Materials Literature
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A discrete dislocation plasticity analysis of plastic deformation in metal thin films caused by thermal stress is carried out. The calculations use a two-dimensional plane-strain formulation with only edge dislocations. Single crystal films with a specified set of slip systems are considered. The film-substrate system…
Cobalt nanoparticles are incorporated into hexagonal honeycomb mesoporous silica to study the effect of nanoscale confinement on magnetic coupling. The superparamagnetic Co particles can fill a significant fraction of the total pore volume and can constitute up to 22.1 ± 0.9% by mass of the composite. We find that Co…
Magnetic phase diagrams of the hexagonal RMnO3 (with R=Sc, Y, Ho, In, Er, Tm, Yb, Lu) compounds in the magnetic-field/temperature plane are established by linear and nonlinear magneto-optical techniques. Eight different magnetic phases of the Mn3+ sublattice and at least three different phases of the R3+ sublattices a…
We study the temperature dependence of the magnetic anisotropy of three different martensites known to exist in the Ni–Mn–Ga alloys. The anisotropy constants were determined from magnetization curves measured at different temperatures. The anisotropy of five-layered modulated tetragonal martensite is uniaxial with eas…
We report a study of the magnetic properties of transition-metal doped Zn1−xTMxO (TM=Mn, Co, Fe). Polycrystalline powder samples were synthesized by both solid-state and liquid-phase reactions. From the Curie–Weiss behavior of susceptibility at high temperatures, it was found that the TM–TM interaction is dominated by…
We have investigated the microstructure and the magnetic properties of cobalt substituted ZnO thin films deposited on sapphire (0001) substrates by pulsed laser deposition. We have optimized the growth condition using in situ monitoring by reflection high-energy electron diffraction. We found that ferromagnetic films…
The hydrodynamic effect on the phase separation dynamics of chemically reacting binary mixtures is investigated based on the extended model H. Our simulation results reveal that many interesting patterns are obtained under different chemical reaction rates due to the coupling of hydrodynamics and chemical reaction. Fo…
A series of amorphous phosphates of Ce1-xTixP2O7 has been developed as a band gap tunable inorganic material. The optical absorption edge can be tuned through the desired range in the ultraviolet region by simple composition adjustments. This amorphous material consists of harmless elements and is a promising safety s…
Nanocrystalline yttrium vanadate doped with trivalent europium ions, YVO4:Eu3+, was synthesized via the microemulsion mediated hydrothermal process. Laser selective excitation spectra were employed to probe the local environments of Eu3+ ions in YVO4 nanocrystals. The local environments of the dopant ions were diversi…
Recent studies have pointed out the importance of the basal friction on the dynamics of granular flows. We present experimental results on the influence of the roughness of the inclined plane on the dynamics of a monodisperse dry granular flow. We found experimentally that it exists a maximum of the friction for a giv…
It has been shown that the KJMA (Kolmogorov-Johnson-Mehl-Avrami) solution of phase transition kinetics can be set as a problem of correlated nucleation [Phys.Rev.B65, 172301 (2002)]. In this paper the equivalence between the standard solution and the approach that makes use of the actual nucleation rate, i.e. that tak…
We report on the synthesis of high-quality Co-doped ZnO thin films using the pulsed laser deposition technique on (0001)-Al2O3 substrates performed in an oxidizing atmosphere, using Zn and Co metallic targets. We first optimized the growth of ZnO in order to obtain the less strained film. Highly crystallized Co:ZnO th…
The entropy change ΔS between the high-temperature cubic phase and the low-temperature tetragonally based martensitic phase of Ni2+xMn1−xGa (x=0–0.20) alloys was studied. The experimental results obtained indicate that ΔS in the Ni2+xMn1−xGa alloys increases with the Ni excess x. The increase of ΔS is presumably accou…
We report on the preparation and characterization of epitaxial thin films of the double-perovskite Sr2CrWO6 by pulsed laser deposition. On substrates with low lattice mismatch like SrTiO3, epitaxial Sr2CrWO6 films with high crystalline quality can be grown in a molecular layer-by-layer growth mode. Due to the similar…
We have studied magnetic properties of a diluted system of ultrafine cobalt ferrite nanoparticles (d∼3.3 nm). From the peak of the zero-field-cooled measurements, we obtained the blocking temperature TB of about 90.5 K and it is virtually independent of the applied magnetic field up to 5 kOe. At the superparamagnetic…
Bacterial cellulose (BC) gels produced by Acetobacter xylinum were used as model substrates for studying xylan assembly. The assembly of xylan onto BC surfaces was carried out by exposing BC films to xylan solutions under autoclave treatments. The BC surfaces were found to retain significantly higher amounts of xylan…
A method to implement the many-body Green function formalism in the GW approximation for infinite non periodic systems is presented. It is suitable to treat systems of known ``asymptotic'' properties which enter as boundary conditions, while the effects of the lower symmetry are restricted to regions of finite volume.…
We have investigated the charge carrier transport in organic molecular semiconductors. It has been found that mobility is a function of electric field and temperature due to hopping conduction. Several theoretical models for charge transport in disordered solids have been debated over the role of spatial and energetic…
Cu-doped type-I germanium clathrate can exhibit dilute magnetism, including ferromagnetism, antiferromagnetism, and metamagnetic transitions up to 90 K. 63Cu NMR measurements confirm that these transitions are due to a dilute composition of magnetic defects coupled by conduction electrons, behavior similar to that of…
We consider the electronic and magnetic properties of nanographite ribbon with zigzag edges under the periodic or Moebius boundary conditions. The zigzag nano-graphite ribbons possess edge localized states at the Fermi level which cause a ferrimagnetic spin polarization localized at the edge sites even in the very wea…