Materials Literature
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A combination of experiments and first-principles calculations is used to show that grain boundaries in SrTiO3 are intrinsically nonstoichiometric. Total-energy calculations reveal that the introduction of nonstoichiometry into the grain boundaries is energetically favorable and results in structures that are consiste…
Abstract Intercalated and exfoliated nanocomposites were prepared by the extrusion and injection of polyamide‐6 and highly swollen or slightly swollen montmorillonite, respectively. The microstructure of pure compounds was characterized. The basal spacing was more homogeneous in swollen montmorillonite than in nontrea…
The Rietveld refinement of synchrotron-radiation diffraction has been performed to investigate the displacive-type ferroelectricity and crystal chemistry for Sr-deficient and Bi-excess strontium bismuth tantalate. The analysis of ${\mathrm{Sr}}_{0.73}{\mathrm{Bi}}_{2.18}{\mathrm{Ta}}_{2}{\mathrm{O}}_{9}$ demonstrates…
Scanning force microscopy (SFM) has been used to perform nanoscale studies of the switching behavior of Pb(Zr, Ti)O3 thin films via the direct observation of their domain structures. The study revealed a significant asymmetry of a switching pattern which is a function of the voltage polarity and original domain struct…
We have fabricated a thin film magnetic system consisting of nanoscale Mn11Ge8 ferromagnetic clusters embedded in a MnxGe1−x dilute ferromagnetic semiconductor matrix. The clusters form for growth temperatures of ∼300 °C with an average diameter and spacing of 100 and 150 nm, respectively. While the clusters dominate…
Effects of chemical substitution of the divalent transition metals has been systematically investigated in Mg$_{1-x}M_x$B$_2$ (x=0.03; M=Mn, Fe, Co, Ni and Zn). Substitution of magnetic ions, i.e., Mn$^{2+}$, Fe$^{2+}$, Co$^{2+}$ and Ni$^{2+}$, for the Mg$^{2+}$ ion suppresses $T_{\rm c}$: d$T_{\rm c}$/d$x$ is the lar…
We report on the fabrication and characterization of visible blind ultraviolet photodetectors based on MgxZn1−xO. Using pulsed laser deposition technique, Mg0.34Zn0.66O thin films with a bandgap of 4.05 eV were epitaxially grown on c-plane sapphire substrates. The structural, electrical, and optical properties of epil…
We present experimental evidence and a corresponding theory for the ferroelectric transition in the family of quasi-one-dimensional conductors (TMTTF)2X. We interpret this new transition in the frame of the combined Mott-Hubbard state taking into account the double action of the spontaneous charge disproportionation o…
Evidence is presented here for very significant improvements in film quality when Au is deposited on a self-assembled monolayer of amine-terminated poly(amidoamine) (PAMAM) dendrimers (generation G8) on SiO x . In addition, the nanomechanical response of the monolayer dendrimer film itself and the Au/dendrimer bilayer…
The polyimides are known for their practical usage as passivation or insulation in the microelectronics industry. They have excellent properties such as chemical and mechanical resistance, good insulation and planarizability. Photosensitive polyimides have significantly enhances the development in microelectronics dev…
In the ceria−zirconia system, two kinds of preparation methods using oxalic acid or hydrazine monohydrate have been investigated to improve oxygen release and storage properties at low temperatures. These processes consist of a reduction process and surface modification. The redcutants were carbon particles produced b…
Brownian dynamics simulations of hyperbranched polymers with different degrees of branching have been performed under the influence of simple shear flow. Hydrodynamic and excluded-volume interactions have been taken into account explicitly. Shear-thinning effects have been observed for all simulated degrees of branchi…
Whole aromatic polymers such as polyamides, polyimides, polyoxadiazoles, polybenzimidazoles have already been noted for their high temperature resistance and excellent physico-mechanical properties...
The incorporation of small amount of ionic groups into hydrocarbon polymers results in unique physical properties and these polymers are called ionomers. They are effectively cross-linked through the association of ionic groups, forming multiplets or clusters. These associations are thermally labile to a greater or le…
Understanding the structure of organophilic clays and the interaction between clay platelets dispersed in organic solvents is important for characterizing nanocomposites formed by organophilic clays and polymers. To understand and optimize potential processing conditions, organically modified montmorillonite clays wer…
1. Epilithic and epiphytic diatom community composition were assessed in small streams of the Melbourne region to test the effects of (a) urban density (sub‐catchment imperviousness 0–51%) and (b) stormwater drainage intensity (comparing the intensively drained metropolitan area with urban areas of the hinterland, whi…
We demonstrated successful fabrication of a multilayered nanostructure of alternating pure polymeric lamellae and gold nanoparticle-containing lamellae, both in a nanometer thickness, by utilization of thin films of symmetric polystyrene- block -poly(4-vinylpyridine), PS- b -P4VP. The strong interaction between the P4…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT20 Å Cd4In16S3514- Supertetrahedral T4 Clusters as Building Units in Decorated Cristobalite FrameworksHailian Li, Jaheon Kim, T. L. Groy, M. O'Keeffe, and O. M. YaghiView Author Information Materials Design and Discovery Group Department of Chemistry, University of Mic…
We present the results of fully-relaxed, full-potential electronic structure calculations for the new superconductor MgB2, and BeB2, NaB2, and AlB2, using density-functional-based methods. Our results described in terms of (i) density of states (DOS), (ii) band-structure, and (iii) the DOS and the charge density aroun…
Time-resolved optical measurements of electron-spin dynamics in a (110) GaAs quantum well are used to study the consequences of a strongly anisotropic electron g-tensor, and the origin of previously discovered all-optical nuclear magnetic resonance. All components of the g-tensor are measured, and a strong anisotropy…