Materials Literature
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Composites with ferroelectric cubic inclusions are experimentally investigated with coaxial line technique in the microwave frequency range 1–18 GHz. The composites exhibit dispersive effective magnetic and dielectric properties. Strengthening of magnetic resonances with the increase in the inclusions’ number is obser…
Two additional vibration modes at 250 and 529 cm−1 were observed in hydrogenated Zn0.98Mn0.05O nanopowders. The number of oxygen vacancies was increased by hydrogenation, which induced the mode at 250 cm−1. The additional vibration mode at 529 cm−1 was due to the increase of the number of subsititutional Mn atoms occu…
Epitaxial ferroelectric PbZr0.2Ti0.8O3 thin films were grown by pulsed laser deposition. PbZr0.2Ti0.8O3 was doped with Cr acting as acceptor ion. Microstructural characterization was performed by (high resolution) transmission electron microscopy. The voltage dependence of polarization, dielectric constant, and leakag…
The structure and dielectric properties of Ba(Ti 0.91 Zr 0.09 )O 3 ceramics with CuO doped were investigated. XRD indicates that compositions have single tetragonal phase for x (CuO) ≤ 0.38wt% at room temperature and shows the increase in the distance of (110) lattice plane. A decrease in grain size is observed when t…
Understanding the physical behavior of an interface between two different oxides is made difficult because of the many competing physical mechanisms such as epitaxial strain, broken symmetry, elemental interdiffusion, and polarity discontinuity, which may be at play simultaneously. We propose an approach, based on het…
The single or multienergy nitrogen (N) ion implantation (MENII) processes with a dose (4×1014 ions/cm2) just below the critical dose (1×1015 ions/cm2) for the structural transformation of ultrananocrystalline diamond (UNCD) films were observed to significantly improve the electron field emission (EFE) properties. The…
AC impedance spectroscopic study was carried out to understand the effect of defects on microstructure and electrical properties of lead-free material system of (Bi 0.5 (Na 0.82 − x K 0.18 Li x ) 0.5 )TiO 3 ceramics with x = 0, 0.05, 0.075 and 0.1. XRD has shown co-existence of tetragonal and rhombohedral phases in th…
Monophasic oxides of the formula, (Pb 0.975 Ba 0.025 )TiO 3 with excess PbO (0, 1, 3, 5 and 10 wt%) were prepared by a mixed oxide method. It was found that lead barium titanate powders indexed in a tetragonal structure. The impurity phases were detected in the calcined powders with ≥ 3 wt% of excess PbO. The impurity…
Employing electron energy-loss spectroscopy we show that small values of doping in the system ${\text{Ca}}_{2\ensuremath{-}x}{\text{Na}}_{x}{\text{CuO}}_{2}{\text{Cl}}_{2}$ strongly influence the formation of charge-transfer excitons in the Cu-O plane. We find a remarkable redistribution of spectral weight between the…
We have investigated photoluminescence (PL) properties of GaAs (15 nm)/AlAs (15 nm) and GaAs (20 nm)/AlAs (20 nm) multiple quantum wells at 10 K under high density excitation conditions at excitation energies in the region of the fundamental excitons. It has been found that the PL due to exciton-exciton scattering, th…
This study investigates the compatibility of material processing and fabrication of micro devices based on sol-gel derived lead zirconate titanate (PZT) thin films. High temperature annealing of sol-gel derived PZT may cause cracking and diffusion of structure layers. The introduction of a buffer layer, (LaxSr 1 − x )…
As diamond becomes more prevalent for electronic and research applications, methods of patterning diamond will be required. One such method, laser ablation, has been investigated in a related work. We report on the formation of surface nondiamond carbon during laser ablation of both polycrystalline and single-crystal…
This experimental work was concerned with the combination of internal EGR with an early inlet valve closure strategy for improved part-load fuel economy. The experiments were performed in a new spark-ignited thermodynamic single cylinder research engine, equipped with a mechanical fully variable valvetrain on both the…
The diesel/natural gas engine configuration provides a potential alternative solution for PM and NOx emissions reduction from typical diesel engine operations. However, their engine operations suffer from high NMHC/methane emissions and poor engine performance, especially at light loads. By increasing the diesel pilot…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionThe Preparation of Colloidally Stable, Water-Soluble, Biocompatible, Semiconductor Nanocrystals with a Small Hydrodynamic DiameterEmma E. Lees, Tich-Lam Nguyen, Andrew H. A. Clayton, Benjamin W. Muir, and Paul Mulvaney*Cite…
The effects of uniaxial stress on the 0–3 lead zirconate titanate (PZT)-portland cement (PC) composite were investigated. PZT and PC composites were fabricated using 50% of PZT by volume. At room temperature, the dielectric properties were measured under stress free and stress level up to 57 MPa at the frequency of 1–…
Anode geometry can significantly affect the electrochemical synthesis of conductive polymers. Here, the effects of anode dimensions on the electropolymerization of pyrrole are investigated. Band microelectrodes were prepared with widths ranging from 2 to 500 mum. The anode dimension has a significant effect on the res…
Abstract Blends of poly(vinyl chloride) (PVC) and polyesteramides (PEA), based on ε‐caprolactam and ε‐caprolactone, were prepared to improve the notch impact strength of PVC. Miscibility of components was assessed from glass transition temperature and is limited by the amount of PEA in the blend and by the content of…
The volatile organic compounds (VOC) from diesel engines, including formaldehyde and benzene, are concerned and remain as unregulated harmful substances. The substances are positively correlated with THC emissions, but the VOC and aldehyde compounds at light load or idling conditions are more significant than THC. Whe…
Abstract Neutron and synchrotron powder diffraction data for β‐cryolite were collected within 550‐800(880) °C. Atomic coordinates of Al, F and Na atoms were obtained by both neutron Rietveld refinement and energy minimization in solid state at DFT level of theory. It was shown that although Rietveld refinements with f…