Lei Zhu、Ping Huang、William Y. Chen 等 14 位作者2003-04-03Macromolecules
The hexagonally perforated layer (HPL) phase in a polystyrene- b -poly(ethylene oxide) (PS- b -PEO) diblock copolymer was systematically studied by small-angle X-ray scattering (SAXS) in reciprocal space and transmission electron microscopy (TEM) in real space. Detailed crystallographic analyses revealed that the shea…
Advanced Polymer Synthesis and CharacterizationRheology and Fluid Dynamics StudiesBlock Copolymer Self-Assembly
R.B. Greegor、Claudio G. Parazzoli、K. Li 等 4 位作者2003-04-03Applied Physics Letters
Negative index of refraction materials have been postulated for many years but have only recently been realized in practice. In the microwave region these materials are constructed of rings and wires deposited on a dielectric substrate to form a unit cell. We have constructed, experimentally characterized, and simulat…
Metamaterials and Metasurfaces ApplicationsMicrowave Engineering and WaveguidesAdvanced Antenna and Metasurface Technologies
Marcin Zając、J. Gosk、Ewa Grzanka 等 8 位作者2003-04-03Journal of Applied Physics
Ferromagnetic behavior of GaN doped with Mn (Ga1−zMnzN) grown by the ammonothermal and chemical transport methods is discussed in terms of a second phase (ferromagnetic one) produced during the growth process. The reference manganese nitride samples grown by the same method as (Ga,Mn)N reveal room-temperature ferromag…
ZnO doping and propertiesGaN-based semiconductor devices and materialsGa2O3 and related materials
Ponniah Vajeeston、P. Ravindran、R. Vidya 等 5 位作者2003-04-03Applied Physics Letters
The electronic structure and structural stability of the technologically interesting material NaAlH4 are studied using an ab initio projected augmented plane-wave method for different possible structure modifications. We predict that α-NaAlH4 converts to β-NaAlH4 at 6.43 GPa with a 4 % volume contraction. Both modific…
Hydrogen Storage and MaterialsNuclear Materials and PropertiesSuperconductivity in MgB2 and Alloys
Dane Morgan、Billie Wang、Gerbrand Ceder 等 4 位作者2003-04-03Physical review. B, Condensed matter
First-principles electronic structure methods have been used to calculate the ground state, transition temperature, and thermodynamic properties of magnetic excitations in spinel ${\mathrm{MnO}}_{2}.$ The magnetic interactions are mapped onto a Heisenberg model whose exchange interactions are fitted to results of firs…
Magnetic and transport properties of perovskites and related materialsMultiferroics and related materialsAdvanced Condensed Matter Physics
Jessica M. Chow、Angela M. Miller、Matthew J. Elrod2003-04-03The Journal of Physical Chemistry A
The temperature dependence of the overall rate constant for the C 3 H 7 O 2 + NO reaction and the rate constant for the minor branching channel resulting in the production of i -C 3 H 7 ONO 2 have been measured using the turbulent flow technique with high-pressure chemical ionization mass spectrometry for the detectio…
Atmospheric chemistry and aerosolsCatalytic Processes in Materials ScienceCarbon Dioxide Capture Technologies
S. Azevedo、Mário S. C. Mazzoni、Hélio Chacham 等 4 位作者2003-04-03Applied Physics Letters
We apply first-principles calculations to study the electronic structure of boron nitride nanocones with disclinations of different angles θ=nπ/3. Nanocones with odd values of n present antiphase boundaries that cause a reduction of the work function of the nanocones, relative to the bulk BN value, by as much as 2 eV.…
Graphene research and applicationsDiamond and Carbon-based Materials ResearchBoron and Carbon Nanomaterials Research
C. G. M. Hermse、F. Fréchard、Alexander P. van Bavel 等 7 位作者2003-04-03The Journal of Chemical Physics
We present a dynamic Monte-Carlo model involving lateral interactions and different adsorption sites (top, fcc and hcp). Using this model in combination with kinetic parameters from UHV experiments and lateral interactions derived from DFT calculations we have reproduced the ordering behavior of NO on Rh(111) during a…
Advanced Chemical Physics StudiesCatalytic Processes in Materials ScienceAmmonia Synthesis and Nitrogen Reduction
Zhicheng Xu2003-04-03Journal of Applied Physics
Single crystals of Zn doped lithium ferrite have been obtained by an improved flux method. The magnetic anisotropy and Mössbauer spectra of the system (Fe1−x3+Znx2+)[Fe(3+x)/23+Li(1−x)/2+]O4 with 0⩽x⩽0.5 have been investigated. According to the single-ion model, the magnetic anisotropy constant K1 depends mainly on th…
Multiferroics and related materialsMagnetic Properties and Synthesis of FerritesIron oxide chemistry and applications
Jianhua Hao、Jianfeng Gao、Michael Cocivera2003-04-03Applied Physics Letters
Green, blue, and yellow cathodoluminescence (CL) have been obtained for thin-films of Ba2B5O9Cl doped with Tb3+, Tm3+, and Mn2+, respectively. These phosphor films were deposited by spray pyrolysis, and then activated in air at temperatures suitable for use on glass substrates. The CL characteristic peaks of the films…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsLuminescence and Fluorescent Materials
Marcos A.L. Nobre、Silvania Lanfredi2003-04-03Applied Physics Letters
Bi 1.5 ZnSb 1.5 O 7 dielectric ceramic with pyrochlore structure was investigated by impedance spectroscopy from 400 to 750 °C. Pyrochlore was synthesized by the polymeric precursor method, a chemical synthesis route derived from Pechini’s method. The grain or bulk resistance exhibits a sensor temperature characterist…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesElectrical and Thermal Properties of Materials
Tetsuji Saito2003-04-03Applied Physics Letters
Co–Zr–B alloys have been produced by melt-spinning followed by heat treatments. The magnetic properties of the Co–Zr–B melt-spun ribbons depend on the annealing temperature. The maximum energy product of the optimally annealed Co–Zr–B melt-spun ribbons (BH)max=4.74 MGOe, is comparable to those of the hard ferrites. Th…
Magnetic properties of thin filmsMetallic Glasses and Amorphous AlloysMagnetic Properties of Alloys
L. Chen、C. L. Chen、Y. Lin 等 8 位作者2003-04-03Applied Physics Letters
The high temperature electrical behavior of highly epitaxial CaCu3Ti4O12 thin films on (001) LaAlO3 have been systematically investigated with traditional four-probe dc and ac resistance measurement techniques and two-probe ac impedance spectroscopy. Both ac and dc resistance measurements reveal that the Arrhenius plo…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsDielectric properties of ceramics
Haralampos Zois、L. Apekis、Yevgen Mamunya2003-04-03Journal of Applied Polymer Science
Abstract The dielectric properties and the structure of various metal–polymer composites, based on a polymer matrix of polyamide (PA), polyethylene (PE), polyoxymethylene (POM), or blend PE/POM filled with dispersed iron (Fe) particles, have been investigated in this work. In PE–Fe, PA–Fe, and POM–Fe composites the fi…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesDielectric materials and actuators
Håkan W. Hugosson、Hans Högberg、M. Algren 等 5 位作者2003-04-03Journal of Applied Physics
We have performed ab initio studies of the effect of substitutions on the phase stabilities of Ti1−xAlxN, x=0−1. The nonmetal substitutions studied include B, C, O, and Si. Metal substitutions studied include Sc, Zr, V, Cr, and Mn. The main objective has been to suggest substitutions that increase the thermal stabilit…
Advanced ceramic materials synthesisMetal and Thin Film MechanicsMXene and MAX Phase Materials
Tianyi Ke、Xiuzhi Susan Sun2003-04-03Journal of Applied Polymer Science
Abstract Triethyl citrate (TC) was added as a plasticizer to a blend of poly(lactic acid) (PLA) and starch in the presence of methylenediphenyl diisocyanate (MDI). As expected, TC improved the elongation at break and toughness and, at the same time, decreased the tensile strength and modulus. However, TC did not signi…
biodegradable polymer synthesis and propertiesMicroplastics and Plastic PollutionCarbon dioxide utilization in catalysis
Xinming Wan、Haiqing Xu、Tianhou He 等 5 位作者2003-04-03Journal of Applied Physics
A systematic study of the optical properties of tetragonal Pb(Mg1/3Nb2/3)0.62Ti0.38O3 single crystals was calculated out at room temperature. It was found that the crystal is transparent in the visible region and rolls off in near 450 nm. The optical absorption edge is around 400 nm under both unpoled and poled condit…
Ferroelectric and Piezoelectric MaterialsPhotorefractive and Nonlinear OpticsMicrowave Dielectric Ceramics Synthesis
I. Boerasu、L. Pintilie、M. Pereira 等 5 位作者2003-04-03Journal of Applied Physics
Asymmetric metal–ferroelectric–metal (MFM) structures were manufactured by sol–gel deposition of a lead zirconate-titanate (PZT with Zr/Ti ratio 65/35) film on Pt-coated Si, with a Au top electrode. The average remnant polarization of 9 μC/cm2 and the coercive field of 39 kV/cm were obtained from the hysteresis loop m…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsDielectric materials and actuators
Jong‐Soo Lee、Jiyong Lim、Z. G. Khim 等 6 位作者2003-04-03Journal of Applied Physics
We report on the magnetic and structural properties of epitaxial metal organic chemical vapor deposition grown p-GaN:Mg/Al2O3 implanted with Co, Cr, and V ions at varying high doses at 350 °C. Magnetic and structural properties were investigated after a short anneal at 700 °C to remove implantation damage. Magnetic pr…
ZnO doping and propertiesGaN-based semiconductor devices and materialsSemiconductor materials and devices
Bohuslav Rezek、C. Sauerer、Christoph E. Nebel 等 8 位作者2003-04-03Applied Physics Letters
Atomic force microscopy and Kelvin probe experiments are applied to characterize hydrogen terminated patterns contacted with gold and aluminum on (100) diamond surfaces. On hydrogen terminated diamond the work function of 4.9 eV is detected, with an accuracy of about 0.1 eV. Taking into account the negative electron a…
Diamond and Carbon-based Materials ResearchForce Microscopy Techniques and ApplicationsIon-surface interactions and analysis