N.L. Edleman、Anchuan Wang、J.A. Belot 等 17 位作者2002-09-10Inorganic Chemistry
A new class of volatile, low-melting, fluorine-free lanthanide metal-organic chemical vapor deposition (MOCVD) precursors has been developed. The neutral, monomeric Ce, Nd, Gd, and Er complexes are coordinatively saturated by a versatile, multidentate ether-functionalized beta-ketoiminato ligand series, the melting po…
Physics of Superconductivity and MagnetismCatalytic Processes in Materials ScienceSemiconductor materials and devices
Keith A. Higginson、Masaru Kuno、John E. Bonevich 等 6 位作者2002-09-10The Journal of Physical Chemistry B
High-quality colloidal mercury sulfide quantum dots (QDs) are synthesized at room temperature using a strategy combining the effects of strongly binding Hg(II) ligands and metal/chalcogen precursor phase separation. This combination prevents both the rapid precipitation of bulk HgS in preparations involving only weak…
Chalcogenide Semiconductor Thin FilmsQuantum Dots Synthesis And PropertiesNanocluster Synthesis and Applications
Francesco Paolo La Mantia、Domenico Curto、Roberto Scaffaro2002-09-10Journal of Applied Polymer Science
Abstract Recycling of polycondensation polymers can give rise to secondary materials with good mechanical properties only if a careful drying is carried out before the melt reprocessing operations. The presence of humidity provokes the hydrolytic chain scission of the macromolecules and the consequent decrease of mole…
biodegradable polymer synthesis and propertiesPolymer Nanocomposites and PropertiesPolymer crystallization and properties
Han Zhang、Jun Magoshi、Mary Ann Becker 等 5 位作者2002-09-10Journal of Applied Polymer Science
Abstract The thermal properties of Bombyx mori silk fibers subjected to heat treatment were examined by thermogravimetry, differential thermal analysis, Fourier transform infrared absorption spectrometry (TG‐DTA‐FTIR) and scanning electron microscopy (SEM). The color, size, and shape of B . mori cocoon shells were obs…
Adhesion, Friction, and Surface InteractionsSilk-based biomaterials and applicationsSilkworms and Sericulture Research
Nam‐Soon Choi、Changhyeon Kim、Kuk Young Cho 等 4 位作者2002-09-10Journal of Applied Polymer Science
Abstract The effect of the compatibilizers, P(LLA‐ co ‐ϵCL) and P(LLA‐ b ‐ϵCL), on the morphology and hydrolysis of the blend of poly(ϵ‐caprolactone) (PCL) and poly( L ‐lactide) (PLLA) was investigated. An addition of P(LLA‐ co ‐ϵCL) or P(LLA‐ b ‐ϵCL) into the blend could enhance the compatibility between the disperse…
Additive Manufacturing and 3D Printing Technologiesbiodegradable polymer synthesis and properties
S. Bid、S.K. Pradhan2002-09-10Journal of Applied Crystallography
The phase transformation kinetics of high-energy ball-milled monoclinic ZrO 2 have been studied in detail by Rietveld powder structure refinement analysis. In the present study, no stabilizing compound was required to obtain the cubic phase. The fine-grain powder was milled in a planetary ball mill for up to several h…
X-ray Diffraction in CrystallographyAdvanced ceramic materials synthesisNuclear materials and radiation effects
J. Hlinka、I. Gregora、J. Pokorny 等 5 位作者2002-09-10arXiv
The paper presents polarized Raman scattering study on a few-micron-size crystallite of LiBC with natural faces. The experiment on as grown sample has revealed a four lattice modes with frequencies at 1276 cm^-1, 830 cm^-1, 546 cm^-1 and 170 cm^-1, respectively. The number of observed Raman lines and their selection r…
SuperconductivityMaterials Science
K. Nakamura、A. J. Freeman2002-09-10arXiv
First principles calculations using the full-potential linearized augmented plane wave (FLAPW) method including intra-atomic noncollinear magnetism have been performed to determine the magnetic structures of RuSr$_{2}$GdCu$_{2}$O$_{8}$. The magnetism clearly arises from the RuO$_{6}$ octahedra where the moments on nei…
Materials ScienceSuperconductivity
W. N. Kang、Eun-Mi Choi、Hyeong-Jin Kim 等 5 位作者2002-09-10arXiv
We report the effect of annealing on the superconductivity of MgB2 thin films as functions of the postannealing temperature in the range from 700 C to 950 C and of the postannealing time in the range from 30 min to 120 min. On annealing at 900 C for 30 min, we obtained the best-quality MgB2 films with a transition tem…
Materials ScienceSuperconductivity
Hidefumi Akiyama、Loren N. Pfeiffer、Masahiro Yoshita 等 5 位作者2002-09-10arXiv
High-quality T-shaped quantum wires are fabricated by cleaved-edge overgrowth with the molecular beam epitaxy on the interface improved by a growth-interrupt high-temperature anneal. Characterization by micro-photoluminescence (PL) and PL excitation (PLE) spectroscopy at 5 K reveals high uniformity, a sharp spectral w…
Materials ScienceMesoscale and Nanoscale Physics
M. S. Sercheli、C. Rettori、A. R. Zanatta2002-09-10arXiv
Amorphous silicon films doped with Y, La, Gd, Er, and Lu rare-earth elements (a-Si:RE) have been prepared by co-sputtering and studied by means of electron spin resonance (ESR), dc-magnetization, ion beam analysis, optical transmission, and Raman spectroscopy. For comparison the magnetic properties of laser-crystalliz…
Materials Sciencecond-mat.dis-nn
M. S. Sercheli、C. Rettori、A. R. Zanatta2002-09-10arXiv
Amorphous silicon-nitrogen thin films doped with rare-earth elements (a-SiN:RE; RE = Y, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Yb, and Lu) have been prepared by co-sputtering and studied by means of electron spin resonance (ESR). It was found that the neutral dangling-bond density [D0] of a-SiN films decreases with the p…
Materials Sciencecond-mat.dis-nn
О. А. Тихомиров、Hua Jiang、Jeremy Levy2002-09-10Physical Review Letters
The temperature-dependent polarization of SrTiO3 thin films is investigated using confocal scanning optical microscopy. A homogeneous out-of-plane and an inhomogeneous in-plane ferroelectric phase are identified from images of the linear electro-optic response. Both hysteretic and nonhysteretic behavior are observed u…
Acoustic Wave Resonator TechnologiesFerroelectric and Piezoelectric MaterialsElectronic and Structural Properties of Oxides
J. M. An、S. Y. Savrasov、H. Rosner 等 4 位作者2002-09-10arXiv
The phonon-mode decomposition of the electron-phonon coupling in the MgB2-like system Li_{1-x}BC is explored using first principles calculations. It is found that the high temperature superconductivity of such systems results from extremely strong coupling to only ~2% of the phonon modes. Novel characteristics of E_2g…
SuperconductivityMaterials Science
A. Jura、G. Kontrym-Sznajd、M. Samsel-Czekala2002-09-10arXiv
We present three-dimensional (3D) electron-positron momentum densities in Mg and Cd, reconstructed from 2D angular correlation of annihilation radiation data. By folding densities from the extended momentum space into the first Brillouin zone, we separated Fermi surfaces in various bands. Our results are in good agree…
Materials Science
Munehisa Yasuniwa、Tadaaki Satou2002-09-10Journal of Polymer Science Part B Polymer Physics
Abstract The multiple melting behavior of poly(butylene succinate) (PBSu) was studied with differential scanning calorimetry (DSC). Three different PBSu resins, with molecular weights of 1.1 × 10 5 , 1.8 × 10 5 , and 2.5 × 10 5 , were cooled from the melt (150 °C) at various cooling rates (CRs) ranging from 0.2 to 50…
biodegradable polymer synthesis and propertiesNatural Fiber Reinforced CompositesPolymer crystallization and properties
L. Ehm、K. Knorr、W. Depmeier2002-09-10arXiv
The high pressure behaviour of 3R-NbS2 has been investigated by angle-dispersive X-ray powder diffraction using diamond anvil cells up to 14 GPa. The compression behaviour of the structure is highly anisotropic. The compressibility perpendicular to the layers is 2.5 times higher than within the layers. A fit of a 3rd-…
Materials Science
K. Capelle、N. A. Lima、M. F. Silva 等 4 位作者2002-09-10arXiv
We construct and apply an exchange-correlation functional for the one-dimensional Hubbard model. This functional has built into it the Luttinger-liquid and Mott-insulator correlations, present in the Hubbard model, in the same way in which the usual {\it ab initio} local-density approximation (LDA) has built into it t…
Strongly Correlated ElectronsMaterials Science
H. Sormann、G. Kontrym-Sznajd、R. N. West2002-09-10arXiv
Four theoretical approaches to calculate momentum densities of electron-positron annihilation pairs (MDAP) in crystalline solids are confronted with 3D densities reconstructed from two-dimensional angular correlation (2D-ACAR) data for copper, chromium, and yttrium. It is shown that the Bloch-modified ladder theory, i…
Materials Science
I. C. Dragomir、T. Ungár2002-09-10Journal of Applied Crystallography
Strain anisotropy can be well accounted for by the dislocation model of lattice distortion. In a texture-free powder or polycrystal, or if all possible Burgers vectors are equally populated, the dislocation contrast factors are a linear function of the fourth-order invariants of the hkl indices. Using this relation th…
Microstructure and mechanical propertiesX-ray Diffraction in CrystallographyTitanium Alloys Microstructure and Properties