Materials Literature
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This letter reports a Pb(Zr0.5Ti0.5)O3 (PZT) based composition, which provides high piezoelectric and electromechanical properties. The general form of the composition is Pb(Zn1/3Nb2/3)x(B1/3I′B2/3II′)y(Zr0.5Ti0.5)1−x−yO3+0.5 wt % MnO2 (x+y=0.2). Four compositions corresponding to the earlier formulation were studied.…
Amorphous Si−C−N ceramics were produced over a wide range of compositions by thermolysis of structurally different polysilazanes. The structure of the as-thermolyzed amorphous ceramics and of ceramic samples after additional heat treatments was investigated by diffraction experiments in the wide-angle and the small-an…
Single-crystalline all-perovskite SrRuO3/Ba0.7Sr0.3TiO3/SrRuO3 thin-film capacitors epitaxially grown on SrTiO3 exhibit a sharp paraelectric-to-ferroelectric phase transition at 350 K with a maximum permittivity of about 6660. This value is comparable to that of bulk ceramics and exceeds by several times the highest v…
Recent advances in the fabrication and characterization of semiconductor and metallic nanowires are proving very successful in meeting the high expectations of nanotechnologists. Although diamond has been found to possess remarkable electronic and chemical properties, development of diamond nanowires has been slow. Su…
A time-dependent Ginzburg-Landau model of plastic deformation in two-dimensional solids is presented. The fundamental dynamic variables are the displacement field u and the lattice velocity v=delta(u)/delta(t). Damping is assumed to arise from the shear viscosity in the momentum equation. The elastic energy density is…
CdS nanoparticles are incorporated into a poly(acrylic acid) (PAA) film associated with an Au electrode, and the nanoparticles are covalently linked to the matrix. Cu 2+ ions are incorporated into the CdS-nanoparticle−PAA film, and the electroswitchable photocurrent generation by the system, in the presence of trietha…
Thermoluminescence of undoped and doped CaB 4 O 7 with activators such as Cu and Mn has been investigated. The polycrystalline samples of undoped and doped CaB 4 O 7 are prepared by melting method. The formation of CaB 4 O 7 compound is checked by X-ray diffraction study and the compound is found to have orthorhombic…
Abstract Poly(vinyl pyrrolidone‐ co ‐isobutyl styryl polyhedral oligomeric silsesquioxane)s (PVP–POSS) were synthesized by one‐step polymerization and characterized using FTIR, high‐resolution 1 H‐NMR, solid‐state 13 C‐NMR, 29 Si‐NMR, GPC, and DSC. The POSS content can be controlled by varying the POSS feed ratio. The…
We have studied the simultaneous effects of magnetic and electric fields on the ground-state energy of a donor impurity confined in a polar CdSe quantum nanocrystallite embedded in a nonpolar matrix. Calculations are performed in the framework of the effective-mass approximation using the Hass\'e variational approach.…
Poly(3-dodecyl thiophene) (P3DDT) produces thermoreversible gels in o -, m -, and p -xylene (Xy). All of these gels have fibrillar network morphology and exhibit reversible first-order phase transitions. The enthalpy changes related to the polymer part of P3DDT− p -Xy gels indicate polymer−solvent complex formation ha…
An exploration of the manganese oxalate-phosphoric acid-water system under hydrothermal conditions, and using "reagent" quantities only of water, has led to the isolation of a new mixed anion framework material Mn(2)(H(2)PO(4))(2)(C(2)O(4)). This material features continuous chains of cis edge-sharing MnO(6) octahedra…
We provide a complete and detailed characterization of the temperature-dependent response to ac electrical fields of ${\mathrm{LaTiO}}_{3},$ a Mott-Hubbard insulator close to the metal-insulator transition. We present combined dc, broadband dielectric, mm-wave, and infrared spectra of ac conductivity and dielectric co…
A new type of dendritic 2-amino-2'-hydroxy-1,1'-binaphthyl (NOBIN)-derived Schiff-base ligands have been synthesized and applied to the titanium-catalyzed hetero-Diels-Alder reaction of Danishefsky's diene with aldehydes. These reactions afforded the corresponding 2-substituted 2,3-dihydro-4H-pyran-4-ones in quantitat…
Enzyme‐catalyzed, ring‐opening polymerization of biodegradable aliphatic polyesters has successfully been applied to surface‐initiated polymerization (see Figure). Using lipase B as a catalyst, a thin film of poly(ϵ‐caprolactone) (PCL) and poly( p ‐dioxanone) (PPDX) on a gold substrate (after a formation of self‐assem…
Superheating alcohol solutions of simple trimetallic vanadium(III) precursors gives the octa- and decametallic vanadium(III) clusters [V(8)(OEt)(8)(OH)(4)(O(2)CPh)(12)] (1) and [V(10)(OMe)(20)(O(2)CMe)(10)] (2). Cluster 2 is the largest vanadium(III) cluster synthesised to date. Thus solvothermal synthetic techniques…
A computational evolutionary optimization process is adopted to screen a Eu 3+ ‐doped alkali earth borosilicate system in an attempt to search for red phosphors with a high luminescent efficiency when excited by soft ultraviolet irradiation. The evolutionary optimization process involves a genetic algorithm and combin…
The magnetic-field-induced strain (MFIS) and the magnetocrystalline anisotropy in Fe19.3Ni54.2Ga26.5 ferromagnetic shape memory alloy have been investigated in a single-variant state. From the magnetization curves, the magnetocrystalline anisotropy constant K in the single crystal Fe19.3Ni54.2Ga26.5 β′ martensite phas…
Mixed metallo-porphyrin cages were selected and amplified from dynamic combinatorial libraries (DCLs) by using appropriate templates. The cages are composed of two bisphosphine substituted zinc(II) porphyrins as ligand donors and two rhodium(III) or ruthenium(II) porphyrins as ligand acceptors, and are connected throu…
We present results of density-functional calculations of structural and electronic properties of naked, stoichiometric zinc-blende-, wurtzite-, and rocksalt-derived CdSe clusters as a function of size of the cluster and of nonstoichiometric CdSe clusters with zinc-blende-derived structure. We have optimized the struct…
The atomic structure and phase separation of amorphous Si−B−C−N ceramic powder samples obtained by thermolysis of boron-modified polysilazanes were investigated using X-ray and neutron diffraction in the wide-angle and small-angle scattering regimes. The short-range order of the Si−B−C−N ceramics corresponds to that o…