Materials Literature
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Abstract Highly luminescent CdSe/ZnS nanocrystals were obtained by adapting non‐TOP‐based synthesis and a subsequent two‐phase ZnS shelling procedure: the core CdSe nanocrystals were synthesized in sole solvent paraffin liquid with cadmium oxide, elemental selenium, and oleic acid; the deposition of the ZnS shell was…
Abstract Nanostructured Bi 2 Se 3 and Sn 0.5 ‐Bi 2 Se 3 were successfully synthesized by hydrothermal coreduction from SnCl 2 ·H 2 O and the oxides of Bi and Se. The products were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), and field emission scanning electron microscope (FESEM).…
In this study, the pyroelectric coefficient and the figure of merit (FOM) of the ferroelectric (FE) PbZr0.3Ti0.7O3 (PZT 30/70) thin films were found to be greatly enhanced by introducing a thin antiferroelectric (AF) PbZr0.95Ti0.05O3 (PZT 95/05) layer underneath the FE film and thus creating a bilayer structure on pla…
The effect of thermal treatment on physical properties of (Ba0.6,Sr0.4)TiO3 (BST60) ferroelectric thick films deposited by aerosol deposition (AD) technique has been investigated by x-ray photoelectron spectroscopy (XPS) and complex impedance spectroscopy (CIS) to explain the leakage current behavior of the films. The…
In pursuit of thin film ferroelectric materials for frequency agile applications that are both easily adapted to large area deposition and also high performance, an investigation has been carried out into sol-gel deposition of 3% Mn doped (Pb0.4Sr0.6)TiO3. Large area capability has been demonstrated by growth of films…
We report the temperature dependence of the thermal conductivity κ(T) of bulk polycrystalline composite samples containing a magnetoresistive manganite (La0.7Ca0.3MnO3) and an electrically insulating phase (Mn3O4). The sample porosity is shown to be a significant parameter affecting the experimental data: after porosi…
We demonstrated the conversion of near-ultraviolet radiation of 250–350 nm into visible emission of 450–600 nm and near-infrared emission of 970–1100 nm in the Yb2O3 doped transparent 40SrO-20TiO2-40SiO2 glasses. The observed broad visible emission band centered at 510 nm is associated with silicon-oxygen-related defe…
The influence of A-site size and disorder on metamagnetic transformation in polycrystalline Pr0.5−xLaxCa0.5MnO3 and Pr0.5Ca0.5−xBaxMnO3 at low temperature has been systematically investigated. The introduction of larger A-site cations such as La3+ or Ba2+ will locally suppress the lattice distortion. This “counterdist…
The present paper relates to a method for synthesizing the photostimulable storage phosphor BaFBr:Eu2+ that features high stimulation characteristics for use in image plates. All previous synthesis routes consist of a multistep process whereas the presented route is a one-step synthesis. Starting compounds are BaCO3,…
We investigate the single-mode phonon transmission in symmetry-broken carbon nanotubes with the Stone-Wales defect using a mode-matching method. To gain an insight into the features of the transmission, the symmetry properties of phonons are analyzed within the line group symmetry theory for single-walled carbon nanot…
x BiCoO 3 – ( 1 − x ) BiFeO 3 films were deposited by metalorganic chemical vapor deposition. Although the film composition changed with deposition temperature, the composition could be adjusted by varying the input source gas composition at 700 °C. Moreover, adjusting the deposition time could change 0.16BiCoO3–0.84B…
A forward second-harmonic scattering method for determining the second-order susceptibility coefficients of ZnO nanorods on the order of 100 nm in diameter is presented. The long coherence length and strong intensity of the forward second-harmonic signal allow for a simple theoretical model to match the experimental m…
Iron nanoparticles embedded in MgO crystals were synthesized by Fe+ ion implantation at an energy of 100 keV and varying fluences from 3×1016 to 3×1017 cm−2. Investigations of structural and magnetic properties of Fe nanoparticles have been performed using magnetometry, x-ray diffraction, transmission electron microsc…
High density of crystal defects is formed in Si layers during their growth on the nanostructured surface composed of dense arrays of Ge islands grown on oxidized Si substrates. Although these defect-rich Si layers exhibit intense photoluminescence only at low temperatures, the forward-biased diodes with the Si layers…
The relaxation time approximation was used to interpret Hall effect data from n-type ZnO bulk samples grown using the high-pressure melt, seeded-chemical-vapor transport, and hydrothermal techniques. These samples represent a range of free-carrier concentrations due to different amounts of donors and compensating acce…
The Landau free energy expression for a ferroelectric thin film studied by Tilley and Zeks [Solid State Commun. 49, 823 (1984)] (Tilley–Zeks model) and the Landau–Khalatnikov dynamic equation are used to study the surface effects (represented by the extrapolation length ±δ) on properties of polarization reversal, name…
The crystal structure of the sol-gel derived pyrochlore Bi2Ti2O7 has been refined by a Rietveld analysis method using both neutron scattering and x-ray diffraction data. The sample contains a majority Bi2Ti2O7 phase and minor Bi4Ti3O12, Bi12TiO20, and TiO2 phases. A total goodness of fit from neutron and x-ray scatter…
We have investigated effects of the postmetallization annealing and the electric field application on ferroelectric properties of BiFeO3 thin films prepared by chemical solution deposition. The leakage current is reduced after the postmetallization annealing although the crystallinity of the polycrystalline BiFeO3 is…
Abstract Ce 3+ ‐doped Mn‐Zn ferrite fibers were successfully prepared by the organic gel‐thermal decomposition method from metal salts and citric acid. The composition, structure, and magnetic properties of these ferrite fibers were characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), and vibr…
Abstract Multiwalled carbon nanotubes (MWNTs) were treated with the reflux within the concentrated nitric acid for 0–25 h to purify and disperse the tangled MWNTs. The effect of reflux time on the morphology and the weight loss of MWNTs were investigated. Meanwhile, the dispersion of MWNTs with 0–2.0 wt.% in 2024Al po…