Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.Synthesis of Poly(n-hexyl isocyanate) by Controlled Anionic Polymerization in the Presence of NaBPh4Yeong-Deuk Shin, Sun-Young Kim, Jun-Hwan Ahn, and Jae-Suk LeeV…
A fast method for inducing alignment of microdomains in noncrystalline block copolymers is presented. The method is based on the use of crystalline organic materials, which are solvents for the block copolymers above their melting temperatures, and, when cooled and directionally crystallized, act as a substrate on whi…
Temperature programmed desorption was used to study the reaction of CH 3 OH on several different ceria-based model catalysts. These catalysts consisted of a CeO 2 (111) single crystal and thin ceria films supported on α-Al 2 O 3 (0001) and yttria-stabilized zirconia (100). The results of this study demonstrate that th…
Resistivity, due to spin-dependent scattering of carriers in ferromagnetic metals with localized spins, is studied to investigate the extraordinary behaviors of the resistivity, such as the giant magnetoresistance and the anomalous temperature dependence near the ferromagnetic transition temperature ${T}_{c}.$ The res…
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…