Esa Bose、Subir Karmakar、B. K. Chaudhuri 等 7 位作者2007-06-15Journal of Physics Condensed Matter
Samples of the low-doped manganite La(0.875)Sr(0.125-x)Ca(x)MnO(3) (0≤x≤0.125) have been synthesized and the effect on the structural, magnetic and transport properties of decreasing the tolerance factor by replacing larger Sr(2+) ions with smaller Ca(2+) ions are reported. For samples with x≥0.0625, a concentration (…
Magnetic and transport properties of perovskites and related materialsRare-earth and actinide compoundsAdvanced Condensed Matter Physics
Harold T. Stokes、Branton J. Campbell、Dorian M. Hatch2007-06-15Acta Crystallographica Section A Foundations of Crystallography
Phase transitions that result in incommensurate structural modulations are widely observed in crystalline solids and are relevant to a broad range of physical phenomena in magnetic, electronic, optical and structural materials. While the (3+1)-dimensional superspace-group symmetries associated with one-dimensional mod…
Crystal Structures and PropertiesOrganic and Molecular Conductors ResearchSolid-state spectroscopy and crystallography
Wei Guo2007-06-15Key engineering materials
In the present paper, in order to better understand the third type “dynamic strain aging” occurring during the plastic flow of metals, the uniaxial compressive experimental data ever obtained in University of California, San Diego using an Instron servo-hydraulic testing machine and the Hopkinson technique are systema…
Laser-Plasma Interactions and DiagnosticsHigh-Velocity Impact and Material BehaviorStructural Response to Dynamic Loads
Jong Jin Choi、Joo Hee Jang、Dong Soo Park 等 6 位作者2007-06-15Diffusion and defect data, solid state data. Part B, Solid state phenomena/Solid state phenomena
Lead zinc niobate (PZN) added lead zirconate titanate (PZT) thick films with thickness of 5~10 μm were fabricated on silicon and sapphire substrates using aerosol deposition method. The contents of PZN were varied from 0, 20 and 40 %. The as deposited film had fairly dense microstructure without any crack, and showed…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesMicrowave Dielectric Ceramics Synthesis
F Ren、Changzhong Jiang、Xiangheng Xiao2007-06-15Nanotechnology
Zn ions were implanted at 160 keV into silica at a dose of 2 × 10 17 ions cm −2 . Cross-sectional transmission electron microscopy and x-ray photoelectron spectroscopy studies show that a film of ZnO nanoclusters was formed after the implanted sample was annealed at 700 °C in air. With the increase in annealing temper…
ZnO doping and propertiesQuantum Dots Synthesis And PropertiesCopper-based nanomaterials and applications
Laura Miranda、Khalid Boulahya、Áurea Varela 等 9 位作者2007-06-15Chemistry of Materials
The crystal structure of BaMn 0.4 Fe 0.6 O 2.73, a recently identified oxygen-deficient 10H-type hexagonal perovskite in the system BaMn 1 - x Fe x O 3 - y, has been established by a combination of electron microdiffraction and neutron diffraction. The structure (space group P 6 3 / mmc, a = 5.74435(5) Å, and c = 24.0…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsDielectric properties of ceramics
Vineet Kumar Rai、Leonardo de S. Menezes、Cid B. de Araújo2007-06-15Journal of Applied Physics
Optical properties of Pr3+ doped TeO2–PbO glass were investigated by resonant excitation of H43→D21 transition at ∼586nm. The decay time of D21 level, the energy transfer (ET) rates from the D21 level to other Pr3+ states, and the frequency upconversion process which leads to emission at 484nm (P03→H43 transition) wer…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsPhotorefractive and Nonlinear Optics
L.R.P. Kassab、Renata A. Kobayashi、Maria José Valenzuela Bell 等 5 位作者2007-06-15Journal of Physics D Applied Physics
This work presents a study of the thermal lens technique to quantify the thermo-optical coefficients d s /d T (optical path change with temperature), thermal diffusivity and conductivity of tellurite glasses doped with Yb 3+ . The glasses present binary, ternary and quaternary compositions. Yb 3+ ions allow the determ…
Glass properties and applicationsPhase-change materials and chalcogenidesOptical properties and cooling technologies in crystalline materials
Hiroshi Ono、Shinji Oikawa、Nobuhiro Kawatsuki2007-06-15Journal of Applied Physics
The liquid crystal phase gratings were prepared using a polarization holographic exposure on poly(vinyl cinnamate) or photocross-linkable polymer liquid crystal (PCLC) films. Anchoring strength between the photoalignment layer and low-molar-mass liquid crystal is a very important role to realize the liquid crystal gra…
Photonic and Optical DevicesLiquid Crystal Research AdvancementsPhotonic Crystals and Applications
Claude Klein2007-06-15Journal of Applied Physics
Recently, it has been argued [N. M. Pugno and R. S. Ruoff, J. Appl. Phys. 99, 024301 (2006)] that available carbon-nanotube (CNT) tensile strength data do not obey the “classical” Weibull statistical model. In this paper we formulate Weibull’s theory in a manner suitable for assessing CNT fracture-strength data and de…
Carbon Nanotubes in CompositesGraphene research and applicationsForce Microscopy Techniques and Applications
J. T. Titantah、D. Lamoen、Marco Schowalter 等 4 位作者2007-06-15Journal of Applied Physics
In this work we show that a reparametrized Tersoff potential accurately reproduces the bond length variations observed in ternary Ga1−xInxAs mixed crystals. The reparametrization is based on accurate first-principles electronic structure calculations. Previous parametrizations of the Tersoff potential for GaAs and InA…
High-pressure geophysics and materialsMachine Learning in Materials ScienceSuperconductivity in MgB2 and Alloys
Ming Jin、Ran Lu、Qingxin Yang 等 7 位作者2007-06-15Journal of Polymer Science Part A Polymer Chemistry
Abstract The preparation of a series of novel homopolymers and copolymers containing bisazobenzene chromophores with side‐on structure in the side chains via atom transfer radical polymerization (ATRP) were presented. UV–vis spectra of the thin films of these polymers under irradiation of 488 nm Ar + laser suggested t…
Advanced Polymer Synthesis and CharacterizationPhotochromic and Fluorescence ChemistryPhotopolymerization techniques and applications
Xifa Long、Zuo‐Guang Ye2007-06-15Journal of Applied Physics
A new solid solution of (1−x)Ba(Zn1∕3Nb2∕3)O3−xPbTiO3 [(1−x)BZN−xPT] has been synthesized in the form of ceramics by solid state reactions and characterized by means of x-ray diffraction, dielectric spectroscopy, and ferroelectric measurements. A partial solid state phase diagram of the binary system is established. I…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsMicrowave Dielectric Ceramics Synthesis
Ken Maruyama、Hiroto Kudo、Takayuki Ikehara 等 7 位作者2007-06-15Macromolecules
The synthesis and photopolymerization of alkaline-developable hyperbranched polyurethane (HBPUMA-COOH) were examined. The reaction of dicyclohexylmethane 4,4‘-diisocyanate (CMDI) and trimethylolpropane (TMP) in the presence of 2-methacryloyloxyethyl isocyanate (MOI) was carried out to give the soluble hyperbranched po…
Advanced Polymer Synthesis and CharacterizationDendrimers and Hyperbranched PolymersSynthesis and properties of polymers
Paola Benzi、Elena Bottizzo、Chiara Demaria 等 6 位作者2007-06-15Journal of Applied Physics
Hydrogenated germanium carbides have been produced by x-ray activated–chemical vapor deposition from germane/ethyne or germane/allene systems. The chemical composition and structure of the reaction products as a function of the hydrocarbon percentage in the irradiated mixture and of the solid annealing temperature hav…
Semiconductor materials and devicesGlass properties and applicationsSilicon Nanostructures and Photoluminescence
Gil Refael、Jinseong Heo、Marc Bockrath2007-06-15Physical Review Letters
In this Letter we study electron interference in nanotube loops. The conductance as a function of the applied voltage is shown to oscillate due to interference between electron beams traversing the loop in two opposite directions, with slightly different velocities. The period of these oscillations with respect to the…
Carbon Nanotubes in CompositesQuantum and electron transport phenomenaMechanical and Optical Resonators
Yo‐Sep Min、Eun Ju Bae、Igor Asanov 等 5 位作者2007-06-15Nanotechnology
Nitrogen-doped single-walled carbon nanotubes (N-SWNTs) are directly grown on SiO 2 /Si substrates at 450 °C with methane and ammonia gases by water-plasma chemical vapour deposition. The strongest radial breathing mode peak in Raman spectra of the grown N-SWNTs, probed with a 633 nm laser excitation, was assigned to…
Carbon Nanotubes in CompositesGraphene research and applicationsDiamond and Carbon-based Materials Research
D.N. Boccaccini、Marcello Romagnoli、Paolo Veronesi 等 8 位作者2007-06-15International Journal of Applied Ceramic Technology
Ultrasonic pulse velocity testing was carried out to perform nondestructive quality control of refractory plates used as substrates in fast firing of porcelain whiteware. Two cordierite‐mullite refractory compositions characterized by different microstructure morphologies and crack propagation behavior were investigat…
Advanced ceramic materials synthesisAdvanced materials and compositesNuclear materials and radiation effects
Stephan Angloher、Johann Kecht、Thomas Bein2007-06-15Chemistry of Materials
The modification of periodic mesoporous silica with organic groups following an optimized metalorganic route is described. Organolithium and Grignard reagents ( n -butyllithium and allyl-magnesium bromide) were used to directly substitute silicon atoms with organic moieties in the channel walls of the silica host. A d…
Catalytic Processes in Materials ScienceMesoporous Materials and CatalysisPolyoxometalates: Synthesis and Applications
John Hoang、T. T. Van、Monica Sawkar-Mathur 等 10 位作者2007-06-15Journal of Applied Physics
We report in this work the optical properties of Er3+-doped Y2O3, deposited by radical enhanced atomic layer deposition. Specifically, the 1.53μm absorption cross section of Er3+ in Y2O3 was measured by cavity ring-down spectroscopy to be (1.9±0.5)×10−20cm2, about two times that for Er3+ in SiO2. This is consistent wi…
Luminescence Properties of Advanced MaterialsSemiconductor materials and devicesGa2O3 and related materials