Materials Literature
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The presence of space charge in the polymeric insulation of high-voltage cables is thought to be correlated with electric breakdown. However, a direct link between molecular properties, space charge formation and eventual breakdown has still to be established. It is clear that both physical (e.g., conformational disor…
The structural properties, the static and relaxation dielectric coefficients $[{\ensuremath{\epsilon}}_{j}$ and ${\ensuremath{\epsilon}}_{j}(\ensuremath{\omega})$ $(j=\ensuremath{\Vert},\ensuremath{\perp})],$ the rotational diffusion constants ${D}_{\ensuremath{\perp}}$ and ${D}_{\ensuremath{\Vert}},$ the orientationa…
Electric-field-induced structural transition of a single crystal $\mathrm{Pb}({\mathrm{Zn}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}\ensuremath{-}8%{\mathrm{PbTiO}}_{3}$ grown in the (001) direction was studied by use of Raman scattering spectroscopy. By comparing the changes in Raman spectra induced by the electric…
We demonstrate that elastic properties of cluster-assembled carbon films can be measured by surface Brillouin scattering. We have studied films with different nano- and mesostructures produced with different precursor cluster mass distributions. In particular, films showing very high and low surface roughness have bee…
The salts [18-crown-6-K](4)[Sn(4)Se(10)].5en and [18-crown-6-K](4)[Sn(4)Te(10)].3en.2THF were isolated upon addition of THF to the ethylenediamine (en) extracts of the alloys KSn(0.90)Se(1.93) and K(4)Sn(4)Te(10) that had been extracted in the presence of 18-crown-6 (1,4,7,10,13,16-hexaoxacyclooctadecane). The Sn(4)Te…
Dynamics of the spin system has been investigated in a ferromagnetic ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ film by means of a time-resolved pump-probe method. In a weak excitation condition, the relaxation time $\ensuremath{\tau}$ increases critically on approaching the critical temperature ${T}_{…
Positive magnetoresistance (MR) in ${\mathrm{La}}_{0.7}{\mathrm{Pb}}_{0.3}{\mathrm{MnO}}_{3}$ single crystals was observed between temperatures 4.2 and 50 K, in addition to the negative colossal magnetoresistance (CMR) at higher temperatures. The positive MR increases with temperature lowered and reaches $20%$ at $T=4…
Thickness inhomogeneities in thin films have a large influence on their optical transmission and reflection spectra. If not taken into account, this may lead to rather large calculated values for the absorption coefficient or the erroneous presence of an absorption-band tail, as well as to significant errors in the ca…
Incorporation and lattice migration of cesium in three apatites fluorapatite ${\mathrm{Ca}}_{10}({\mathrm{PO}}_{4}{)}_{6}{\mathrm{F}}_{2},$ lanthanum-fluorobritholite ${\mathrm{Ca}}_{4}{\mathrm{La}}_{6}({\mathrm{SiO}}_{4}{)}_{6}{\mathrm{F}}_{2}$ and lanthanum-oxyapatite ${\mathrm{Ca}}_{2}{\mathrm{La}}_{8}({\mathrm{SiO…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhosphorous Acid and Arsenious Acid as LigandsMaxim N. Sokolov, Alexander V. Virovets, Danil N. Dybtsev, Elena V. Chubarova, Vladimir P. Fedin, and Dieter FenskeView Author Information Institute of Inorganic Chemistry of the Russian Academy of Sciences, pr. Lavrentjeva…
We consider the electronic properties of layered molecular crystals of the type $\ensuremath{\theta}\ensuremath{-}{D}_{2}A$ where A is an anion and D is a donor molecule such as bis-(ethylenedithia-tetrathiafulvalene) (BEDT-TTF), which is arranged in the $\ensuremath{\theta}$-type pattern within the layers. We argue t…
The efficient reversible functionalization of the periphery of urea adamantyl poly(propylene imine) dendrimers with catalytic sites using noncovalent interactions is described. Phosphine ligands equipped with urea acetic groups, a binding motive complementary to that of the dendrimer host, have been prepared and assem…
The geometry of the multiple diffraction of a (001) silicon wafer in an x-ray powder diffractometer is elucidated. In particular, multiple diffraction occurs only when the sample is rotated (along the sample normal) to one of the specific azimuthal angles. A derivation based on analytical geometry is performed to obta…
The prospects of two classes of diamond devices are reviewed, namely electronic devices on single-crystal substrates and microsystems devices on Si substrate. The transistor structures on single-crystal diamond represent still proof-of-concept experiments; however, they already allow us to extract their potential. The…
A dramatic enhancement in fluorescence intensity from 1,1'-bi-2-naphthol (BINOL) to dendritic phenyleneethynylenes containing the BINOL core was observed. The strong fluorescence of the dendrimers allows a very small amount of the chiral materials to be used for sensing. The light harvesting antennas of the dendrimer…
Free charge carriers in mesoporous Si (meso-PS) consisting of Si nanocrystals of small dimensions of about 6--10 nm are investigated by the infrared-absorption technique. Adsorption of acceptor molecules or filling the pores with dielectric liquids are found to increase the concentration of free holes (p) in meso-PS u…
We analyze broadband ac conductivity spectra of various ion conducting glasses with regard to the composition dependence of the "Jonscher behavior" and of the "nearly constant-loss behavior." In the temperature range of our experiments (173 K< or =T< or =573 K), both types of behavior are closely related, indicating t…
Predictions of the electronic and structural properties of silicon substitutional doping in carbon nanotubes are presented using first-principles calculations based on the density-functional theory. A large outward displacement of the Si atom and its nearest-neighbor carbon atoms is observed. For the two tubes studied…
Plasticized whey-protein and whey-protein emulsion films were produced using sorbitol and glycerol as plasticizers and butterfat and candelilla wax as lipids. Protein, plasticizer, and lipid ratios were optimized to obtain acceptable free-standing flexible films. Water solubility (20 degrees C, 24 h) and moisture sorp…
The chirality-dependent G-band Raman intensity of single wall carbon nanotubes is calculated using a nonresonant theory for the Raman tensor. We obtain six or three intense Raman modes, respectively, for chiral or achiral nanotubes, whose relative intensities depend on the chiral angle of the nanotube. The longitudina…