Materials Literature
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Abstract Effects of various Cr and B sources and preheating conditions on the high temperature synthesis of chromium orthoborate were studied. Precursors were mixed, ground, heated at 1000 °C and reground. The obtained products were checked by XRD, vibrational and electronic spectroscopy, SEM and density measurements.…
Abstract The tetracoordinate bis ‐o ‐iminobenzosemiquinonato cobalt and iron complexes, Co(ISQ‐Pr i ) 2 ( 1 ), Co(ISQ‐Me) 2 ( 2 ), Fe(ISQ‐Pr i ) 2 ( 3 ), Fe(ISQ‐Me) 2 ( 4 ), (ISQ‐Pr i is 4,6‐di‐ tert ‐butyl‐ N ‐(2,6‐di‐ iso ‐propylphenyl)‐ o ‐iminobenzosemiquinone and ISQ‐Me is 4,6‐di‐ tert ‐butyl‐ N ‐(2,6‐dimethylphe…
Thermal strain sensitivity of the dielectric property was investigated for (111)-textured polycrystalline Bi–Zn–Nb–O films. Cubic pyrochlore films with similar crystallinity and the degree of the orientation were obtained on various substrates, and their 111 lattice spacing monotonously increased with the increasing t…
By using density functional theory and the generalized gradient approximation, we show that Li-decorated cis-polyacetylene meets some of the requirements of an ideal hydrogen storage material. Unlike Ti-doped cis-polyacetylene, Li resists clustering and can reversibly store up to $10.8\text{ }\text{wt}\text{ }%$ hydro…
The aluminum solubility of acidified soils both from furrows and under tree canopies of a tea garden was studied using equilibrium experiments in 0.01 mol L−1 CaCl2 solution systems. The soils were originally classified as allophanic Andosols. The furrow soils were more severely acidified because of the heavy applicat…
Abstract The motivation for this study is the need for accurate numerical models of melt flow instabilities during Czochralski growth of oxides. Such instabilities can lead to undesirable spiralling shapes of the bulk crystals produced by the growing process. The oxide melts are characterized by Prandtl numbers in the…
By using a nonlinear model of surface morphological evolution, linear stability analysis, and self-consistent dynamical simulations, we analyze the effects of surface crystallographic orientation of a metallic thin film on its surface morphological response to the simultaneous action of an electric field and mechanica…
A soft reduction: The new layered oxoferrate(II) SrFeO2 (see scheme: Fe red, Sr yellow, C gray) was synthesized by the reduction of the slightly oxygen-deficient perovskite SrFeO3−x at 400 K with CaH2 in a form of topotactical reaction. The square-planar-coordinated iron(II) ions in SrFeO2 exhibit a high-spin d6 confi…
The effect of hydrostatic pressure (P) on the c-axis electrical resistivity (ρc) and ferromagnetic (FM) transition temperature (TC) of Sm0.52Sr0.48MnO3 single crystal has been investigated. At P=0, the strong hysteretic nature of metal-insulator transition (MIT) and the abrupt decrease of ρc by several orders just bel…
Abstract The new silver silicate Ag 4 SiO 4 has been obtained by solid state reactions starting from stoichiometric amounts of the binary oxides at elevated temperatures and oxygen pressures. Ag 4 SiO 4 crystallizes in space group P 4 2 / n (No. 86) with a = 7.3169(3), c = 4.9595(4) Å, V = 265.52(3) Å 3 , Z = 2; the s…
Photoinduced fluorescence enhancement (PFE) in colloidal CdSeTe∕ZnS core/shell quantum dots (QDs) was investigated by monitoring ensemble fluorescence and single-QD fluorescence blinking behavior upon illumination. Ensemble fluorescence was increased in air and in vacuum with different enhanced factors. At the single-…
Abstract Bis‐ o ‐iminobenzosemiquinonato zinc and cadmium complexes M(ISQ‐Pr i ) 2 (M = Zn, 1 ; M = Cd, 2 ) were found to be diradical complexes of a distorted tetrahedral geometry according to X‐band EPR spectroscopy. Tetrahedral structure of zinc complex 1 was confirmed by X‐ray diffraction analysis. The spectro‐ an…
This report concerns the magnetic properties of colloidal Ni nanoparticles (NPs) obtained by chemical reduction of Ni(II) salt in an organic solvent. The NPs present a complex and disordered atomic structure, where small clusters of a few Ni atoms appear to coexist within each NP. These NPs exhibit interesting magneti…
Theoretical and experimental studies on Seebeck effect in EuTe∕PbTe superlattices were performed. Theoretical calculations, which take into account temperature dependent band gap, nonparabolicity, and anisotropy of effective masses in the PbTe conduction band, were performed in the framework of Boltzmann equation in w…
Bi 1.5 Zn 1.0 Nb 1.5 O 7 ∕ Mn -doped Ba0.6Sr0.4TiO3 heterolayered thin films were deliberately deposited on Pt∕Ti∕SiO2∕Si substrate by pulsed laser deposition and used as tunable materials. The hetero-layered films exhibit prominently enhanced tunable performance compared to previous reported dielectric/ferroelectric…
We present predictions for the static scaling exponents and for the cross-over polymer volumetric fractions in the marginal and concentrated solution regimes. Corrections for finite chain length are made. Predictions are based on an analysis of correlated fluctuations in density and chain length, in a semigrand ensemb…
A systematic investigation on the effect of R doping, particularly the magnetic coupling between R and Fe, has been performed for the La1−xRxFe11.5Si1.5 intermetallics (R=Ce, Pr, and Nd). A magnetic interaction comparable to that between Fe atoms is found between the R and Fe atoms, which causes an enhancement of the…
The transport properties of field-effect transistors based on C60 fullerene peapods have been investigated and our findings indicate that the transport characteristics of single-walled carbon nanotubes (SWNTs) are highly sensitive to the encapsulated fullerenes due to the charge-transfer effect. Under light illuminati…
Abstract LnCuSe 2 compounds crystallize either in the monoclinic LaCuS 2 (space group P 2 1 / c ) or the trigonal CaLi 2 Si 2 (space group $P{\bar 3}m{\rm 1}$ ) type of structure. The first group is formed by the light rare‐earth elements (Ln = La, Ce, Pr, Nd, Sm, Gd and Tb), the second by the heavier rare‐earth eleme…
Fe, Cu co-doped In2O3 nanocrystals were synthesized by a coprecipitation method. Phase analyses revealed that Fe ions have high solubility (up to 15.4at.%) in the In2O3 matrix, while the Cu ions strongly restrain In2O3 phase transition from cubic to hexagonal. Raman spectroscopy shows that by adding Cu ions, the defec…