Materials Literature
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We have recently identified metal-sandwich (MS) crystal structures and shown with ab initio calculations that the MS lithium monoboride phases are favored over the known stoichiometric ones under hydrostatic pressure [Phys. Rev. B 73, 180501(R) (2006)]. According to previous studies synthesized lithium monoboride tend…
Anomalous inter-layer atomic transport of deposited impurity atoms on Al(111) has been found by constant temperature molecular dynamics simulations. The low-energy deposition of Pt on Al(111) leads to oscillatory adsorbate-substrate interaction and to a low-temperature ballistic injection of the deposited particles to…
We study the Mott transition, antiferromagnetism, and superconductivity in layered organic conductors using the cellular dynamical mean-field theory for the frustrated Hubbard model. A $d$-wave superconducting phase appears between an antiferromagnetic insulator and a metal for ${t}^{\ensuremath{'}}/t=0.3--0.7$ or bet…
Nanosized materials have been investigated as potential medicines for several decades. Consequently, a great deal of work has been conducted on how to exploit constructs of this size range in a beneficial way. Similarly, a number of the consequences from the use of these materials have already been considered. Nanosiz…
This review paper summarizes recent advances in the quickly developing field of nanoscale ferroelectrics, analyses its current status and considers potential future developments. The paper presents a brief survey of the fabrication methods of ferroelectric nanostructures and investigation of the size effects by means…
We explore the electronic response of single-walled carbon nanotubes (SWNT) to trace levels of chemical vapors. We find adsorption at defect sites produces a large electronic response that dominates the SWNT capacitance and conductance sensitivity. This large response results from increased adsorbate binding energy an…
One consequence of strong spatial confinement of electronic wave functions in ultrasmall semiconductor nanocrystals is a great enhancement of carrier-carrier interactions, which has a dramatic effect on the spectral and dynamical properties of both single and multiexciton states. Strong carrier-carrier interactions op…
We present results on a series of two-dimensional atomistic computer simulations of amorphous systems subjected to simple shear in the athermal, quasistatic limit. The athermal quasistatic trajectories are shown to separate into smooth, reversible elastic branches which are intermittently broken by discrete catastroph…
An unexplored physical mechanism which produces a magnetoelectric effect in ferroelectric-ferromagnetic multilayers is studied based on first-principles calculations. Its origin is a change in bonding at the ferroelectric-ferromagnet interface that alters the interface magnetization when the electric polarization reve…
This study explores the photoelasticimetry as a means to investigate factors affecting the residual stresses, particularly the thermal stresses, in polymethyl methacrylate (PMMA). The aim was to study the effect of quenching temperature in three different media: air, water, and ethylene glycol, on the impact strength…
Quantitative characterization of dielectric nonlinearity in ferroelectric materials has been successfully performed using a scanning evanescent microwave microscope, and a key calibration coefficient for quantitative microscopy of nonlinear dielectric constant is derived. This unique technique has advantages of high s…
The method of sections was used to study the solubility of the components of the LiClO 4 (LiBF 4 )-diethyl carbonate (DEC)-propylene carbonate (PC) ternary system at 25°C. The phase diagrams of the systems were plotted and discussed. At this temperature, the solid phase of the LiClO 4 -DEC-PC system is pure salt while…
Twist angle effects on the response time of in-plane-switching liquid crystal displays are analyzed. The authors propose a device configuration whose top and bottom boundary liquid crystal layers are symmetric to each other with respect to the electric field direction. The analytical results of this device configurati…
This study deals with the creation and characterization of a polypropylene/calcium carbonate composite in the presence of maleic anhydride–grafted polypropylene used as a compatibilizer. In order to improve the properties of the interfacial zones, the reinforcing filler was treated with two different coupling agents,…
The fiber composites reported herein comprise a particular class of multiphase materials in which the major volumetric phase, the binder, is a rapid-hardening cement-based material and the minor volumetric phase, the reinforcement, is a fibrous steel material. A further feature of these composites was that the proport…
Incorporation of tritium in hydrogenated amorphous silicon (a-Si:H) and crystalline silicon (c-Si) at 250°C using tritium (T2) gas at pressures of up to 120atm is reported. The tritium is stored in a surface layer which is approximately 150 and 10nm for a-Si:H and c-Si, respectively. The concentration of tritium occlu…
Transition related to the Mn–Zn interaction was observed in photoluminescence (PL) study of the InMnP:Zn epilayer and the peak position blueshifted with increasing Mn concentration. X-ray photoelectron spectroscopy was used to clarify the blueshift of the PL peak. The binding energy shifts of Mn 2p and Zn 2p core leve…
The surface structure of multi-crystalline silicon (mc-Si) etched in HF/HNO 3 with various added amounts of hexafluorosilicic acid (H 2 SiF 6 ) as influencing parameter was studied. The experiments simulate the accumulation of the reaction product H 2 SiF 6 in an HNO 3 -rich and in an HF-rich solution which are used i…
Starting from a microscopic model of the atomic transport via vacancies and interstitials in alloys, a self-consistent mean field (SCMF) kinetic theory yields the phenomenological coefficients Lij. In this theory, kinetic correlations are accounted for through a set of effective interactions within a non-equilibrium d…
We develop a thermodynamic model to determine the polarization, dielectric permittivity, and tunability of epitaxial ferroelectric films on orthorhombic substrates. In particular, we study the film thickness dependence of the tunability in epitaxial (110) Ba0.6Sr0.4TiO3 films on (001) NdGaO3 substrates. The analysis t…