Materials Literature
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The effect of dc magnetic bias field on the magnetoelectric coupling of a two-component magnetoelectric composite structure is investigated numerically using the finite-element method, in which the nonlinear magnetostress coupling for the magnetostrictive component is taken into account. It is shown that the magnetost…
The effect of N content on the structure and properties of rf reactively sputtered amorphous silicon nitride (a-SiNx) has been studied by Rutherford backscattering spectrometry, x-ray reflectivity, ellipsometry, and nano-indentation. The N content in the film increased with the N2 concentration in the sputtering gas u…
Transmitted light microscope and SEM observations of various growth stages, including very young forms, of lithistid demosponge spicules called desmas provided a wealth of new observations on silica deposition in desmas of most lithistid demosponge groups. In typical (pachastrellid) demosponges a basic feature of sili…
$^{55}\mathrm{M}\mathrm{n}$ and $^{139}\mathrm{L}\mathrm{a}$ NMR measurements on a high quality single crystal of ferromagnetic (FM) ${\mathrm{L}\mathrm{a}}_{0.80}{\mathrm{C}\mathrm{a}}_{0.20}{\mathrm{M}\mathrm{n}\mathrm{O}}_{3}$ demonstrate the formation of localized ${\mathrm{M}\mathrm{n}}^{3+,4+}$ states below $70\…
Abstract Polypropylene (PP) has not been used extensively in rotational foam molding because it has been traditionally considered as nonfavorable for foaming applications because of its relatively weak melt strength and melt elasticity at elevated temperatures. However, because of the unique end‐use properties of PP,…
In this paper we report precise thermal expansion data for the cubic negative thermal expansion material $\ensuremath{\gamma}\ensuremath{-}{\mathrm{ZrMo}}_{2}{\mathrm{O}}_{8}$ which has an average expansion coefficient of $\ensuremath{-}6.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}{\mathrm{K}}^{\ensurema…
Landau–Devonshire-type phenomenological thermodynamic theory is employed to explain the electric field dependence of piezoelectric properties of tetragonal single domain PbZrxTi1−xO3 (PZT). The strong nonlinearity of the converse piezoelectric coefficient under a large external electric field is proved to be intrinsic…
We report the assembly of quantum dots using an approach that attempts to capitalize on the self-assembling properties of naturally occurring proteins. Colloidal quantum dots made of cadmium selenide core and a zinc sulfide shell, (CdSe)ZnS, were incubated with a genetically modified, bacterial cellulosomal protein, c…
The growth mode of ZnO thin films can be well regulated in a molecular layer-by-layer growth by employing a ZnO buffer layer deposited on a lattice-matched ScAlMgO4 substrate and annealed at high temperature. The annealed buffer layer has atomically flat surface and relaxed (strain-free) crystal structure. The intensi…
The preparation and characterization of highly dispersed metal nanoparticles in porous anodic aluminum oxide (AAO) films are reported. Cross-linked polyacrylamide (PAM) hydrogel nanowires are prepared within the pores of an AAO template by electropolymerization of acrylamide. Metal nanoparticles are introduced into th…
We report an effective method of increasing the sp3 hybridization fraction in sputtered amorphous carbon (a-C) film by the combination of Ar ion bombardment and Si incorporation. In the deposition of an a-C film, Ar ion bombardment by controlling the applied bias voltage plays a role in creating high stress in film an…
Abstract In this study the morphology of LDPE/TPS blends prepared by a one‐step extrusion process is compared to that obtained by reprocessing of the original blends. The influence of composition and melt drawing is examined. A novel methodology based on the form factor of the dispersed particle was used to estimate t…
Diffusion of a solute in a periodic porous solid is analyzed. An expression for the effective diffusion coefficient is derived for a solute diffusing in a porous medium formed by a simple cubic lattice of spherical cavities connected by narrow tubes. This expression shows how the effective diffusion coefficient depend…
The mechanical coupling effect in a magnetoelectric (ME) composite structure in which a magnetostrictive component is bonded with a piezoelectric one is simulated by numerical technique, focusing on an optimization of the magnetoelectric coupling output. The simulation starts from an experimentally developed ME compos…
Using ab initio calculations we study the stability of Si-based cages and nanotubes stabilized by encapsulated transition metal atoms (TMAs). It is demonstrated that the stabilization of these cages and nanotubes as well as their magnetic properties are strongly guided by a delicate interplay between the attainable sy…
Room-temperature electroluminescence at 1.3 and 1.5 μm from Ge/Si quantum-dot light-emitting diodes is reported. The devices were fabricated in a mesa-type structure, with a silicon oxide layer on the top for surface/sidewall passivation. Different passivation processes were employed. We found that the integrated elec…
Highly (111)-oriented (Pb0.76Ca0.24)TiO3 (PCT) thin films were grown on Pt/Ti/SiO2/Si substrates by a sol–gel process. The Au/PCT/Pt metal–insulator–metal film capacitor showed well-saturated hysteresis loops at an applied field of 800 kV/cm with remanent polarization (Pr) and coercive electric field (Ec) values of 18…
We present a theoretical study of polymer networks, formed by connecting dendritic building blocks (DBB’s). We concentrate on the Rouse dynamics of such networks and perform our study in two steps, considering first single generalized dendrimers (GD’s) and then networks formed by such DBB’s. In GD’s the functionality…
Heusler compounds are promising candidates for future spintronics device applications. The electronic and magnetic properties of Co 2 Cr 0.6 Fe 0.4 Al, an electron-doped derivative of Co 2 CrAl, are investigated using circularly polarized synchrotron radiation and photoemission electron microscopy (PEEM). Element spec…
Relaxation and conduction mechanisms under small ac fields of laser ablated ZrTiO4 thin films were analyzed in the light of impedance and modulus spectroscopy. The overall dielectric properties were mainly dominated by a Maxwell–Wagner type of relaxation with grains and the grain boundary two distinct parts of the cir…