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 crystal structure of hexagonal yttrium trioxomanganate has been determined at room temperature and at 180 K. It is isomorphous with LuMnO(3). The Mn displacement vector has a frustrated component in the ab plane and a ferroelectric part along the c axis. The net ferroelectricity is zero due to inversion twinning,…
The magnetic properties of nonstoichiometric cobalt ferrite nanocrystals differing by their sizes were investigated by magnetic measurements and Fe57 Mössbauer spectroscopy. We found that the spin-wave Bloch exponent increases with increasing particle size, in agreement with previous studies. Under a magnetic field of…
The new phases, Na 4 M 3 (PO 4 ) 2 (P 2 O 7 ) (M = Mn, Co, Ni), have been synthesized by solid-state reactions. Single crystals of Na 4 M 3 (PO 4 ) 2 (P 2 O 7 ) (M = Mn, Ni) have been isolated and their structure has been determined by X-ray diffraction techniques using as the starting model the structure of the isost…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNovel Templating Synthesis of Necklace-Shaped Mono- and Bimetallic Nanowires in Hybrid Organic−Inorganic Mesoporous MaterialAtsushi Fukuoka, Yuzuru Sakamoto, Shiyou Guan, Shinji Inagaki, Noriaki Sugimoto, Yoshiaki Fukushima, Kaori Hirahara, Sumio Iijima, and Masaru Ich…
In this work the critical behaviour of films of La 0.7 Ba 0.3 MnO 3 , La 0.7 Sr 0.3 MnO 3 , La 0.7 Ca 0.3 MnO 3 and (LaMn) 1-δ O 3 is studied. Apart from the La 0.7 Ca 0.3 MnO 3 film, each of these manganite films shows a continuous phase transition with mean-field critical exponents. The analysis of the critical ampl…
We show that incorporation of strong electron correlations into the Kohn-Sham scheme of band structure calculations leads to a modification of the standard model of the lanthanides and that this procedure removes the existing discrepancy between theory and experiment concerning the ground state properties. Within the…
The emerging ferroelectric technology needs a reliable model for the simulation of the ferroelectric capacitors. This model would play a crucial role in designing new ferroelectric nonvolatile memories. As a main requirement, such a model must allow the calculation of the polarization variations for an arbitrary volta…
Classical molecular-dynamics simulations have been carried out to investigate densification mechanisms in silicon dioxide thin films deposited on an amorphous silica surface, according to a simplified ion-beam assisted deposition (IBAD) scenario. We compare the structures resulting from the deposition of near-thermal…
This work adresses the question of the scaling behaviour of polyelectrolytes in solution for a realistic prototype: We show results of a combined experimental (light scattering) and theoretical (computer simulations) investigation of structural properties of poly (acrylic acid) (PAA). Experimentally, we determined the…
A Comment on PRL 85, 1480 (2000) by K.R. Roos and M.C. Tringides.
It is demonstrated that the commonly applied self interaction correction (SIC) used in density functional theory does not remove all self interaction. We present as an alternative a novel method which, by construction, is totally free from self interaction. The method has the correct asymptotic 1/r dependence. We appl…
The linear and nonlinear melt state viscoelastic properties for a series of layered silicate based intercalated polymer nanocomposites are studied to elucidate the role of highly anisotropic nanometer thick layers in altering the flow properties of such hybrids. The steady shear viscosities for the nanocomposites exhi…
The crystallization behavior of Ge2Sb2Te5 thin films has been analyzed by atomic force microscopy and optical reflection measurements on various time scales in order to determine the crystallization kinetics including the crystallization mechanism, the corresponding activation barrier, and the Avrami coefficient. On t…
It is shown that during non-stationary heat flow in a metal the condition of charge neutrality inside the metal is violated by transient space charges which accompany the temperature relaxation. As expected for an effect of thermoelectricity, the magnitude of the space charges is small. It depends on a new parameter Q…
Thin (300 nm) porous silicon layers have been formed on p-doped silicon substrate to be characterized by x-ray reflectivity. The objective was to determine the layer thickness, the depth profile of the porosity and the interface roughness as functions of the anodization conditions. A very intense synchrotron beam was…
It is shown that fluorapatite needles formed in SiO 2 −Al 2 O 3 −CaO−P 2 O 5 −K 2 O−F - glasses upon heat treatment at 1200 °C undergo a time-dependent coarsening that fulfills the criteria of Ostwald ripening. Thermodynamic considerations imply that different growth mechanisms (normal and spiral growth) along differe…
Abstract The O 2 plasma treatment of self‐assembled monolayers (SAMs) of octadecyl mercaptan on gold substrates was investigated as a model for the oxidation of wool fiber surfaces. Three controlled low‐pressure gas‐plasma treatments were employed in which the active species were (i) atomic oxygen, (ii) atomic oxygen…
The development of three new self-polymerizable quinoxaline monomers was pursued in an attempt to increase the susceptibility of the monomers toward aromatic nucleophilic substitution reactions. The polymerizations were carried out in N -methyl-2-pyrrolidinone in the presence of potassium carbonate, to yield high mole…
Ternary blends based on a stoichiometric mixture of diglycidyl ether of bisphenol A (DGEBA) and 4,4‘-diaminodiphenyl sulfone (DDS), monodisperse polystyrene (PS, 8.3 × 10 4 g/mol), and monodisperse poly(methyl methacrylate) (PMMA, 8.86 × 10 4 g/mol) were polymerized at constant temperature. Blends containing a total a…
Abstract Homopoly( L ‐lactide) and homopoly( D,L ‐lactide) were almost inert for biodegradation with tricine buffer or normal enzymes such as bromelain, pronase, and cholesterol esterase but biodegradable with proteinase K. Significantly enhanced biodegradation was observed when an optically active ( R )‐ or ( S )‐3‐m…