Materials Literature
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We have studied the structural, electronic, and ferroelectric properties of La2Ti2O7 (LTO) and Nd2Ti2O7 (NTO) by first-principles density functional theory calculations. The computed structural parameters are found to be in good agreement with experimental findings. In particular, the P21 phase is confirmed to be ener…
The absorption and luminescence spectra of the free-base forms of some new tetrarphenylporphyrin derivatives bearing a chelating group or lutetium chelate as a substituent on the phenyl ring were studied with reference to the properties of unsubstituted tetrarphenylporphyrin. The fluorescence and phosphorescence quant…
The innate leakage current mechanisms of epitaxial BiFeO 3 epitaxial thin films were investigated by current–voltage ( I – V ) measurements in a microscopic region by a scanning probe microscopy (SPM) using a conductive probe to exclude the effect of the microstructure of the films such as the conduction at the grain…
An 8 m thick Ga-doped ZnO (GZO) film grown by metal-source vapor phase epitaxy was deposited on a GaN-based light-emitting diode (LED) to substitute for the conventional ITO as a transparent conduct layer (TCL). Electroluminescence spectra exhibited that the intensity value of LED emission with a GZO TCL is markedly i…
This paper proposes a super-compact 0dB/3dB forward coupler composed of symmetrically installed two multi-layered (ML) composite right-/left-handed (CRLH) transmission lines (TLs). Each CRLH TL has double left-handed shunt-inductors to produce a large phase difference between even and odd modes, leading to significant…
Abstract Polyolefin elastomers based on ethylene, propylene, and isobutylene plus other monomers are now widely used in many diverse applications. Major research and development efforts have led to thermoplastic polyolefin soft automobile bumpers, modifiers for lubricating oils, and fast extrusion grades of ethylene–p…
This paper investigates the effect of atomic disorder on the electronic structure, magnetism, and half-metallicity of full-Heusler Co 2 FeSi alloy by using the full-potential linearized augmented plane wave method within the generalized gradient approximation (GGA) and GGA+U schemes. It considers three types of atomic…
The field-induced phase transition between the rhombohedral and tetragonal phases was investigated in Pb(Zn 1/3 Nb 2/3 )O 3 –8%PbTiO 3 by dielectric constant and electrostriction loop measurements. The temperature-electric-field phase diagram was clarified, and physical properties near the field-induced phase transiti…
The effect of an ac electric field on the conductance of a system of single-wall semiconductor-type carbon nanotubes placed in a dc electric field is considered. The strength vectors of dc and ac electric fields are directed along the nanotube axis. The electronic system of carbon nanotubes is considered in the contex…
In order to fabricate photovoltaic (PV) cells incorporating light-trapping electrodes, flexible foil substrates, or more than one junction, illumination through the top-contact (i.e.: non-substrate) side of a photovoltaic device is desirable. We investigate the relative collection efficiency for illumination through t…
Four π∗ resonance peaks were observed in the B-K near edge x-ray absorption fine structure spectra of boron nitride thin films prepared by magnetron sputtering. In the past, these peaks have been explained as the K-absorption of boron atoms, which are present in environment containing nitrogen vacancies, the number of…
The magnetic properties, electrical resistivity and related microstructures of (Nd,Pr) 14.5 Dy 1.2 Fe bal Al 0.8 B 6 magnets modified by DyN addition have been investigated. The coercivity of the magnets increases almost linearly as a function of DyN content without a considerable reduction in remanence. Similarly, th…
(K,Na)NbO 3 (KNN) films with very high transverse piezoelectric coefficient d 31 , which attained values comparable to those of Pb(Zr,Ti)O 3 (PZT) films for the first time, were successfully deposited on Pt/Ti/SiO 2 /Si φ 4-in. substrates by RF magnetron sputtering. These films were polycrystalline and had pseudo-cubi…
Abstract The origin of the plasticity in bulk nanocrystalline metals have, to date, been attributed to the grain‐boundary‐mediated process, stress‐induced grain coalescence, dislocation plasticity, and/or twinning. Here we report a different mechanism—detwinning, which operates at low temperatures during the tensile d…
INTRODUCTION: The cryopreserved homograft is a good valve substitute due attributes like excellent hemodynamics, low incidence of thromboembolic events, infection resistance and good mid-term durability. However, progressive homograft degeneration and fibrocalcification may occur, particularly in the childhood and you…
Uniform and nanosized phosphors of Sr 2 SiO 4 :Eu 2+ were successfully synthesized by a simple, inexpensive, and relatively low-temperature synthesis route using the combustion method. Through the chemical reaction of Sr(NO 3 ) 2 , Eu(NO 3 ) 3 , and fumed silica, the pure phase of nanosized Sr 2 SiO 4 :Eu 2+ was obtai…
Due to its good mechanical properties, the Compacted (Vermicular) graphite cast iron (CGI) has found a lot of applications in the automobilistic field. One of the applications is the production of high power diesel engine blocks that, due to the higher strength compared to the usual gray cast iron, allows the increase…
(Ca 0.1 Ba 0.9 )TiO 3 + x wt % MnCO 3 [ x =0, 0.2, 0.5, 1.0] (CBT-M x ) ceramics were prepared by conventional sintering, and their dielectric and piezoelectric properties were measured. The mechanical quality factor ( Q m ) of CBT was markedly enhanced by Mn addition and reached 2400 when x =0.5. The dielectric loss…
Undoped and Al and In doped ZnO films were deposited on flexible PET substrates by Reactive Pulsed Laser Deposition (R-PLD). The morphological and structural characteristics of the obtained structures were investigated by AFM, SEM and XRD respectively. The transmittance spectra were recorded in the 300–1200 nm wavelen…
Here, we report a straightforward synthesis process to produce colloidal Eu(3+)-activated nanophosphors (NPs) for use as bioimaging probes. In this procedure, poly(ethylene glycol) serves as a high-boiling point solvent allowing for nanoscale particle formation as well as a convenient medium for solvent exchange and s…