Materials Literature
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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…
The energies of trivalent rare-earth ions relative to the host valence band were measured for a series of rare-earth-doped yttrium aluminum garnets ${R}_{x}{\mathrm{Y}}_{3\ensuremath{-}x}{\mathrm{Al}}_{5}{\mathrm{O}}_{12} (R=\mathrm{Gd},$ Tb, Dy, Ho, Er, Tm, Yb, and Lu and $0<~x<~3),$ using ultraviolet photoemis…
The influence of the corona-charging process on the piezoelectric transducer coefficient d 33 of a cellular electret film has been investigated. An increased corona voltage can be considered as a way to enhance the charge density and thus also the resulting piezoelectric effect. Higher corona-charging voltages are pos…
For a long time, it has been known that the power spectrum of Barkhausen noise had a power-law decay at high frequencies. Up to now, the theoretical predictions for this decay have been incorrect, or have only applied to a small set of models. In this paper, we describe a careful derivation of the power spectrum expon…
We have investigated the modification of the three-phonon Umklapp process in a quantum wire caused by the effect of phonon confinement. Our formalism rigorously takes into account variations in phonon group velocity as well as the presence of an energy gap between the phonon modes due to the quantization of the radial…
The dielectric and conduction behavior of SrTiO3 thin films deposited on a SrTiO3 single-crystal substrate is studied. Without dc bias, an obvious dielectric “defect mode” in the dielectric loss is observed in the temperature range of ∼100–200 K; however, no noticeable corresponding dielectric constant peak is observe…
In this letter, by use of the first-principles calculations, field emission properties of the body are investigated for a series of dimension-variational single-walled carbon nanotubes (SWNTs). We find that in the course of increasing tube diameter, at low emission currents, field emission properties worsen, chemical…
Lanthanum aluminate (LaAlO3) films were deposited on Si(100) substrates by evaporating single-crystal pellets in vacuum using an electron-beam gun. Then, they were annealed in N2 ambience at 700 °C for 10 min using an electric furnace. X-ray diffraction analysis showed that the LaAlO3 films were amorphous even after t…
Thin film capacitor structures in which the dielectric is composed of superlattices of the relaxors [0.2Pb(Zn1/3Nb2/3)O3–0.8BaTiO3] and Pb(Mg1/3Nb2/3)O3 have been fabricated by pulsed laser deposition. Superlattice wavelength (Λ) was varied between ∼3 and ∼600 nm, and dielectric properties were investigated as a funct…