Materials Literature
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Introduction With elastic deformation, the strains are proportional to the stress, so every level of stress causes some elastic deformation. On the other hand, a definite level of stress must be applied before any plastic deformation occurs. As the stress is further increased, the amount of deformation increases, but…
Abstract A reduction of the size and weight of connecting rods can be obtained using the deposition of bearing materials by thermal spraying directly on the substrate. For this application several thermal spray processes are coming in competition. However the aspect of the metallurgical reactions during the coating de…
Abstract In this paper, the modified method of plasma spraying using liquid suspension feedstock was used to elaborate thin titanium dioxide coatings. TiO2 Degussa P25 powder were dispersed by continuous stirring in distilled water and alcoholic solutions and injected in an Ar-H2 or Ar-H2-He plasma plume under atmosph…
Abstract Sr 2 FeMoO 6 and Sr 2 CoMoO 6 were studied by use of density functional theory. For tetragonal and cubic Sr 2 FeMoO 6 , band structure and density of states show a slightly different pattern. Both crystal systems are ferrimagnetic and half‐metallic, in agreement with previous theoretical studies by diverse me…
Co 2 MnSi thin films were grown on Al2O3 (a plane) and GaAs (001) substrates and on thin silicon nitride windows using pulsed laser deposition. Angle-dependent magneto-optic Kerr effect measurements reveal both a uniaxial and a fourfold magnetocrystalline anisotropy for films grown on GaAs (001). X-ray magnetic circul…
Fe 3 O 4 ∕ Ga As hybrid structures have been studied using reflection high-energy electron diffraction (RHEED), x-ray photoelectron spectroscopy (XPS), x-ray magnetic circular dichroism (XMCD), and low-temperature vibrating-sample magnetometry (VSM). The samples were prepared by oxidizing epitaxial Fe thin films in a…
Both polycrystalline Co2CrAl and epitaxial Co2FeAl full Heusler alloy thin films with the perfectly ordered L21 structure have been grown onto GaAs(001) substrates at 673 K. The Co2FeAl films, in particular, consist of an almost single phase with the crystalline relationship ofCo2FeAl(001)⟨110⟩‖GaAs(001)⟨110⟩. The ele…
Electron-beam deposited Ni∕Au is found to produce ohmic contacts to p-type ZnMgO (p∼1016cm−3) after annealing in the range 300–450°C. A minimum specific contact resistance of ∼10−2Ωcm2 at room temperature and of 4×10−5Ωcm2 at 473K from circular transmission line measurements was obtained after annealing at 350°C for 1…
We performed temperature and field-dependent reversible transverse susceptibility (TS) measurements on a La0.85Sr0.15MnO3 single crystal at radio frequency (10MHz) using a resonant tunnel-diode oscillator technique. These dynamic experiments probe the coupled electronic, magnetic and structural transition in LSMO givi…
The possibility of an electrically programmable photonic crystal is investigated theoretically based on the metal-insulator transition of vanadium dioxide (VO2). Recent experiments indicate that this phase transition of the first order can be controlled via external bias and results in significant changes in the elect…
The optical (absorption of light and magnetotransmission of IR radiation), magnetic, and transport properties of the epitaxial La0.67Sr0.33MnO3 films of different thickness grown by laser ablation on the (100) SrTiO3 and LaAlO3 substrates were investigated. The effect of magnetotransmission reaches 6% at the temperatu…
Cr O 2 is an important transition metal oxide due to its half-metallic behavior. We have performed ultrafast laser pump-probe differential transmission experiments on epitaxial CrO2(110). Polarizations parallel and perpendicular to the c axis were used, at wavelengths corresponding to important magnetic excitations: 1…
The effect of oxygen annealing on the structural and transport properties of La0.7Ca0.3MnO3 thin films deposited on SrTiO3 substrates has been investigated by x-ray diffraction analysis and resistive measurements. The as-grown films are fully tensile strained on the substrates and show a depressed metal-insulator tran…
We have fabricated the epitaxial thin films of La1−xSrxMn1−yRuyO3 (x=0.4, y=0, 0.05, and 0.1) with an atomically flat surface by a pulsed-laser deposition method. The Ru doping enhances the coercive field from 40Oe (y=0) to 300Oe (y=0.05) and 600Oe (y=0.1) at 5K. The moderate Ru doping (y=0.05) even increases the ferr…
Besides the Kondo effect observed in dilute magnetic alloys, the Cr-doped perovskite manganate compounds La0.7Ca0.3Mn1−xCrxO3 also exhibit Kondo effect and spin-glass freezing in a certain composition range. An extensive investigation for the La0.7Ca0.3Mn1−xCrxO3 (x=0.01, 0.05, 0.10, 0.3, 0.6, and 1.0) system on the m…
This article is aimed at studying the temperature dependence oxygen nonstoichiometry, magnetic moments, Fe3+ fraction, Néel temperature and conductivity of (La,Sr)FeO3−δ. It is found that the magnetic properties in La0.60Sr0.40FeO3−δ is determined by Fe3+ and its concentration, and the conductance is resulted from Fe4…
Two dielectric relaxation loss peaks associated with oxygen-ion diffusion in the intergrowth Bi2WO6–Bi3TiNbO9(Bi5TiNbWO15) bismuth layered ferroelectrics were observed. The activation energy and the relaxation time at infinite temperature, for these two peaks, were determined to be (0.89 eV, 1.3×10−13s) and (0.84 eV,…
We have investigated the structures, energetics, and electronic structures of XH3-radical-decorated silicon carbide nanotubes (SiCNTs), where X={C,Si}, using density-functional theory. Our results show that all the XH3 radicals can be chemically adsorbed on Si sites or C sites on the tube wall, with the adsorption ene…
Recent studies reported that the theoretical predictions of the effective thermal conductivity of nanotube-based composites by conventional micromechanical models are anomalously higher than those measured experimentally and suggested that the contact resistance on the interface could be the contributing factor to the…
Memory effects in the electronic transport in CdSe nanocrystal (NC) quantum-dot arrays have been observed and characterized. Conduction through a NC array can be reduced with a negative voltage and then restored with a positive voltage. Light can also be used to restore or even increase the NC array conduction. We hav…