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。
The structural properties of ${\mathrm{LaCoO}}_{3}$ were studied by means of high-resolution neutron powder diffraction in the temperature range $5<~T<~1000\mathrm{K}.$ Changes of the ${\mathrm{Co}}^{+3}$ spin states in this temperature interval are shown to affect not only the unit-cell volume, as previously kn…
Gold nanoshells have been synthesized by reacting aqueous HAuCl4 solutions with solid templates such as silver nanoparticles. The morphology, void space, and wall thickness of these hollow nanostructures were all determined by the templates, which were completely converted into soluble species during the replacement r…
The dielectric properties, internal friction, and Young’s modulus of (1−x%) Pb(Mg1/3Nb2/3)O3−x%PbTiO3 (for x=13, 23, and 33) ceramics have been measured. A phase-transition-like internal friction peak associated with Young’s modulus softening has been observed at temperature TR–F, which can be attributed to the relaxo…
The spherulitic growth mechanism of lysozyme crystals from aqueous solutions was examined quantitatively by taking advantage of a “buffer zone” of liquid–liquid phase separation occurring in lysozyme aqueous solution. This buffer zone technique allows us to obtain constant concentrations in both liquid phases during t…
The adopted crystal structure of the $\mathrm{AB}{\mathrm{O}}_{3}$ perovskites is determined by the balance between the interaction of the semicore states of the A and B atoms and oxygen ions. Topological considerations show that the structural setup always stabilizes the cubic phase at large pressures, while small or…
Epitaxial SrBi2Nb2O9 thin films have been grown by pulsed-laser deposition on (110)Pt bottom electrode epitaxially grown on (110) SrTiO3 by dc sputtering. X-ray φ-scans and electron channeling patterns reveal the epitaxial growth of the (116) SrBi2Nb2O9/(110)Pt bilayers. The hysteresis loop, dielectric response, and c…
First-principles total-energy calculations on hexagonal-close-packed (hcp) and body-centered-tetragonal (bct) states of bulk elemental magnesium have been made with a full-potential electronic structure program with both the local-density approximation and the generalized gradient approximation. The unique paths [call…
We have characterized a diamond p-n junction by means of electron-beam-induced current (EBIC) and cathodoluminescence (CL). The diamond p-n junction was fabricated by growing a B-doped p-type layer and a P-doped n-type layer on the {111} diamond substrate by microwave plasma enhanced chemical vapor deposition. The cro…
We report energy dispersive x-ray diffraction studies on nanocrystalline hexagonal graphite samples (average grain size=12 nm) in a diamond-anvil cell to 65 GPa at room temperature. A structural phase transition to a hexagonal diamond phase beginning at 15 GPa is completed at 55 GPa, and is reversible on decompression…
Measurements of thermal conductivity $(\ensuremath{\kappa})$ vs temperature are reported for a series of ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{MnO}}_{3}(0<~x<~0.2)$ specimens. For the undoped $(x=0),$ G-type antiferromagnetic compound a large enhancement of $\ensuremath{\kappa}$ below the Ne…
Thin-film single-wall carbon nanotube (SWNT) composites synthesized by pulsed laser deposition (PLD) are reported. Ultrahard, transparent, pure-carbon, electrically insulating, amorphous diamond thin films were deposited by PLD as scratch-resistant, encapsulating matrices for disperse, electrically conductive mats of…
We have investigated the ferroelectric domain structure formed in a Sr0.61Ba0.39Nb2O6 single crystal by cooling the crystal through the Curie point. Imaging the etched surface structure using a scanning force microscope (SFM) in both the topographic mode and the piezoresponse mode revealed that a multidomain structure…
The ferroelectric and piezoelectric properties of (001) BiScO3–PbTiO3 epitaxial films were investigated. Epitaxial films 1 μm thick were grown by pulsed laser deposition using ceramic targets of (1−x)BiScO3–xPbTiO3 (x=0.5) at substrate temperatures of 700 °C on (100) SrRuO3/(100)LaAlO3 substrates. Well-saturated hyste…
In recent years the generation of optical harmonics in molecular systems has become an area of increasing interest for a number of reasons. First, many organic crystals and polymeric solids prove not only to have usefully large optical nonlinearities but also to be surprisingly robust and thermally stable. Consequentl…
The diffusion and reactions of hydrogenous species generated by single-pulsed ${\mathrm{F}}_{2}$ laser photolysis of SiO-H bond in ${\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$ glass were studied in situ between 10 and 330 K. Experimental evidence indicates that atomic hydrogen (${\mathrm{H}}^{0}$) becomes mobile even at tem…
An all-organic printed electrochemical rectifier is reported. The device is based on a patterned layer of poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate) (PEDOT:PSS) that interfaces a patterned electrolyte top layer. Overlap between the electrolyte layer and the conducting polymer pattern results in the forma…
The reaction of [Mn3O(OAc)6(py)3] with 1,1,1-tris(hydroxymethyl)ethane (H3thme) gives the Mn(IV)3Mn(III)4Mn(II)2 complex [Mn9O7(OAc)11(thme)(py)3(H2O)2], which has an S = 17/2 ground state and displays strong out-of-phase signals in ac susceptibility studies that establish it as a new class of single-molecule magnet.
The effect of the magnetic anisotropy of the Nd–Co soft phase on its exchange field (Hex) is reported for epitaxial Sm–Co/Nd–Co bilayers. It is found that Hex gradually increases with anisotropy K of the soft phase. The experimental values of Hex as well as its variation with K are quantitatively interpreted using an…
We report visible luminescence from SiOx formed by microstructuring silicon surfaces with femtosecond laser pulses in air. Incorporation of oxygen into the silicon lattice occurs only where the laser beam strikes the surface. Laser microstructuring therefore offers the possibility of writing submicrometer luminescent…
Two-dimensional images of model integrated circuit components were collected using the technique of scanning confocal electron microscopy. For structures embedded about 5 μm below the surface of a silicon oxide dielectric, a lateral resolution of 76±9 nm was measured. Elemental mapping via x-ray emission spectrometry…