Materials Literature
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The data on the present degree of purity of chalcogenide glasses for fiber optics, on their methods of production and on the properties, which are essential for their actual application, are generalized. The content of limiting impurities in the best samples of chalcogenide glasses is 10–100 ppb wt.; of heterophase in…
The program EXPO2009 is the evolution of EXPO2004 [Altomare, Caliandro, Camalli, Cuocci, Giacovazzo, Moliterni & Rizzi (2004). J. Appl. Cryst . 37 , 1025–1028]. EXPO2009 performs all the steps of ab initio structure solution by powder data: indexing, space-group determination, estimation of the reflection integrat…
Commonly, electroluminescence (EL) from Ge nanocrystals (Ge NCs) has been obtained by room temperature (RT) Ge implantation into a SiO2 matrix followed by a high temperature anneal. In the present work, we have used a novel experimental approach: we have performed the Ge implantation at high temperature (Ti) and subse…
We present a detailed study of tunnel magnetoresistance (TMR) in La0.45Sr0.55MnO3/La0.67Sr0.33MnO3/SrTiO3/Co spin valve structures. The nonlinear current-voltage (I-V) characteristics of the 25×25 μm2 junctions, when modeled in the framework of elastic tunneling through trapezoidal potential barrier, yield a barrier h…
Substitutionally doped Si1−xMnx thin films were fabricated by a magnetron cosputtering method at a low growth temperature. X-ray absorption fine structure (XAFS) and x-ray diffraction (XRD) techniques were used to investigate the structures of the Si1−xMnx thin films. The XRD results exhibit that no secondary phases s…
We have investigated thermal expansion and surface tension of highly doped Si and Ge melts under microgravity conditions. The experiments were conducted in the TEMPUS facility on-board of a Zero-G aircraft. The thermophysical properties were quantified by analyzing the images of levitated droplets. Both Si and Ge are…
This paper reports the growth of carbon nanostructures on Si (100) substrate in the absence of catalyst using radio‐frequency plasma enhanced chemical vapor deposition (RF‐PECVD). A variety of carbon nanostructures have been grown by low pressure high density plasma process at 400°C using a methane/argon mixture. Vari…
Epitaxial SrTiO3 films were fabricated by laser molecular beam epitaxy on bare and TiO2 buffered GaN(0002), respectively. The whole deposition processes were in situ monitored by reflection high energy electron diffraction (RHEED). X-ray diffraction (XRD) was carried out to study the growth orientation and crystalline…
The distribution of the normalized critical transport current (critical current normalized with respect to the original value) of Bi2223/Ag/Ag alloy composite tape under bending strain of 0%–0.833% was studied experimentally and analytically. The experimental results were analyzed by a modeling approach based on the r…
Thermocompression bonding of carbon nanotubes (CNTs) to metallic substrates is studied using molecular dynamics. The interaction of the CNT and the metal cluster at high temperature is investigated first. For the diffusion bonding process, the effects of temperature and external pressure are examined. In addition, we…
Individual tin oxide (SnO2) nanowire and three-dimensional (3D) branched SnO2 nanowires decorated with Au nanoparticles are investigated as the substrates for surface-enhanced Raman scattering (SERS) application. Rhodamine B, isothiocyanate with a concentration of 1.0 μM/l can be easily detected due to the localized s…
The time-dependent dielectric breakdown (TDDB) of Cu damascene interconnects was investigated, noting the time variations in stress-induced leakage current. Copper interconnects normally have symmetric current-voltage curves, which suggests that defects are distributed symmetrically between two Cu lines. Although the…
Exact analytic formulas for calculating the effective permittivity, permeability, and crossed magnetoelectric tensors for photonic crystals in the long-wavelength limit are presented. The formulas are valid for arbitrary Bravais lattice and form of inclusions, which can be dielectric, magnetic, or chiral. We have appl…
Slow waves on chains or lattices of resonant elements offer a unique tool for guiding and manipulating the electromagnetic radiation on a subwavelength scale. Applications range from radio waves to optics with two major classes of structures being used: (i) metamaterials made of coupled ring resonators supporting magn…
Nanoparticles of tin dioxide embedded in silica matrix were synthesized by ion implanting a Sn+ ion beam in a silica slide and by annealing in oxidizing atmosphere at 800 °C. A detailed structural and optical characterization was performed by using glancing incidence x-ray diffraction, transmission electron microscopy…
Well-crystallized Ba(Fe1/2Nb1/2)O3 thin films were grown on Pt/TiO2/SiO2/Si substrates in various oxygen pressures at 550 °C by pulsed laser deposition. X-ray diffraction analysis revealed that the thin films had a single phase of perovskite structure. The lattice constants of thin films increased obviously with decre…
At the first part of this work, three different textile dyes (disperse orange 11, 13 and 37) were separately doped (1% w/w) to the nematic liquid crystal (E7). Single‐walled nanotube and fullerene C60 in a small amount (0.05% w/w) were mixed to these solutions at the second stage. Order parameters, threshold voltages,…
The most peculiar feature exhibited by the I(V) characteristics of amorphous-chalcogenide materials is undoubtedly its S-shaped behavior. This type of characteristics is very important for the technological application, e.g., in the field of nanoscale solid-state memories. In this paper we give a microscopic particle…
This work examines the enhancement of current on/off ratio in field effect transistor devices with bundled single-walled carbon nanotubes (CNTs) by incorporating a substrate etching step before the electrical cutting for metallic CNT elimination. The etching step prevents the damaging of the semiconducting CNTs while…
The method to synthesize single-walled carbon nanohorns (SWCNHs) using gas-injected arc in water (GI-AIW) has been experimentally studied. GI-AIW is known as one of the cost-effective methods to obtain SWCNHs. It was revealed that the yield of SWCNHs significantly decreases with the increase in water temperature altho…