Larissa Zherlitsyna、Norbert Auner、Michael Bolte2006-04-13Acta Crystallographica Section C Crystal Structure Communications
The title compound, [Cu8(C8H24O2Si)2(C3H7NO)8].C4H4N2.C3H7NO, features a sandwich-like cage enclosing a pyrazine molecule, both situated on a centre of inversion. In addition, the crystal structure contains one dimethylformamide molecule which is disordered over a centre of inversion. The copper layer, containing eigh…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesPolyoxometalates: Synthesis and Applications
R. Chitra、Vijay Thiruvenkatam、Rajul Ranjan Choudhury 等 5 位作者2006-04-13Acta Crystallographica Section C Crystal Structure Communications
In the title 2:1 salt, 2C2H6NO2+.C2O4(2-), the glycine molecule is in the cationic form with a positively charged amino group and an uncharged carboxylic acid group. The doubly charged oxalate anion lies across a crystallographic inversion centre. One of the reasons why the 1:1 glycinium oxalate salt has a higher melt…
Lanthanide and Transition Metal ComplexesPorphyrin Metabolism and DisordersMethemoglobinemia and Tumor Lysis Syndrome
A. Maignan、B. Raveau、S. Hébert 等 6 位作者2006-04-13Journal of Physics Condensed Matter
Cerium for strontium substitution allows an oxygen deficient perovskite Sr(1-x)Ce(x)CoO(3-δ) to be stabilized with a cerium solubility limited to x≤0.15 (Trofimenko et al 1997 Solid State Ion. 100 183). For these samples, the magnetic properties depend clearly upon the oxygen content: Sr(0.9)Ce(0.1)CoO(2.74) and Sr(0.…
Magnetic and transport properties of perovskites and related materialsRare-earth and actinide compoundsAdvanced Condensed Matter Physics
L. Marušić、Vito Despoja、M. Šunjić2006-04-13Journal of Physics Condensed Matter
Surface excitation spectra are calculated, including both collective and single-particle modes, and examined in detail. This is achieved by calculating the non-local dielectric function ε(p)(Q,z,z('),ω) of the thin jellium film within the random phase approximation (RPA) (using local density approximation wavefunction…
Gold and Silver Nanoparticles Synthesis and ApplicationsOptical Coatings and GratingsSurface and Thin Film Phenomena
M. Malki、M. Micoulaut、F. Chaimbault 等 4 位作者2006-04-13Physical Review Letters
Non-Arrhenius behavior is observed for a number of virgin potassium silicate glasses (1-x)SiO2-xK2O with a potassium oxide concentration larger than a certain value x = x(c). Recovering of Arrhenius behavior is provided by the annealing that enhances densification. These various results are the manifestation of the fl…
Glass properties and applicationsTransition Metal Oxide NanomaterialsPhase-change materials and chalcogenides
Jorge Íñiguez、L. Bellaïche2006-04-13Physical Review B
We use a first-principles-based approach on periodic nanometric supercells to compare the properties of $\mathrm{Pb}({\mathrm{Sc}}_{1∕2}{\mathrm{Nb}}_{1∕2}){\mathrm{O}}_{3}$ (PSN), a ferroelectric with relaxor-like characteristics, and $\mathrm{Pb}({\mathrm{Zr}}_{0.6}{\mathrm{Ti}}_{0.4}){\mathrm{O}}_{3}$ (PZT), a norm…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsDielectric materials and actuators
Gap Soo Chang、E.Z. Kurmaev、D W Boukhvalov 等 8 位作者2006-04-13Journal of Physics Condensed Matter
The electronic structure of Co-doped anatase TiO(2) epitaxial thin films grown at different partial oxygen pressures is investigated using soft x-ray emission spectroscopy. The resonantly excited Co L(2,3) x-ray emission spectra of ferromagnetic Ti(0.96)Co(0.04)O(2) samples for the oxygen-deficient regime show that th…
ZnO doping and propertiesMagnetic and transport properties of perovskites and related materialsElectronic and Structural Properties of Oxides
Alejandro B. Rodríguez‐Navarro、Pedro Álvarez‐Lloret、M. Ortega‐Huertas 等 4 位作者2006-04-13Journal of the American Ceramic Society
Crystal sizes can be calculated from peak intensities of spotty diffraction rings produced by a polycrystalline sample. Such patterns are collected using a small X‐ray beam and an area detector. Peak intensities can be automatically measured using specially designed software. Crystal sizes can be determined from peak…
Metallic Glasses and Amorphous AlloysX-ray Diffraction in CrystallographyPowder Metallurgy Techniques and Materials
S. Manivannan、S. Dhanuskodi、Kristin Kirschbaum 等 4 位作者2006-04-13Crystal Growth & Design
A novel organic nonlinear optical material 4-dimethylaminopyridinium l -tartrate dihydrate (DMAPT·2H 2 O) (C 11 H 16 N 2 O 6 ·2H 2 O) was synthesized and characterized by CHN elemental analysis, FT-NMR, FT-IR, and FT-Raman spectral studies. Single crystals of average dimensions 15 × 2 × 2 mm 3 were grown by the solven…
Crystal structures of chemical compoundsCrystal Structures and PropertiesNonlinear Optical Materials Research
Chang Lü、Xiaofeng Yu、Shaoyun Guo2006-04-13Journal of Polymer Science Part B Polymer Physics
Abstract The effect of ultrasonic oscillations and ultrasonic oscillation‐induced modes on weld line strength of polystyrene(PS) and polystyrene/polyethylene(PS/HDPE) blend was investigated. And the mechanism of ultrasonic improvement of weld line strength of PS and PS/HDPE blend was also studied. The presence of ultr…
Polymer crystallization and propertiesEpoxy Resin Curing ProcessesInjection Molding Process and Properties
Gun‐Tae Park、Chee‐Sung Park、Jong‐Jin Choi 等 5 位作者2006-04-13Journal of the American Ceramic Society
Lead zirconate titanate (PZT) films were deposited on platinized silicon substrates by spin coating using PZT sols containing polyvinylpyrrolidone (PVP) as an additive. PZT films with a 60/40 composition and a thickness of up to 8 μm were fabricated by repeating the deposition process 15 times on highly oriented (100)…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesMicrowave Dielectric Ceramics Synthesis
Marina Potapova2006-04-13Nova Hedwigia
Achnanthidium zhakovschikovii is described as a new epiphytic species from spring-fed rivers near St. Petersburg, Russia. This species belongs to the group of Achnanthidium taxa with terminal raphe fissures curved to one side of the valve. The new species differs from other taxa in this group by the broadly linear to…
Diatoms and Algae Research
Emmanuel Angot、Rozenn Le Parc、Claire Levelut 等 7 位作者2006-04-13Journal of Physics Condensed Matter
Al(1-x)Ga(x)PO(4) solid solutions (x = 0.2, 0.3, 0.38, 0.7) and the pure AlPO(4) (x = 0) and GaPO(4) (x = 1) end members with the α-quartz-type structure were studied by Raman scattering. An investigation as a function of composition enabled the various modes to be assigned, in particular coupled and decoupled vibrati…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsSolid-state spectroscopy and crystallography
John C. Mauro、Arun K. Varshneya2006-04-13Journal of the American Ceramic Society
We present a multiscale model of GeSe 2 glass structure, where interatomic potentials are calculated using Møller–Plesset perturbation theory and a cluster expansion approach. The ab initio calculations are fit to continuous functions and used in a classical Monte Carlo simulation of 1200 atoms. The resulting GeSe 2 g…
Glass properties and applicationsCrystal Structures and PropertiesPhase-change materials and chalcogenides
Sanjay Mathur、Hao Shen、Michael Veith 等 5 位作者2006-04-13Journal of the American Ceramic Society
Yttrium aluminum garnet (YAG) nanopowders doped with high neodymium (Nd) content (3 at.%) were synthesized by the sol–gel processing of (i) alkoxide precursors and (ii) metal chelates formed by complexing the cations with polyethylene glycol. A stoichiometric YAG composition was obtained following both procedures; how…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsSolid State Laser Technologies
Takeshi Sakamoto、Makoto Wakeshima、Yukio Hinatsu2006-04-13Journal of Physics Condensed Matter
The physical properties of parkerite and its related compound, Bi(2)Ni(3)X(2) (X = S, Se), were studied. The electrical resistivity of both compounds shows typical metallic behaviour up to 400 K. The resistivity and specific heat measurements at low temperatures reveal that these compounds are superconducting with a t…
Physics of Superconductivity and MagnetismRare-earth and actinide compoundsIron-based superconductors research
Ying Yang、Alicia J. El Haj2006-04-13Expert Opinion on Biological Therapy
The use of cells as therapies for disease, repair and regeneration of tissues is one of the new challenges in modern therapeutics. To facilitate the ability to localise, condition and protect cells, biodegradable scaffolds are being developed that will improve the efficiency of these treatments. Thus, cell delivery sy…
Bone Tissue Engineering MaterialsElectrospun Nanofibers in Biomedical Applications3D Printing in Biomedical Research
Sergey V. Krivovichev、Oleg I. Siidra、Еvgeny V. Nazarchuk 等 5 位作者2006-04-13Inorganic Chemistry
Dark-green platy crystals of the new compound Pb31O22Br10Cl8 (1) have been obtained by rapid quenching of a lead oxide halide melt. The structure of 1 (triclinic, P1, a = 12.1192(7) angstroms, b = 16.2489(10) angstroms, c = 18.3007(11) angstroms, alpha = 93.104(2) degrees, beta = 95.809(2) degrees, gamma = 111.252(1)…
Crystal Structures and PropertiesPolyoxometalates: Synthesis and ApplicationsSolid-state spectroscopy and crystallography
C.R.H. Bahl、Mikkel Fougt Hansen、Thomas Pedersen 等 7 位作者2006-04-13Journal of Physics Condensed Matter
We have studied the magnetic properties of (57)Fe-doped NiO nanoparticles using Mössbauer spectroscopy and magnetization measurements. Two samples with different degrees of interparticle interaction were studied. In both samples the particles were characterized by high-resolution transmission electron microscopy and x…
Multiferroics and related materialsMagnetic Properties and Synthesis of FerritesIron oxide chemistry and applications
Chaoyang Wei、Shijie Liu、Degang Deng 等 6 位作者2006-04-13Optics Letters
Electric fields inside guided-mode resonance filters (GMRFs) may be intensified by resonance effects. The electric field enhancement is investigated in two GMRFs: one is resonant at normal incidence, the other at oblique incidence. It is shown that the two GMRFs exhibit different behaviors in their electric enhancemen…
Photonic Crystals and ApplicationsOptical Coatings and GratingsNear-Field Optical Microscopy