Materials Literature
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The growth of low dielectric constant (k) Boron Nitride (BN) film on silicon as wel1 as methylsilsesquioxane-based nanoporous films (LKD-5109) using plasma-discharged borazine was investigated. BN films were grown using microwave plasma (2.45GHz) or radio-frequency (rf) atom beam deposition (13.56MHz) on LKD-5109 in o…
Abstract A series of fluorinated polyamideimides (PAIs) were synthesized by the direct polycondensation of a novel diimide‐diacid, 1,4‐bis(trimellitimido‐2‐trifluoromethylphenoxy) benzene (BTTFB), with aromatic diamines by using triphenyl phosphite (TPP) and pyridine as condensation agents in a medium consisting of N…
The crystalline structures of the ternary halides M2BaX4 (M=Cs, Rb; X=Br, Cl), and their luminescence when doped with Eu2+ ions, are reported. These compounds crystallize with the Th3P4 body-centered cubic structure, where the Rb or Cs and Ba cations randomly occupy the Th sites in a 2:1 ratio. The Cs2BaCl4 and Rb2BaC…
The development of nanophosphors of desired sizes and properties for various practical applications and its growth in quantitative amounts inside the pores of an inorganic matrix is presented. By doing so, nanophosphors get surface passivated and are stabilized against environmental attacks. Accordingly, in the presen…
Electrical transport properties of carbon nanotubes can be dramatically changed by mechanical deformations that alter tube shape and the corresponding positions of the atoms comprising the tube wall. In principle, detailed atomic/electronic calculations can provide both the deformed configuration and the resulting ele…
Use of multilayer dielectric thin films provides opportunities to optimize properties for different applications. In this work, the changes in the leakage current in Ba0.8Sr0.2TiO3 thin films upon introduction of ZrO2 layers of different thicknesses are studied. Unusual changes in the leakage current and the transitio…
The characterization of iron thin films grown at different substrate temperatures has been performed by x-ray diffraction (XRD) and extended x-ray absorption fine structure (EXAFS). The film growing of iron at low temperatures provides an excellent system to test the results obtained from both techniques because the c…
Abstract Sodium acrylate was grafted onto cornstarch by microwave irradiation to synthesize a superabsorbent, in which potassium persulfate (PPS) was used as the initiator and polyethyleneglycol diacrylate as the crosslinker. It was found that microwave irradiation could substantially accelerate the synthesis, without…
In this investigation, (1−x)(Bi0.9La0.1)(Ga0.05Fe0.95)O3-x(Pb0.9Ba0.1)TiO3(BLGF-PBT) crystalline solutions have been fabricated by using the solid-state reaction method. A ferroelectric rhombohedral/tetragonal morphotropic phase boundary (MPB) of (1−x)BLGF-xPBT was observed for x=0.4. In the vicinity of MPB, 0.6BLGF-0…
We have investigated the origin of the huge magnetocaloric effect in a manganite system with ferro–antiferromagnetic phase mixture at low temperatures. We carried out magnetic measurements in fields up to 100 kOe in order to show that both a high hysteretic behavior and a metamagnetic transition in the antiferromagnet…
Magnetoelectric composites were created through incorporating dispersed CoFe2O4 ferromagnetic grains into a Sr0.5Ba0.5Nb2O6 relaxor ferroelectric matrix. The two phases are chemically compatible and coexist in the dense, sintered composites. Unlike other relaxors, the Sr0.5Ba0.5Nb2O6-containing composites can be elect…
Epitaxial Pb(Zr0.52Ti0.48)O3 (PZT) thin-film capacitors with La0.7Sr0.3MnO3 (LSMO) electrodes have been grown on (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7 (001) substrates by pulsed-laser deposition. The process-induced imprint behavior in the ferroelectric capacitors was examined by in situ and ex situ annealing at various cond…
The effects of B2O3 vapor doping on the dielectric properties of barium titanate ceramics were studied. After the doping, the Curie point of BaTiO3 ceramics was increased from 128 °C to 130 °C and the maximum dielectric constant was considerably increased. X-ray diffraction showed that both the grain lattice parameter…
We present a Raman spectroscopy study of the lattice-dynamical properties of the BaxSr1−xTiO3 thin films with x=0.05, 0.1, 0.2, 0.35, and 0.5 in the temperature range of 5–300K. Soft phonon modes were observed, and the temperature dependence of their frequencies and Raman intensities were investigated. The Raman spect…
Molecular-dynamics simulations of hydrocarbon beam injections into a poly (1,4-phenylene) substrate surface are carried out with the use of classical potential functions for covalent bonds of carbon and hydrogen atoms. Van der Waals interactions among carbon atoms are also taken into account. In the low injection ener…
The structural and electronic properties of La2Zr2O7 and La2Hf2O7 pyrochlore compounds were investigated using the first principles full-potential linearized augmented plane wave method within the density functional theory. In this approach, the generalized gradient approximation was used for the exchange-correlation…
The reduction of Cu2O islands grown on Cu(100) surfaces through vacuum annealing was visualized by an in situ ultrahigh vacuum transmission electron microscope. The shrinkage of the island followed a linear decay behavior. The complete reduction of the oxide islands leads to the formation of nanoindentations on the Cu…
Abstract Summary: The isolation and structural characterization of a methylaluminium(bisphenoxide)‐ ε ‐caprolactone complex is reported. While the three‐coordinate methylaluminium complex was found not to catalyze the polymerization of ε ‐caprolactone, its oxygenation led to the formation of an aluminium methoxide com…
Abstract The effects of chemical structure and synthesis method on the photodegradation behavior of polypropylene (PP) were investigated in injection‐molded samples exposed to ultraviolet radiation (UV) at 60°C. For this purpose, three PP samples with different chemical structures were chosen: two homopolymerized PP s…
The structural, magnetic, and transport properties are investigated for full-Heusler alloy Co2(Cr1−xFex)Al (CCFA) thin films sputtered on thermally oxidized Si substrates at room temperature (RT). X-ray diffraction reveals that the films possess the B2 structure for x=0, decrease the atomic site ordering by substituti…