Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Artificial ${\mathrm{PbTiO}}_{3}/{\mathrm{SrTiO}}_{3}$ superlattices were constructed using off-axis rf magnetron sputtering. X-ray diffraction and piezoelectric atomic force microscopy were used to study the evolution of the ferroelectric polarization as the ratio of ${\mathrm{PbTiO}}_{3}$ to ${\mathrm{SrTiO}}_{3}$ w…
This review covers important advances in recent years in the physics of thin-film ferroelectric oxides, the strongest emphasis being on those aspects particular to ferroelectrics in thin-film form. The authors introduce the current state of development in the application of ferroelectric thin films for electronic devi…
The electronic and piezoelectric properties of the boron nitride (BN) nanotubes are investigated with the hybrid density functional (B3LYP) method. We first study bulk h-BN and BN sheet and find that the B3LYP band structure and energy gap are consistent with the GW results. The B3LYP band gap is larger than the LDA o…
We have modified Landau-Khalatnikov approach and shown that the pyroelectric response of inhomogeneous ferroelectric-semiconductor films can be described by using six coupled equations for six order parameters: average displacement, its mean-square fluctuation and correlation with charge defects density fluctuations,…
Abstract On irradiation with UV light, the photochromic dimer of 1,4-bis(imidazolyl)tetrafluorobenzene produced the colored transient species in solution and solid. Though the dimerization reaction to form the photochromic dimer prevents the isolation and characterization of the colored species at room temperature, th…
This article reports the results of an experimental and computational study on the reaction of trimethylindium, In(CH3)(3), adsorbed on TiO2 nanoparticle films. Experimentally, Fourier transform infrared (FTIR) spectra have been measured by varying In(CH3)(3) dosing pressure, UV irradiation time in the absence and pre…
The surface electronic structure of 1500-Å-thick Fe3O4(100) films has been investigated by spin-resolved photoemission spectroscopy with vacuum ultraviolet synchrotron radiation. The films, epitaxially grown on MgO(100) substrates using plasma-assisted molecular-beam deposition, are briefly exposed to air during trans…
Calculations are presented for the structural, electronic, and vibrational properties of the different Ti8C12 metallocarbohedrynes. (Please note that we adopt the name "metallocarbohedrynes" instead of "metallocarbohedrenes" to denote the acetylenic nature of C2 units in this class of clusters demonstrated by several…
Abstract Highly selective formation of benzophenone (99.1%) from diphenylmethane is reported for the first time using H2O2 (30%) as an oxidant and Co/MCM-41 as the catalyst.
Substantial photoinduced changes of ultraviolet (UV) -visible (UV-vis) optical spectra were observed for the Au nanoparticles prepared by a “touch” seed-mediated growth technique on the surface of indium-tin-oxide substrate. The phototreatment was performed by two-color coherent laser beams with a wavelength of 1060 n…
The self-assembly behavior of the complexes of DNA with fully surface-protonated poly(amidoamine) (PAMAM) dendrimer of generation four has been studied as a function of the overall complex composition. The complex composition ( x ) was expressed by the molar ratio of the positively charged ammonium groups in the dendr…
Thin V2O3 films were deposited on a piezoelectric substrate by electron-beam evaporation. Surface acoustic waves were generated by interdigital transducers. The attenuation and sound velocity were investigated from 260 to 10 K, providing an insight into the temperature-dependent electrical, dielectrical, and elastic p…
Abstract One-dimensional coordination polymer of [Ru2(piv)4(μ-CN)W(CN)7]n2n− (Hpiv = pivalic acid) has been synthesized in the presence of PPh4+. The X-ray crystal structure reveals an alternating arrangement of ruthenium(II,III) dimers and [W(CN)8]3− ions in a 1-D chain. The magnetic susceptibility data (4.5–300 K) s…
In ferroelectric materials, hysteresis behavior is very difficult to model due to its nonlinear and history-dependent characteristics. Among approaches that are able to describe unsaturated loops, many of them are either very complicated (numerical procedures must be employed) or the resulting loops contain some undes…
We have synthesized ferroelectrics of M6Ti2Nb8O30 (M=Ba, Sr) with filled tungsten-bronze structure. The microstructures and dielectric properties of the present materials have been investigated as well as the behavior and features of the ferroelectric phase transition. Similar to perovskite ABO3, tungsten-bronze struc…
The gallium-modified bismuth ferrite-lead titanate compositions of 0.4Bi(Ga0.4Fe0.6)O3-0.6PbTiO3 (0.4BGF-0.6PT), has been investigated for the potential as a high-field and high-temperature piezoelectric ceramic. The crystalline solutions of 0.4BGF-0.6PT were fabricated by using the solid-state reaction method. X-ray…
The effects of Ca doping on the Curie temperature, structural, dielectric, and elastic properties of Ba0.4Sr0.6−xCaxTiO3 (0⩽x⩽0.3) has been studied. Powder x-ray diffraction revealed that the cubic lattice constant a decreases linearly with increasing x from 0 to 0.15, while showing an anomalous expansion between x=0.…
We have used molecular-dynamics simulations to examine the displacement threshold energy (Ed) surface for cations and anions in Gd2Ti2O7 and Gd2Zr2O7 pyrochlores. In both pyrochlores, the Ed surface is highly anisotropic and it requires less energy to displace anions than cations. Both anion and cation Ed values are h…
We report an enhancement effect of ultraviolet illumination on the photoluminescence intensities of zinc oxide thin films. Large-grain ⟨0001⟩-textured zinc oxide thin films were deposited on amorphous-fused silica substrates using pulsed laser deposition. We found that the intensities of excitonic emission and green-b…
An investigation was carried out by dielectric relaxation spectroscopy (DRS) and dynamic mechanical spectroscopy (DMS) on the dynamics of aqueous solutions of deoxyribonucleic acid (DNA). Novel information is generated and presented through our use of wide temperature and frequency range in DRS and DMS measurements. T…