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。
Photoinduced phase transition from a charge-density-wave (CDW) state to a Mott-Hubbard (MH) insulator is studied theoretically. According to the very recent experiment [H. Matsuzaki et al., Phys Rev B 70, 035204 (2004)], a quasi-one-dimensional Br-bridged Pd compound, $[\mathrm{Pd}{(\mathrm{chxn})}_{2}][\mathrm{Pd}{(\…
We use a micromechanics approach to study the magnetoelectric (ME) properties of the piezoelectric/magnetostrictive composite with a 2–2 laminate structure and a 3–1 fibrous structure. It is found that the 3–1 composite has a higher ME coefficient than the 2–2 one, if the volume ratio of piezoelectric material is the…
The orientation distributions of α-Al 2 O 3 textured ceramics are determined from neutron diffraction spectra. A curved position-sensitive detector coupled to a tilt angle (χ) scan allowed the whole diffraction pattern treatment in the combined Rietveld−WIMV−Popa algorithm. Four textured alumina ceramics were prepared…
The underlying phenomenology of the crystallographic orientation dependence on ferroelectric fatigue behavior was investigated in rhombohedral Pb(Zn1∕3Nb2∕3)O3-5%PbTiO3 (PZN-5PT) crystals. It was recently found that an electric field (E field) application along the ⟨001⟩ direction of PZN-5PT crystal did not induce the…
Large-angle X-ray scattering (LAXS) measurements over a temperature range from 223 to 298 K have been made on methanol confined in mesoporous silica MCM-41 with two different pore diameters, 28 A (C14) and 21 A (C10), under both monolayer and capillary-condensed adsorption conditions. To compare the structure of metha…
Nd 2 Fe 14 B and Sm 2 Co 17 particles of submicrometre sizes have been prepared by ball milling in a magnetic field. Structural and magnetic characterization reveal that these submicrometre particles milled in a magnetic field, consisting of nanosize grains, exhibit strong magnetic anisotropy compared with the particl…
X-ray absorption fine structure (XAFS) experiments were carried out on a series of ferroelectric materials $\mathrm{Pb}{\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ (PZT) $(x=0.40,0.47,0.49,0.55)$ to study the local structure around Ti and Zr atoms in each sample. Based on the fact that PZT has a…
An efficient organic photoelectrochemical cell based on chlorophyll a (Chla) and gold nanoparticles is constructed. The enhanced performance of this cell is due to the beneficial role of gold nanoparticles in accepting and shuttling the photogenerated electrons in Chla to the collecting electrode. This produces a long…
We have contacted single-walled carbon nanotubes after aligning the tubes by the use of surface acoustic waves. The acoustoelectric current has been measured at $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and a probing of the low-dimensional electronic states by the surface acoustic wave has been detected. By decreasi…
We have extended the chemical bath deposition technique modified by microwave irradiation to rapidly deposit ternary oxide Eu:YVO 4 thin films. The obtained films are dense, adherent, and mirror-like. Structure (XRD), morphological (TEM), and optical (UV–vis–NIR and PL) characterizations of the films are presented. Th…
Among the several approaches developed for the fabrication of molecular crystals with noncentrosymmetric lattices, incorporation of chirality is the only one which guarantees it for fundamental symmetry reasons. One of the few quadratic nonlinear optical chromophores which form a large number of noncentric cocrystals/…
Hollow silica spheres with large mesopore wall structures have been synthesized via CO(2)-in-water emulsion templating in the presence of PEO-PPO-PEO block copolymers under supercritical fluid conditions.
The first-order monoclinic-to-orthorhombic (beta-->gamma) phase transition of the giant magnetocaloric material Gd(5)Si(2)Ge(2) was studied using in situ high-temperature single-crystal X-ray diffraction. A special crystal mounting procedure was developed to avoid crystal contamination by oxygen or nitrogen at high te…
Abstract A theory of the fracture of polymers with network microstructure was developed that was based on the vector, or rigidity percolation (RP) model of Kantor and Webman, in which the modulus, E , is related to the lattice bond fraction p , via E ∼ [ p − p c ] τ . The Hamiltonian for the lattice was replaced by th…
We have studied, in real time, the evolution of a thin (less than 200Å) copper film deposited onto an oxidized silicon surface using reflection high-energy electron diffraction. We show that quantitative measurements of island size and shape as functions of time are possible and the results are presented. While the fi…
Abstract A substantial approach to one‐dimensional (1D) electrically conductive composites was proposed which was based on the thermodynamic analysis of electric‐field‐induced particle alignment in a nonpolar thermoplastic polymer matrix. The process condition window was based on the real‐time exploration of dynamic p…
The dielectric behavior and the features of the diffused phase transition of the SrpSm6−pTi8−pNb2+pO30(p=4,5) ceramics were investigated together with their structure. Both Sr5SmTi3Nb7O30 and Sr4Sm2Ti4Nb6O30 had tungsten bronze structure and weak ferroelectric nature. Though Sr5SmTi3Nb7O30 showed the diffused ferroele…
The effect of 200MeV Ag ion irradiation on structural, electrical transport, magnetization, and low-frequency conduction noise properties of electron-doped La0.7Ce0.3MnO3 thin films have been investigated. The as-grown thin films show c-axis epitaxial structure along with a small amount of unreacted CeO2 phase. After…
We have investigated transport properties of carriers excited in high-quality homoepitaxial diamond (100) films by 5.6eV photons or 15keV electrons. The high-quality single-crystalline diamond films were homoepitaxially grown on type-Ib diamond substrates at a rate of 2.5μm∕h by high-power microwave-plasma chemical-va…
The chemical properties and electronic structures of atomically flat SrTiO3(001) substrates with various surface treatments have been investigated by high-resolution synchrotron-radiation photoemission spectroscopy. We have found that an annealing process causes the segregation of Sr oxides at the TiO2-terminated surf…