Materials Literature
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0.2 Pb(Mg 1/3 Nb 2/3 )O 3 –0.8Pb(Zr 0.5 Ti 0.5 )O 3 (0.2PMN–0.8PZT) thin films were deposited on Pt(111)/Ti/SiO2/Si [Pt(111)] and Pt(200)/SiO2/Si [Pt(200)] substrates by a sol–gel method, and the effect of orientation on the piezoelectric and dielectric properties of 0.2PMN–0.8PZT thin films was investigated. The 0.2P…
Abstract A novel diamine, bis‐(3‐aminophenyl)‐4‐(trifluoromethyl)phenyl phosphine oxide (mDA3FPPO), containing phosphine oxide and fluorine moieties was prepared via the Grignard reaction from an intermediate, 4‐(trifluoromethyl)phenyl diphenyl phosphine oxide, that was synthesized from diphenylphosphinic chloride and…
The conducting oxide (Ba,Sr)RuO3 (BSR), which offers an appropriate match in structure with (Ba,Sr)TiO3 (BST), was investigated as an interfacial layer to obtain a high tunability and high dielectric constant in BST films. The (100)-textured BST films deposited onto BSR interfacial layers showed smoother smaller grain…
The local optical density of states (LDOS) in 340-nm-diam ${\mathrm{SiO}}_{2}$ spherical microcavities was calculated and probed experimentally by measuring the luminescence decay rate at 1.54 \ensuremath{\mu}m of erbium ions implanted in the colloids. To separate the effect of nonradiative processes, first the radiat…
We present the results of a theoretical study of a body-centered-tetragonal (BCT) phase of carbon nitride (CN) with 1:1 stoichiometry using a self-consistent-charge density-functional tight-binding method. This CN phase is highly stable and has a small $c/a$ ratio of 0.34 with complicated N and C dimerization along th…
As a possible atomic coordination of erbium dopants surrounded by oxygen, a molecular orbital calculation of an ErO6 cluster can predict a C4v pseudo-octahedral structure with Er distortion of ∼0.1 Å from the octahedral center. It was found that bond alternation by a “rack and pinion effect” can minimize the electron…
Abstract The water diffusion behaviors and activation energies of PDA‐ and ODA‐based polyimide thin films were quite dependent on both the chemical structure and the morphological structure in the films. The water diffusion coefficients of polyimide thin films increased with increasing temperature. The activation ener…
The current-induced emission degradation of a carbon nanotube (CNT) thin-film electron emitter is studied under constant emission current for different current levels, using a scanning anode field emission microscope. A permanent emission degradation is observed for emission currents higher than 300 nA per CNT and is…
We present a computer simulation of strain effects on the electronic spectrum of 100 Å diam Si nanocrystal (nc-Si) quantum dots embedded in SiO2, based on the continuum strain model and deformation potential theory. We show that the coupling between the nc-Si geometry and the symmetry generated by the strain potential…
X-ray diffraction, neutron diffraction, and susceptibility measurements were performed on ${}^{7}{\mathrm{LiMn}}_{2}{\mathrm{O}}_{4}$ powder specimen. The Jahn-Teller lattice distortion induces a phase transition from cubic to orthorhombic structure at $T=283.5\mathrm{K}$ on cooling. A series of well-defined magnetic…
Abstract A blend system prepared from epoxy resin (EP) and polyurethane (PU) was investigated in terms of glass‐transition temperature ( T g ), contact angle, mechanical interfacial, and mechanical properties. Deionized water and diiodomethane were chosen as the angle testing liquids. In this work, the models of Owens…
Abstract Dissolution of Antheraea pernyi silk fiber was carried out in a calcium nitrate solution with various dissolving conditions. The solubility was significantly dependent on the concentration of calcium nitrate, dissolving temperature, and time. The proper conditions of dissolution were found as 7 M calcium nitr…
The development of lead zirconate titanate (PZT)-based capacitors has been a long time goal of ferroelectric random access memories (FRAM). However, PZT-based perovskites with common platinum (Pt) electrodes have suffered from a significant reduction of the remanent polarization (Pr) after a certain number of read/wri…
Piezoelectric investigations of 〈011〉-oriented Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) and Pb(Zn1/3Nb2/3)O3–PbTiO3 (PZN–PT) crystals have revealed high electromechanical properties. Piezoelectric constants of up to 5000–6000 pC/N and electromechanical coupling coefficients of up to 0.95 have been observed near the ferroelect…
The quantum-confined Stark effect in a single self-assembled CdSe/ZnSe quantum dot was studied by means of highly spatially resolved photoluminescence spectroscopy. A nanotechnological approach making use of a capacitor-like geometry enabled us to apply a well-defined lateral electric field on the quantum dots. Stark…
The field-emission mechanism of open-ended single-walled carbon nanotubes (SWNTs) is studied. Owing to electronic effects that directly alter the bonding mode and remarkably influence the work function, an open-ended SWNT has much better field-emission properties than a closed SWNT; owing to geometrical effects that s…
Xenopus oocytes assemble an array of F-actin and myosin 2 around plasma membrane wounds. We analyzed this process in living oocytes using confocal time-lapse (four-dimensional) microscopy. Closure of wounds requires assembly and contraction of a classic "contractile ring" composed of F-actin and myosin 2. However, thi…
A potential disadvantage of real-space-grid electronic structure methods is the lack of a variational principle and the concomitant increase of total energy with grid refinement. We show that the origin of this feature is the systematic underestimation of the kinetic energy by the finite difference representation of t…
We present the circuit equivalent of the Landau-Khalatnikov dynamical ferroelectric model. The differential equation for hysteretic behavior is subject to numerical computer simulations. The size and shape of the simulated hysteretic loops depends strongly on the frequency and the amplitude of the driving electric fie…
Highly ordered hexagonal arrays of parallel metallic nanowires (Ni, Bi) with diameters of about 50 nm and lengths up to 50 μm were synthesized by electrodeposition. Hexagonal-close-packed nanochannel anodized aluminum oxide film was used as the deposition template. The deposition was performed in an organic bath of di…