead of the conventional ${\mathrm{Mn}}^{3+}\ensuremath{-}{\mathrm{Mn}}^{4+}$ of colossal mag…