Materials Literature
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Mn was doped into TiO2 to clarify the real effects of Mn doping on magnetic and structural properties of TiO2 thin films. Mn doping does not play any key role in introducing ferromagnetism (FM) in the system. When the dopant concentration is small (below 5%), the Mn atoms can still be substituted for Ti atoms and main…
We report on the studies of the influence of hydrostatic pressure (up to 1.2 GPa) on dynamic electronic structure phenomena in 3d transition metal coordination compounds by Mössbauer and magnetic susceptibility measurements. We present examples of mononuclear spin crossover compounds of iron(II) and chromium(II), dinu…
The photoluminescence properties of nitrogen-incorporated SnO2 thin films on Si (100) substrates deposited by reactive magnetron sputtering have been studied. A strong photoluminescence band centered at 3.696eV with full width at half maximum of 0.2eV has been observed at room temperature. The peak position of the emi…
We have examined the magnetoresistances of (La,Pr,Ca)MnO3 channel structures with different channel widths. The 500nm channel showed an extremely sharp metallic transition from charge ordered insulator to ferromagnetic metal at low temperature, while the 10 and 1μm channels showed gradual metallic transitions. The sha…
A detailed Rietveld analysis of x-ray data, collected at room temperature, was done on ceramics with controlled grain size between 100nm and 4μm for (PbMg1∕3Nb2∕3O3)0.80–(PbTiO3)0.20 (PMN-PT20), i.e., a compound at the border of the so-called morphotropic phase boundary. With size reduction the polarization rotates wi…
Room-temperature photoluminescence has been studied in n-type bulk ZnO crystals representing three different growth methods and having free-carrier concentrations (n) ranging from 1013to1018cm−3. The near-band-edge emission has both free-exciton and free-exciton-phonon contributions, with the strength of the phonon co…
We have simulated the structure of amorphous zircon using classical molecular dynamics simulations with a partial-charge model. We present detailed structural characterizations of the simulated high and low density amorphous zircon, and compare our results with available neutron diffraction, EXAFS, NMR and other exper…
The reaction of the nitro-substituted triplesalen ligand <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mtext>H</mml:mtext> <mml:mn>6</mml:mn> </mml:msub> <mml:msup> <mml:mrow> <mml:mtext>talen</mml:mtext> </mml:mrow> <mml:mrow> <mml:msub> <mml:mrow> <mml:mtext>N…
The effects of europium (Eu) content on the microstructure, fatigue endurance, leakage current density, and remnant polarization (2Pr) of Bi4−xEuxTi3O12 (BET) thin films prepared by metal-organic decomposition method at 700°C annealing temperature were studied in detail. The results showed that 2Pr (82μC∕cm2 under 300…
The crystal structures of glaukosphaerite (Cu,Ni)2(CO3)(OH)2 and pokrovskite Mg2(CO3)(OH)2, two carbonates belonging to the malachite-rosasite group, have been determined from powder diffraction data, and refined up to wRp = 3.94% and 1.63% respectively. Both minerals are isostructural with rosasite (Cu,Zn)2 (CO3)(OH)…
Abstract Precipitation of the polymorphic compound L‐glutamic acid was initiated by premixing aqueous solutions of sodium L‐glutamate and sulfuric acid. Samples of the supersaturated solution were either subjected to vigorous post‐stirring or left under quiescent conditions. For low supersaturation (S ≤ 13) without po…
Magnetic properties of manganese(III) tetra(ortho-fluorophenyl)porphyrin-tetracyanoethylene were studied by ac and dc measurements on polycrystalline samples. This compound consists of ferrimagnetic chains, in which magnetic moments of Mn ion $(S=2)$ in the center of a porphyrin disc and of a tetracyanoethylene radica…
The authors demonstrate the ability of multiwall carbon nanotubes to generate photocurrents in the near ultraviolet and visible spectral ranges using electrochemical photocurrent measurements. The photogenerated current depends on the excitation wavelength similar to that for single wall carbon nanotubes. Its intensit…
Abstract Flexible polyurethane foam scrap was chemically decomposed via glycolysis. Optimal reaction conditions for glycolysis were determined: temperature, 220°C, polyurethane/glycol ratio, 1:1; reaction time, 2.5 hr; diethylene glycol or dipropylene glycol as reagents. Two types of polyurethane scrap were tested; bo…
The authors report a simple method to significantly enhance the photoluminescence (PL) of SiNx films by incorporating a SiO2 buffer and annealing treatment under N2 protection. Strong visible PL is achieved with annealing temperature above 650°C. Optimal PL is obtained at 800°C. The composition and structure analysis…
Gold nanocrystals of different shapes have been made by a wet chemical approach based on a two-step, seed-mediated synthesis. In this paper, we demonstrate a one-step synthetic method for achieving simple and systematic control over the shape of gold nanoparticles. Gold nanowires, which have been prepared by multi-ste…
Photoluminescence (PL) dynamics in single-walled carbon nanotubes (SWNTs) has been studied by the femtosecond excitation correlation method with a 150 fs time resolution. The SWNT samples were synthesized by different methods and suspended in gelatin films or D2O solutions. The PL dynamics of SWNTs depends on the loca…
Abstract A temperature‐sensitive polymer, poly(N‐isopropylacrylamide) [poly(NIPAM)], was tested to flocculate kaolinite clay suspensions. Settling tests at both room temperature and 40°C were carried out. The results show that settling at 40°C resulted in significantly higher settling rates and smaller sediment volume…
We assess two newly developed exchange-correlation functionals on four bulk phases of zinc oxide (ZnO) and compare results with conventional local density and the Perdew-Burke-Ernzerhof realization of the generalized gradient approximation (GGA). The two functionals assessed are the Tao-Perdew-Staroverov-Scuseria, a n…
Abstract Effective electric permittivity and magnetic permeability for metamaterial structures are extracted from 3D field simulation data. The equivalent representation of the metamaterial is a homogeneous slab described with parameterized dispersive Drude and Lorentz models. The parameters of dispersive models are o…