Materials Literature
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Complex permittivity, permeability, and electromagnetic wave absorption properties of resin compacts containing 50 vol% composite powders of /spl alpha/-Fe/Y/sub 2/O/sub 3/, FeCo/Y/sub 2/O/sub 3/, and /spl alpha/-Fe/Fe/sub 3/B/Y/sub 2/O/sub 3/ were investigated in this study. Real part (/spl epsiv//sub r/') and imagin…
The NMR structure of the conserved hypothetical protein TM0487 from Thermotoga maritima represents an alpha/beta-topology formed by the regular secondary structures alpha1-beta1-beta2-alpha2-beta3-beta4-alpha3- beta5-3(10)-alpha4, with a small anti-parallel beta-sheet of beta-strands 1 and 2, and a mixed parallel/anti…
Polycrystalline perovskites compounds HoMn/sub 1-x/Co/sub x/O/sub 3/ (x=0--0.8) have been prepared by conventional solid-state reaction. Here, we used far-infrared (FIR) spectroscopy to study infrared active phonon modes and present a comparative analysis of infrared transmission spectra of polycrystalline HoMn/sub 1-…
Rapid thermal crystallization of silicon films with a heating layer of diamond-like carbon (DLC) films is reported. DLC films 200 nm thick have an optical absorbance higher that 0.7 for wavelengths shorter than 1000 nm. They are also heat resistant to about 5000 K. A crystalline volume ratio of 0.85 is achieved for si…
The crystal structure of NaMgF 3 perovskite (neighborite) has been studied at 4 GPa and temperatures up to 1000 °C using the Rietveld structure-refinement method. In situ synchrotron X-ray powder diffraction data was collected using monochromatic radiation. The orthorhombic (Pbnm) to cubic (Pm3̅ m) transition was obse…
The weak viscous oscillations of a bubble are examined, in response to an elongation that perturbs the initial spherical shape at equilibrium. The flow field in the surrounding liquid is split in a rotational and an irrotational part. The latter satisfies the Laplacian and can be obtained via an integral equation. A h…
Complex system ceramics Pb(Sc(1/2)Nb(1/2))O3-Pb(Mg(1/3)Nb(2/3))O3-Pb(Ni(1/2)Nb(1/2))O3-(Pb0.965,Sr0.035) (Zr,Ti)O3 (PSN-PMN-PNN-PSZT abbreviated PSMNZT) have been synthesized by the conventional technique, and dielectric and piezoelectric properties of the ceramics have been investigated for ultrasonic medical transdu…
Production methods for obtaining the metastable LaFe/sub 12/O/sub 19/ are described. The magnetic properties of La-substituted Sr hexaferrite and pure LaFe/sub 12/O/sub 19/ are summarized. The uniaxial anisotropy of LaFe/sub 12/O/sub 19/ increases dramatically with decreasing temperature. This is attributed to a chang…
Applying a nonlinear spectroscopic technique, we accurately monitor the dynamics of the homogeneous upconversion (HUC) in Er-doped fibers. We provide the first experimental confirmation, to our knowledge, of the earlier theoretical predictions that, for low erbium concentrations, a decay of HUC-influenced excitation p…
A recently developed computer package for a fully relativistic first-principles many-electron method based on a numerical solution of the Dirac equation is consistently applied to the calculations of the 4 f n energy level scheme of trivalent rare-earth ions in a free state. The overestimation of the energy levels obt…
Abstract When toluene solutions of the tetrametallic compound, [Al{μ‐OEt) 2 AlMe 2 } 3 ] ( 1 ), are stirred in air at room temperature, pure amorphous nanoparticulate Al 2 O 3 precipitates. The average particle size is 17.7 ± 7.4 nm. The tetrametallic core of 1 , having the correct stoichiometry for alumina (2Al 2 O 3…
Abstract Ligand exchange reactions of [NMe 4 ]SeCF 3 or [Cs(15‐Crown‐5) 2 ]SeCF 3 with Ag[BF 4 ] and AuCl gave the corresponding bis(trifluoromethylselenato(0))metallates [Ag(SeCF 3 ) 2 ] ‐ and [Au(SeCF 3 ) 2 ] ‐ in good yields. All compounds were characterized by NMR spectroscopic means and ESI mass spectrometry. Cat…
We present structures of PbHfO 3 between 100 and 525 K analyzed by a Rietveld method using synchrotron radiation. Spontaneous strain of a perovskite sublattice could be excellently expressed by a conventional phenomenological theory in a room-temperature antiferroelectric phase. Pb shifts along the a -axis and the squ…
YMn/sub 2/O/sub 5/ compounds have been important for industrial applications due to their unique nature of ferroism. In this study, two YMn/sub 2/O/sub 5/ samples with different phases are prepared, one is orthorhombic (OT) and the other is hexagonal (HX) in structure, for investigating the structure dependency of mag…
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Quantum chemical parameters were calculated for inhibitor compounds like substituted pyridines, anilines, guanides, azoles, oxadiazoles, diols, and diamines. The degree of corrosion inhibition has been correlated with the energy of the highest occupied molecular orbital (EHOMO), ELUMO–EHOMO, the degree of softness of…
Detailed analysis of the commensurability oscillation (CO) has been performed on unidirectional lateral superlattices with periods ranging from a=92 to 184 nm. Fourier analysis reveals the second (and the third) harmonics along with the fundamental oscillation for a>=138 nm (184 nm) at low-enough temperature, evincing…
Undoped, Mn-doped, Pr-doped, and Mn- and Pr-codoped ZnS nanoparticles were synthesized by a wet chemical method, and these nanoparticles were optically annealed in air or vacuum. In the photoluminescence (PL) spectra of the optically annealed nanoparticles, a sulfur–vacancy-related PL band at around 420 nm, a PL band…
Multilayers thin films consisted of TiO 2 nanoparticles and oppositely charged polyelectrolytes were fabricated by layer-by-layer self-assembly method and their properties were characterized. At pH 2.0, TiO 2 nanoparticles were maximally deposited with poly(sodium 4-styrenesulfonate) (PSS) and the thickness and the su…
This work presents the first systematic determination of the partial molar volumes of lanthanide sesquioxides in silicate melts. For this purpose, the densities of various lanthanide-bearing Na-silicate melts distributed along various binary joins, where the end-members are Na-disilicate and one of the lanthanide sesq…