Materials Literature
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Fullerenes and nanotubes are promising candidates in the development of nanodevices. Recently, a form of carbon nanotube torus structures has been observed. In this regard, we have investigated the geometries, electronic structures, and energetics of small carbon nanotube tori, using both the tight-binding and semiemp…
We present depolarized light scattering data of the glass former toluene as obtained from tandem Fabry–Perot interferometry and Raman scattering covering a frequency range 0.5 GHz<v<5000 GHz. A large temperature interval of the (supercooled) liquid (Tg=117 K<T<295 K) as well as of the glass…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.Porous Crystal Formation from Polyoxometalate Building Blocks: Single-Crystal Structure of [AlO4Al12(OH)12(H2O)24][Al(OH)6Mo6O18]2((OH)· 29.5H2OJung-Ho Son, Hyuk Choi, and Young-Uk KwonView Author In…
A cyclic version of the Entner-Doudoroff pathway is used by Pseudomonas aeruginosa to metabolize carbohydrates. Genes encoding the enzymes that catabolize intracellular glucose to pyruvate and glyceraldehyde 3-phosphate are coordinately regulated, clustered at 39 min on the chromosome, and collectively form the hex re…
The structural organization of nitridic ceramics in the system Si/B/N/C on an intermediate length scale is studied using 29 Si{ 11 B} rotational echo adiabatic passage double resonance (REAPDOR) and 11 B{ 29 Si} rotational echo double resonance (REDOR) NMR spectroscopy. The experiments are performed on a 100% 29 Si en…
X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure (XANES) spectroscopy were used to characterize the oxygen species in perovskite-type La 1 - x Sr x CoO 3 - δ with x = 0 and 0.2. The XPS method used synchrotron radiation with variable excitation energies. XPS showed two kinds of oxygen sp…
Low-temperature resistivity of half-metals is investigated. To date it has been discussed that the one-magnon scattering process in half-metals is irrelevant for low-temperature resistivity, due to the fully spin-polarized electronic structure at the ground state. If one takes into account the non-rigid-band behavior…
The minimum time t required to form an amorphous spot in a crystalline film of Ge2Sb2Te5 with NaCl structure was investigated for various applied laser powers P. An elementary power law of the form P∝t−0.5 is observed for pulse lengths larger than 10 ns which shows that amorphization occurs as soon as the melting temp…
In the past it has been claimed that lamellar molybdenum disulfide ${\mathrm{MoS}}_{2}$ undergoes a deep structural transformation upon lithium intercalation. In the absence of accurate x-ray diffraction data, the structure of ${\mathrm{LiMoS}}_{2}$ is not clearly known, even if recent x-ray absorption spectroscopy re…
We report the synthesis and luminescence decay kinetics of 1.2-nm ${\mathrm{Mn}}^{2+}$-doped ZnS nanoclusters grown in reverse micelles. The preparation method produces small particles with narrow-size distribution and fluorescence bands near 400--450 nm and 585 nm. Time-dependent fluorescence decay measurements using…
Barium titanate $({\mathrm{BaTiO}}_{3})$ ultrafine powders have been prepared from a monomeric metallo-organic precursor through combined solid-state polymerization and pyrolysis. This particular preparation route enables an adjustment of the mean particle size in a wide range from a few nanometers up to micrometer si…
Conductivity and permittivity of the quasi-one-dimensionsional organic transfer salt $(\mathrm{TMTTF}{)}_{2}{\mathrm{PF}}_{6}$ have been measured at low frequencies ${(10}^{3}--{10}^{7}\mathrm{Hz})$ between room temperature down to below the temperature of transition into the spin-Peierls state. We interpret the huge…
Electronic structure calculations of ${\mathrm{LiB}}_{3}{\mathrm{O}}_{5},$ ${\mathrm{CsB}}_{3}{\mathrm{O}}_{5},$ and ${\mathrm{CsLiB}}_{6}{\mathrm{O}}_{10}$ crystals from first principles are performed based on a plane-wave pseudopotential method. The static second-harmonic generation (SHG) coefficients are calculated…
The effect of nitrogen addition on the properties of tetrahedral amorphous carbon (ta-C) has been studied. The ta-C is deposited by a filtered cathodic vacuum arc. The effect of introducing nitrogen on its plasma was measured by a retarding field analyzer and optical emission spectroscopy. The ta-C:N films were studie…
The symmetries of spontaneous lattice distortions in carbon nanotubes are investigated. When the degeneracy of the ground states remains discrete, there are solitons or domain walls connecting the different symmetry-broken vaccua. These solitons, similarly to the case of polyacetelene, are fractionally charged states.…
Molecular-dynamics calculations were performed to simulate ion beam deposition of diamond-like carbon films. Using the computationally efficient analytical potentials of Tersoff and Brenner we are able to simulate more than 103 carbon atom impacts on {111} diamond, so that steady-state film properties can be computed…
The electron and hole addition energies, the quasiparticle gap, and the optical gap of InAs, InP, and Si quantum dots are calculated using microscopic pseudopotential wave functions. The effects of the dielectric mismatch between the quantum dot and the surrounding material are included using a realistic profile for t…
In previous work, we studied the electronic structure of several molybdate and tungstate crystals having the scheelite structure. The wolframite structure is another common form for molybdate and tungstate materials. In this paper, we compare two chemically similar materials that naturally form in the scheelite and wo…
Model calculations are presented that predict whether or not an arbitrary gas experiences significant absorption within carbon nanotubes and/or bundles of nanotubes. The potentials used in these calculations assume a conventional form, based on a sum of two-body interactions with individual carbon atoms; the latter em…
The self-interstitial in diamond produces optical absorption in two narrow lines at 1684.6 and 1859.4 meV. In ${}^{13}\mathrm{C}$ diamond the 1685 meV line shifts by $1.7\ifmmode\pm\else\textpm\fi{}0.2\mathrm{meV}$ to higher energy compared to natural diamond, while the 1859 meV line shifts by $5.35\ifmmode\pm\else\te…