Materials Literature
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Molecular beam epitaxial methods have been used to grow single crystal Laves phase DyFe2/YFe2 superlattice samples with a (110) growth direction. Detailed magnetization curves have been obtained for YFe2 dominated multilayer samples [wDyFe2/4wYFe2]×16 with w=45, 50, and 55 Å. In particular, it is shown that the format…
We report on a strong intrinsic optical anisotropy of Si induced by its dielectric patterning. As a result, an in-plane birefringence for nanostructured (110) Si surfaces is found to be 104 times stronger than that observed in bulk silicon crystals. We found the value of birefringence to be strongly dependent on the d…
We report some time-dependent behavior of lyotropic lamellar phase under shear flow. At fixed stress, near a layering instability, the system presents an oscillating shear rate. We build up a new stress versus shear rate diagram that includes temporal behavior. This diagram is made of two distinct branches of stationa…
Electromigration in 0.27 μm wide Cu damascene interconnections has been investigated. The results show that the electromigration time to failure of Cu interconnections is greatly influenced by the thickness of the metal liner at the contact between the via and underlying line. A remarkably long lifetime was achieved w…
The magnetic response of a ferrimagnetic/ferrimagnetic superlattice, $[{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}(20\AA{})/{\mathrm{Mn}}_{3}{\mathrm{O}}_{4}(80\AA{}){]}_{x20},$ is measured as a function of external field (-50--50 kOe) and temperature (5--300 K). A compensation point ${(T}_{\mathrm{cp}})$ is identified \ensurem…
Raman spectra of La(0.75)Ca(0.25)MnO(3) have been collected for the first time over a wide pressure range (0-14 GPa) using a diamond anvil cell. The frequency range explored (200-1100 cm(-1)) and the very good quality of the data allowed us to carefully analyze the pressure evolution of the phonon modes of the MnO(6)…
The CNx/carbon nanotube junctions were successfully synthesized by microwave plasma-assisted chemical vapor deposition method from the mixture of N2/CH4 and H2/CH4 gases in a continuous growth process. High resolution transmission electron microscopy revealed that these junctions were of heterostructure between CNx na…
Dielectric relaxation measurements on supercooled triphenyl phosphite show that time-temperature superposition (TTS) is obeyed for the primary relaxation process at low temperatures. Measurements on other molecular liquids close to the calorimetric glass transition indicate that TTS is linked to an omega(-1/2) high-fr…
Taking the pseudobinary C15-Laves phase compound Ce(Fe$_{0.96}$Al$_{0.04}$)$_2$ as a paradigm for studying a ferromagnetic(FM) to antiferromagnetic(AFM) phase transition, we present interesting thermomagnetic history effects in magnetotransport measurements across this FM-AFM transition. We argue that these distinctiv…
The reptation concept in polymer dynamics is studied for model chains with added stiffness. The main idea of a chain diffusing inside a tube can be transferred from fully flexible chains. However, the picture, which renormalizes the chain of locally stiff Kuhn segments onto a flexible chain of fewer segments fails. Th…
Using a first-principles density functional approach, we calculate the first-order Raman intensities of \ensuremath{\alpha}-quartz. The dynamical charge tensors, vibrational frequencies and eigenmodes, and polarizability tensors are obtained within a perturbational approach. We calculate Raman intensities by evaluatin…
We have grown well-aligned carbon nanotube arrays by thermal chemical vapor deposition at 800 °C on Fe nanoparticles deposited by a pulsed laser on a porous Si substrate. We also attain a selective growth of carbon nanotubes on a patterned Fe film on Si substrates in terms of pulsed laser deposition and a liftoff patt…
We have analyzed the constant loss contribution to the ac conductivity in the frequency range 10 Hz--1 MHz and temperatures down to 8 K, for two Li ionic conductors, one crystalline ( ${\mathrm{Li}}_{0.18}{\mathrm{La}}_{0.61}{\mathrm{TiO}}_{3}$) and the other glassy ( $61{\mathrm{SiO}}_{2}\ifmmode \dot{}\else \.{}\fi{…
Amorphous silicon quantum dots ( $a\ensuremath{-}\mathrm{Si}$ QDs) were grown in a silicon nitride film by plasma enhanced chemical vapor deposition. Transmission electron micrographs clearly demonstrated that $a\ensuremath{-}\mathrm{Si}$ QDs were formed in the silicon nitride. Photoluminescence and optical absorption…
We report on the magnetic properties of an oxide-diluted magnetic semiconductor (DMS), Zn0.64Mn0.36O. The temperature dependence of the magnetization shows a spin-glass behavior with the large magnitude of the Curie–Weiss temperature, corresponding to a stronger antiferromagnetic exchange coupling than other II–VI DMS…
Alternation of melting points in the series of odd- and even-numbered monoacid triacylglycerols has been known for a long time, but hitherto little experimental evidence has been available to support existing theories. In this paper the melting point alternation of β-C n C n C n -type triacylglycerols is discussed, ba…
The new pnictide oxide Sr 2 MnZn 2 As 2 O 2 is reported. The crystal structure of this compound consists of a 1:1 intergrowth of square-planar MnO 2 2 - layers and ThCr 2 Si 2 -type Zn 2 As 2 2 - layers interspersed by Sr cations. This compound has been prepared by sintering the stoichiometric ratio of SrO, Mn, Zn, an…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFormation of Unsymmetrical Polyoxotungstates via Transfer of Polyoxometalate Building Blocks. NMR Evidence Supports the Kinetic Stability of the Pentatungstate Anion, [W5O18]6-, in Aqueous SolutionNebebech Belai, Masahiro Sadakane, and Michael T. PopeView Author Inform…
Both polymer blends and diblock copolymers have been investigated with small-angle neutron scattering (SANS) in varying temperature and pressure fields. Four samples were studied: a polymer blend of near critical composition and the corresponding symmetric diblock copolymer of poly(ethylethylene) (PEE) and poly(dimeth…
In the present work, a generalization of some of the interpretations of heterogeneous catalysis to the case of oxide film electrocatalysts has been attempted, using conductive boron-doped diamond supports. The very high stability of this material allowed the study of the catalytic properties of noble-metal oxide modif…