Materials Literature
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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…
Our objective in this study is to develop models which relate detailed structural parameters to performance, providing the means for predicting final film properties. In this work, we used different types of polyethylene (LLDPE, HDPE, and LDPE) at different process conditions in the film blowing process. The morpholog…
The dynamic magnetoelastic properties of a [112]-oriented magnetostrictive composite comprising 0.49 volume fraction of needle-shaped, [112]-oriented Terfenol-D particles and Spurr epoxy were investigated as a function of magnetic bias field. These properties included elastic moduli (E/sub 3//sup H/ and E/sub 3//sup B…
The efficiency of the transmission of surface plasmon waves by use of a dielectric diffraction grating is discussed. The Kretschmann device allows us to obtain a surface plasmon resonance that consists of an absorption peak in the reflection spectrum. When surface plasmon resonance occurs, the TM-polarization mode of…
New data on the specific heat, thermal expansion, and magnetization of the CaMn7O12 phase require a revision of the current concepts of the sequence of phase transitions in this compound. It is found that a spin-glass phase transition occurs in CaMn7O12 at T M = 49 K, whereas the transition at T S = 89 K exhibits the…
The phases and magnetic properties of Co-Zr-C melt-spun ribbon were studied. The Co/sub 80/Zr/sub 20/ melt-spun ribbon consisted of a metastable Co/sub 5/Zr phase together with fcc-Co and Co/sub 23/Zr/sub 6/ phases and showed a high coercivity. The small substitution of C for Zr in the Co-Zr melt-spun ribbon resulted…