Materials Literature
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Abstract The influence of the position of nitro group toward the carboxylic group on the vibration structure of the molecule was estimated. Optimized geometrical structures were calculated (HF, B3PW91, B3LYP). Experimental and theoretical FT‐IR, FT‐Raman, and nuclear magnetic resonance (NMR) spectra of the title compo…
Finite element analysis (FEA) was performed on a bi‐layer cylindrical structure consisting of a low‐density layer on top of a high‐density layer. For this model, the layers used the shrinkage behavior, viscosity, and elastic properties of barium titanate determined for the 45% and 55% green densities. The stresses pre…
Nanocrystalline zirconates of barium and lead have been synthesized using a modified reverse micellar route (avoiding alkoxides). The entire solid solution of Ba 1− x Pb x ZrO 3 (0≤x≤1) has been synthesized for the first time. Powder X‐ray diffraction studies show the monophasic nature of the powders after heating at…
Abstract The changes of the dynamic properties of the nanoconfined materials vary greatly depending on the nature of the interfaces, the chemical structure of the nanoconfined glass‐former, the experimental methods used, and, in the case of polymers, the length‐scale of the dynamics probed. Just for the glass transiti…
The synthesis, isolation and structural characterization of the sulfite polyoxomolybdate clusters alpha-(D(3h))(C(20)H(44)N)(4){alpha-[Mo(18)O(54)(SO(3))(2)]}CH(3)CN and beta-(D(3d))(C(20)H(44)N)(4){beta-[Mo(18)O(54)(SO(3))(2)]}CH(3)CN is presented. Voltammetric studies in acetonitrile (0.1 M Hx(4)NClO(4), Hx(4)N=tetr…
Following the classical concepts developed by Simon [Z. Anorg. Allg. Chem. 203, 219 (1931)], vitrification in the cooling of glass-forming melts is commonly interpreted as the transformation of a thermodynamically (meta)stable equilibrium system into a frozen-in, thermodynamically nonequilibrium system, the glass. Her…
An aqueous gelcasting process for the preparation of dense as well as porous‐sintered SiC ceramics has been described in this paper. A commercial silicon carbide powder coated with phenolic resin was used in this investigation. For the purpose of comparison, a pure SiC powder was also studied. ς potential and viscosit…
Contrary to conventional wisdom, mineralization is not the only strategy evolved for the formation of hard, stiff materials. Indeed, the sclerotized mouthparts of marine invertebrates exhibit Young's modulus and hardness approaching 10 and 1 GPa, respectively, with little to no help from mineralization. Based on bioch…
This study reports a high‐energy density piezoelectric polycrystalline ceramic composition in the system Pb(Zr 1− x Ti x )O 3 –Pb[(Zn 1− y Ni y ) 1/3 Nb 2/3 ]O 3 (PZT–PZNN). Two different Zr/Ti ratios in the PZT system were investigated: 52/48 corresponding to morphotropic phase boundary (MPB) and 56/44 corresponding…
In this paper we have developed a theory of energetics for isolated single-wall carbon nanotubes (SWNTs) deformed in the radial direction, and applied this theory to investigate their deformation characteristics and stability under hydrostatic pressure. The starting point of the theory is the strain energy of SWNTs pr…
For the first time, explicit, analytical expressions have been derived for the dependence of electrical conductivity, chemical expansion, and elastic modulus on defect concentration and oxygen partial pressure using a consistent approach. The models have been validated with experimental data for Ce 0.9 Gd 0.1 O 1.95−δ…
Mimicking sponges: Well-defined crystalline nanoparticles of cubic BaTiO3 are prepared at a very low temperature by using a bio-inspired methodology. A bimetallic alkoxide is used as a single-source precursor in a vapor-diffusion sol–gel synthesis. Water and catalyst (HCl) are delivered in a spatial and temporal gradi…
Abstract Die Entwicklung von Hybridmaterialien mit stark verbesserten Funktionen gelingt durch die Kombination geeigneter Nanomaterialien als Träger mit Motiven aus der supramolekularen Chemie. Diese “hetero‐supramolekularen” Konzepte bieten vielfältige Möglichkeiten, die Lücken zwischen der Molekülchemie, Materialwis…
Single‐phase and lead‐free Bi 0.85 La 0.15 FeO 3 multiferroic ceramics were prepared by a rapid liquid sintering method to study their crystal structure and multiferroic behaviors. Rietveld refinement of X‐ray diffraction data showed a pseudo‐cubic structure plus a small triclinic distortion. The absence of Fe 2+ ions…
Ultra‐fine zirconium diboride (ZrB 2 ) powders have been synthesized using inorganic–organic hybrid precursors of zirconium oxychloride (ZrOCl 2 ·8H 2 O), boric acid, and phenolic resin as sources of zirconia, boron oxide, and carbon, respectively. The reactions were substantially completed at a relatively low tempera…
Highly porous alumina ceramics with completely interconnected pore channels were fabricated by freezing dilute alumina/camphene slurries with solid loadings ranging from 5 to 20 vol%. This method fundamentally made full use of the three‐dimensional camphene dendritic network for producing interconnected pore channels…
The role of Pr doping on double Schottky barrier formations at ZnO single grain boundaries was investigated by the combination of current-voltage measurements, atomic-resolution Z-contrast scanning transmission electron microscopy, and first-principles calculations. Although Pr segregated to the specific atomic site a…
On the basis of Ti‐vacancy defect compensation mode, high‐permittivity La‐ and Ce‐doped barium titanate ceramics (BLTC) with perovskite structure, i.e., (Ba 1− x La x )(Ti 1− x /4− y Ce y )O 3 , where x =0.01–0.05 and y =0.05, were prepared by conventional ceramic processing techniques. Dielectric characteristics, X‐r…
We present a theoretical many-body analysis of the electron-electron (e-e) inelastic damping rate $Γ$ of electron-like excitations in the Shockley surface state band of Ag(111). It takes into account ab-initio band structures for both bulk and surface states. $Γ$ is found to increase more rapidly as a function of surf…
We have studied direct and Raman processes of the decay of electron spin states in a quantum dot via radiation of phonons corresponding to elastic twists. Universal dependence of the spin relaxation rate on the strength and direction of the magnetic field has been obtained in terms of the electron gyromagnetic tensor…