Materials Literature
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Some basic properties of nonradiating systems are considered. A simple connection is established between the existence of residual electromagnetic potentials and the current density spectrum of the system. The properties of specific configurations based on toroidal and supertoroidal currents are modeled with the finit…
We explore two possible ways to enhance the critical temperature $T_c$ in the dilute magnetic semiconductor Mn$_{0.08}$Ga$_{0.92}$As. Within the context of the double-exchange and RKKY pictures, the ternary alloys Mn$_{x}$Cr$_{0.08-x}$Ga$_{0.92}$As and Mn$_{0.08}$Ga$_{0.92}$As$_y$P$_{1-y}$ might be expected to have $T…
A finite-difference time-domain (FDTD) numerical analysis is used to demonstrate that a toroidal solenoid, coaxial with an electric dipole, is a remarkable non-radiating configuration. It can be used to measure the dielectric permittivity of any ambient matter. It becomes a directional radiator at an interface between…
We report a bulk magnetisation study of the low temperature magnetic phases in the Mn site substituted half doped manganite series Pr_(0.5)Ca_(0.5)Mn_(1-x)Al_(x)O_(3). Our results indicate the formation of self organised structures in this series of compounds which is driven by electronic phase separation and stabilis…
The first vapor phase self-assembled heterocatalytic structure on surface is build from cobalt 5,10,15,20 tetrakis (4-aminophenyl)-21H, 23H-porphine through imide bonds. This heterogeneous catalyst possesses essential thermal and temporal stability along with catalytic activity in oxidation processes of organic substr…
Artificial ${\mathrm{PbTiO}}_{3}/{\mathrm{SrTiO}}_{3}$ superlattices were constructed using off-axis rf magnetron sputtering. X-ray diffraction and piezoelectric atomic force microscopy were used to study the evolution of the ferroelectric polarization as the ratio of ${\mathrm{PbTiO}}_{3}$ to ${\mathrm{SrTiO}}_{3}$ w…
This review covers important advances in recent years in the physics of thin-film ferroelectric oxides, the strongest emphasis being on those aspects particular to ferroelectrics in thin-film form. The authors introduce the current state of development in the application of ferroelectric thin films for electronic devi…
The electronic and piezoelectric properties of the boron nitride (BN) nanotubes are investigated with the hybrid density functional (B3LYP) method. We first study bulk h-BN and BN sheet and find that the B3LYP band structure and energy gap are consistent with the GW results. The B3LYP band gap is larger than the LDA o…
We have modified Landau-Khalatnikov approach and shown that the pyroelectric response of inhomogeneous ferroelectric-semiconductor films can be described by using six coupled equations for six order parameters: average displacement, its mean-square fluctuation and correlation with charge defects density fluctuations,…
Abstract On irradiation with UV light, the photochromic dimer of 1,4-bis(imidazolyl)tetrafluorobenzene produced the colored transient species in solution and solid. Though the dimerization reaction to form the photochromic dimer prevents the isolation and characterization of the colored species at room temperature, th…
This article reports the results of an experimental and computational study on the reaction of trimethylindium, In(CH3)(3), adsorbed on TiO2 nanoparticle films. Experimentally, Fourier transform infrared (FTIR) spectra have been measured by varying In(CH3)(3) dosing pressure, UV irradiation time in the absence and pre…
The surface electronic structure of 1500-Å-thick Fe3O4(100) films has been investigated by spin-resolved photoemission spectroscopy with vacuum ultraviolet synchrotron radiation. The films, epitaxially grown on MgO(100) substrates using plasma-assisted molecular-beam deposition, are briefly exposed to air during trans…
Calculations are presented for the structural, electronic, and vibrational properties of the different Ti8C12 metallocarbohedrynes. (Please note that we adopt the name "metallocarbohedrynes" instead of "metallocarbohedrenes" to denote the acetylenic nature of C2 units in this class of clusters demonstrated by several…
Abstract Highly selective formation of benzophenone (99.1%) from diphenylmethane is reported for the first time using H2O2 (30%) as an oxidant and Co/MCM-41 as the catalyst.
Substantial photoinduced changes of ultraviolet (UV) -visible (UV-vis) optical spectra were observed for the Au nanoparticles prepared by a “touch” seed-mediated growth technique on the surface of indium-tin-oxide substrate. The phototreatment was performed by two-color coherent laser beams with a wavelength of 1060 n…
The self-assembly behavior of the complexes of DNA with fully surface-protonated poly(amidoamine) (PAMAM) dendrimer of generation four has been studied as a function of the overall complex composition. The complex composition ( x ) was expressed by the molar ratio of the positively charged ammonium groups in the dendr…
Thin V2O3 films were deposited on a piezoelectric substrate by electron-beam evaporation. Surface acoustic waves were generated by interdigital transducers. The attenuation and sound velocity were investigated from 260 to 10 K, providing an insight into the temperature-dependent electrical, dielectrical, and elastic p…
Abstract One-dimensional coordination polymer of [Ru2(piv)4(μ-CN)W(CN)7]n2n− (Hpiv = pivalic acid) has been synthesized in the presence of PPh4+. The X-ray crystal structure reveals an alternating arrangement of ruthenium(II,III) dimers and [W(CN)8]3− ions in a 1-D chain. The magnetic susceptibility data (4.5–300 K) s…
In ferroelectric materials, hysteresis behavior is very difficult to model due to its nonlinear and history-dependent characteristics. Among approaches that are able to describe unsaturated loops, many of them are either very complicated (numerical procedures must be employed) or the resulting loops contain some undes…
We have synthesized ferroelectrics of M6Ti2Nb8O30 (M=Ba, Sr) with filled tungsten-bronze structure. The microstructures and dielectric properties of the present materials have been investigated as well as the behavior and features of the ferroelectric phase transition. Similar to perovskite ABO3, tungsten-bronze struc…