Materials Literature
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Doped ceria (CeO2) compounds are fluorite type oxides which show oxide ionic conductivity higher than yttria stabilized zirconia, in oxidizing atmosphere. As a consequence of this, considerable interest has been shown in application of these materials for ‘low temperature operation (500–650 8C)’ of solid oxide fuel ce…
An improved theoretical analysis on the electrical characteristics of ferroelectric memory field-effect transistor (FeMFET) is given. First, we propose a new analytical expression for the polarization versus electric field (P-E) for the ferroelectric material. It is determined by one parameter and explicitly includes…
Eu-doped BaTiO3 thin films with a pseudo-cubic perovskite structure were successfully fabricated on magnesia substrates at low temperature by using a high-concentration sol–gel process, in which the newly developed gel-aging process on substrate was employed. Film microstructure, crystallinity, sintering properties an…
Samples of ice XII made on isobaric heating of high-density amorphous ice (HDA) were recovered at 77 K and characterized by X-ray diffraction. Studies by differential scanning calorimetry (DSC) revealed, in addition to the intense exotherm from the ice XII → cubic ice transition, on heating at 30 K min−1 a reversible…
Pyrochlore-type bismuth tin oxide, Bi2Sn2O7, is a technologically important material used in applications such as catalysis and gas sensing. Its room temperature structure has been solved by a method of simulated annealing of combined X-ray and neutron diffraction data, followed by Rietveld refinement. With 176 crysta…
We present the temperature-dependent thermolysis of siloxy-substituted ZnO single-source precursors into zinc and zinc oxide, respectively. The solid-state pyrolysis at low temperatures leads to the formation of ZnO powder with a very high surface area whereas the thermolysis in solution yields ZnO colloids. The mater…
The reaction of the neutral triangle [Mn3O(O2CR)6(L)3] with 1,1,1-tris(hydroxymethyl)ethane (H3thme) affords novel dodecanuclear and octanuclear manganese complexes with unusual ladder-like cores built from edge-sharing triangles.
The preparation, crystal structures and magnetic properties of four different manganese(II) compounds of formula [Mn(bipym)Cl2]n·2nH2O (1), [Mn2(dpp)2(H2O)2Cl4]·2H2O (2), [Mn(dpp)(H2O)2]n(ClO4)2n·1.5nH2O (3) and [Mn(dpp)(dca)2]n (4) [bipym = 2,2′-bipyrimidine, dpp = 2,3-bis(2-pyridyl)pyrazine and dca = dicyanamide ani…
A series of octupolar molecules derived from the boroxine framework were designed and their optical nonlinearities were investigated by performing harmonic light scattering experiments in solution; the molecules were found to combine excellent transparency in the near UV-visible region (lambdamax < or = 280 nm) and si…
The 4'-dimethylaminoflavylium ion in aqueous solution undergoes an intricate network of chemical reactions controlled by pH and light excitation. It is shown that nine different forms are involved, including two species that are not present in previously investigated compounds of the flavylium family. The thermodynami…
We have synthesized low-molecular-weight, triazole ring-appended 2'-deoxyuridine hydrogelators that gelate pure water at a concentration as low as 0.2 wt% and these compounds display different aggregation and network structures as evidenced by their SEM images, FTIR spectra and minimum gel concentrations.
New catalysts TiO2–SiO2 (Ti–SBA) with pore sizes of 37 and 65 Å have been synthesized by grafting titanium on a structured mesoporous SBA15 (SBA for Santa BArbara and 15 for hexagonal structure) by means of titanium tetrachloride in the gas phase. These catalysts have been tested in the selective epoxidation of cycloo…
New chemistry needed to facilitate the replacement of axial ligands (X) in Ni3(dpa)4X2 complexes (dpa = the anion of dipyridylamine) has been explored and used to replace X = Cl by X = CN, NCNCN, and CCPh. The resulting compounds, 3, 4, and 5, respectively, have been characterized by X-ray crystallography and cyclic v…
For high-temperature thermoelectric power generators, single-crystal-like polycrystals of misfit-layered cobaltites were fabricated using an in situ topotactic conversion of aligned “reactive seed” platelet particles and the highly textured ceramics exhibited strong anisotropy with improved electrical conductivity.
The methods of coordination chemistry are extended to fabricate hollow spheres of inorganic materials. In particular, in the present work a novel approach is successfully put forward to synthesize ZnO submicrometer hollow spheres, in which the coordination polymer [Zn(4,4′-bipy)(NCS)2]n with a 1D chain structure is in…
In the work reported in this paper, we demonstrate that Ag+–Keggin ion colloidal particles are excellent templates for the synthesis of organized assemblies of silver nanoparticles, wherein the Keggin ion host plays the role of a UV-switchable reducing agent. More specifically, we investigate the formation of aqueous…
Free base porphyrin molecules form well-defined and ordered nanoclusters in mixed solvents with absorption characteristics that significantly differ from those of the monomer form. These self-assembled crystallites in acetonitrile/toluene (9 ∶ 1, v/v) can be deposited as thin films on a nanostructured TiO2 electrode u…
Abstract Polyoxometalates (POMs) nanorods, hollow particles, microtubes, and 3D‐ordered tube systems were prepared using a novel and simple PEG/H 2 O liquid system. POM nanorods with various diameters (30−400 nm) and lengths (500 nm to 2 μm) were produced in a well‐controlled manner. (© Wiley‐VCH Verlag GmbH & Co.…
Double-walled carbon nanotubes (DWNTs) were prepared using floating chemical vapor deposition by adding a small amount of sulfur into the catalyst. The outer diameter of the DWNTs is from 1.5 to 3 nm. Raman study on DWNTs shows that the interlayer distance between the inner and outer tubes varies from 0.33 to 0.41 nm.…
Ultrafine-grained steel bars with a cross section of 18 mm square were fabricated through a multi-pass warm caliber-rolling for a 0.15%C-0.3%Si-1.5%Mn steel. The average ferrite grain sizes of 0.43 μm, 0.70μm and 1.2μm were obtained in the isothermal rolling processes at 773K, 823K and 873K, respectively. Despite of i…