Materials Literature
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We present density of states and electronic transport calculations of single vacancies in carbon nanotubes. We confirm that the defect reconstructs into a pentagon and a nonagon, following the removal of a single carbon atom. This leads to the formation of a dangling bond. Finally, we demonstrate that care must be tak…
The Sr-substituted Ba2NaNb5O15 (Ba2−xSrxNaNb5O15) thin films were prepared on the La0.05Sr0.95TiO3 substrates by pulsed laser deposition. When the substrate temperature was fixed at 700°C, the thin films exhibited highly c-axis orientation and smooth surface. The c-axis orientation and surface roughness do not depend…
Nanosized (Sr2FeMoO6)1−x∕(CeO2)x composites were prepared by Sr2FeMoO6 (SFMO) obtained by sol-gel and nanosized CeO2 powders. The magnetoresistance (MR) of composites is explored as a function of the molybdate/insulator composition and magnetic field. The enhancement of the low-field magnetoresistance is observed with…
Comparative studies of the microstructure, micro‐Raman spectroscopy, and dielectric properties of PbSc 0.50 Nb 0.25 Ta 0.25 O 3 (PSNT) thin films and nanoceramics were carried out over a wide range of temperature (100–520 K) and frequency (100 Hz to 1 MHz). The microstructure of PSNT films revealed an in‐plane compres…
Electromigration experiments using Cu∕low-k interconnect tree structures were carried out in order to study the effects of active atomic sinks and reservoirs on interconnect reliability. In all cases, failures occurred after a long period of void growth. Kinetic parameters were extracted from resistance versus time da…
Sandvik Sanicro 25 is an austenitic alloy with excellent high-temperature strength and corrosion resistance based on an economical composition.
The versatile preparation of the polyelectrolyte multilayered capsules functionalized with gold nanorods (AuNRs) is described. By seed-mediated growth of AuNR directly onto the capsules, stable complexation of the AuNRs onto the capsules can be achieved (see image). The resulting capsules show improved optical stabili…
The atomistic origin of the atomic vacancy or nanocavity induced hardening in hollow nanotubes and nanoporous structures has long been a puzzle. An analysis from the perspective of bond-order–length-strength correlation mechanism [C. Q. Sun, Prog. Solid State Chem. 35, 1 (2007)] has led to solutions that show that the…
UFG Cu was found to experience two stages of strain hardening processes under uniaxial tensile stress, which was similar to the Stage IV and V of CG Cu after large plastic deformation. The storage of dislocations in small grains and dynamic recovery caused by annihilation of dislocations and GB-mediated processes were…
An analytical model for size-dependent interface phonon transmission and thermal conductivity of nanolaminates is derived based on the improved acoustic mismatch theory and the Lindemann melting theory by considering the size effect of phonon velocity and the interface lattice mismatch effect. The model suggests that…
Abstract To study temperature‐induced changes in the specific enthalpy of materials, the differential scanning calorimetry technique (DSC) is a powerful experimental approach. It is well‐established in physical chemistry and materials science but less familiar in continuum mechanics. In this context, the balance equat…
To explore alternatives to the use of pure Au in Ohmic contact RF microelectromechanical switches, we have measured changes in the electrical resistivity and nanoindentation hardness of a series of sputter deposited Au–V and Au–V2O5 thin films. Increasing V content in the Au–V alloys increases resistivity and hardness…
Applications of carbon nanotubes in different fields, ranging from nanomedicine to photophysics, have emerged since the discovery of this new carbon structure. Functionalization of the nanotubes enhances solubility, facilitates handling as well as provides a way to introduce new molecular entities that will generate i…
Phase-change materials based on chalcogenide alloys have been widely used for optical data storage and are promising materials for nonvolatile electrical memory use. However, the mechanism behind the utilization is unclear as yet. Since the rewritable data storage involved an extremely fast laser melt-quenched process…
A spin quintet: The electronic and molecular structure of the metacyclophane-based spin-quintet tetraradical 1 with a sterically controlled rigid structure and small fine-structure parameters is characterized. Pulse-ESR based 2D electron spin nutation spectroscopy allows the spin multiplicity of 1 to be unequivocally…
According to the theory of Veselago, when a particle immersed within a metamaterial with negative refractive index is illuminated by plane wave, it experiences a reversed radiation force due to the antiparallel directions of the phase velocity and energy flow. By employing an ab initio method, we show that, in the lim…
In this paper, we have studied the electrical conductivity for different compositions of the zinc vanadate semiconducting glasses within a wide temperature range. We have analyzed the temperature dependence of the electrical conductivity within the framework of various models for the hopping conduction. We have observ…
Abstract Cure reaction between a series of N ‐methylaniline‐blocked polyisocyanates, based on 4,4′‐methylenebis(phenyl isocyanate), poly(tetrahydrofuran) and several substituted N ‐methylanilines, and n ‐decanol has been studied. The solid‐state isothermal cure reaction was carried out using hot‐stage FTIR spectroscop…
Relaxor ferroelectric Pb(Sc0.5Nb0.5)O3 ceramics were synthesized by a modified solid oxide reaction method. The x-ray diffraction and Raman scattering analysis affirmed that annealing dominated the ordering degree of PSN samples. The measurements on dielectric response and ferroelectric behavior indicate the prominent…
Understanding and controlling polymorph selection is important because the structure of a crystal is critical to its properties. We have explored polymorph selection during nucleation in the hard-core repulsive Yukawa fluid. This model has two polymorphs (bcc and fcc), the relative stability of which can be adjusted b…