Materials Literature
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We report here on an experimental study of slow thermal relaxation effects from the metastable metallic-ferromagnetic phase to the insulating one in a charge-ordered manganese oxide, ${\mathrm{Pr}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}.$ The metal-insulator transition is evidenced by an abrupt jump of the resis…
There have been major advances in solid state and materials chemistry in the last two decades and the subject is growing rapidly. In this account, a few of the important aspects of materials chemistry of interest to the author are presented. Accordingly, transition metal oxides, which constitute the most fascinating c…
A novel pillared clay, i.e. pillared montmorillonite with crystallized TiO2, has been developed as a highly active photocatalyst. The TiO2 pillars in pillared montmorillonite were crystallized to anatase by hydrothermal treatment, while the porosity of the pillared clay was retained. The size of the crystallized TiO2…
We examine the reasons for the poor quantitative agreement between the structures predicted from the minimum energy configuration of first principles calculations and those deduced from surface X-ray diffraction experiments for the structure properties of the TiO2(110) surface. In order to confine all numerical approx…
Quaternary organic tetraalkylammonium hydroxide grafted on MCM-41 is a strong Brønsted base catalyst, and represents a useful alternative to soluble bases in reactions such as Knoevenagel condensations, Michael additions and aldol condensations because of their high catalytic activity under mild conditions, and good s…
The upconversion emission intensities of Er3+ ion around 550 and 660 nm in fluorozirconate glasses were measured under 800 nm excitation. Though energy transfer processes played an important role in upconversion mechanism at high concentration of ErF3, those have not been treated quantitatively. The energy transfer ra…
The effects of firing temperature on the crystallinity and the luminescent properties of phosphor have been investigated over the temperature 1000–1800°C range under preparative conditions which do not use any flux such as . The effects of particle shape and size of the ingredient on the phosphor have also been studie…
β-Zn(dca)2 and 0.12% Co(II) doped β-Zn(dca)2 contain tetrahedrally coordinated metal ions within a corrugated sheet network structure [dca = dicyanamide, N(CN)2–], β-Co(dca)2 is a spin-canted antiferromagnet (TN = 9 K), while the rutile-like octahedral α-form is a ferromagnet.
Sealed alkaline solid polymer electrolyte nickel/metal hydride laboratory cells have been constructed and tested to evaluate their properties. Studies of the cycle life, self‐discharge, and behavior of cells at different temperatures were carried out. The first results on the electrochemical behavior of an alkaline so…
An idealized structural model is proposed for materials closely related to the 2H hexagonal perovskite and with general formula A3n + 3mA′nB3m + nO9m + 6n {or A1 + x(A′xB1 – x)O3, x = [0, 1/2]}. The structures of all these compounds, considered as commensurate or incommensurate modulated composites, can be described i…
Hybrid organic-inorganic materials, in which organic and inorganic components are combined over a length scale ranging from a few Angstroms to a few tens of nanometers, are nanocomposites which offer huge potentialities for high added value applications. Numerous hybrid organic-inorganic materials have been developed…
We report the synthesis and the photophysical properties of first and second generation dendrimers built around a [Ru(bpy)3]2+ core (bpy=2,2′-bipyridine) and bearing 12 and 24 naphthyl units, respectively, in the periphery. The metallodendrimers were obtained by complexation of ruthenium trichloride with bipyridine li…
We perform a comprehensive survey of the potential energy landscapes of 13-atom Morse clusters, and describe how they can be characterized and visualized. Our aim is to detail how the global features of the funnel-like surface change with the range of the potential, and to relate these changes to the dynamics of struc…
Gluconamides can be easily functionalized to give a variety of compounds that form organogels with a high viscosity. N - n -octyl- d -gluconamide-6-benzoate gelates a large variety of organic solvents, including 1,2-xylene, chloroform, ethyl acetate, and ethanol, to form gels which are, in some cases, stable even abov…
Template-directed co-condensation was used to synthesize organo-functionalized MCM-41 silica hexagonal mesophases containing binary combinations of covalently linked phenyl and amino, thiol or allyl moieties; similar methods were used to prepare a phenyl-functionalized organo-MCM-48 silica with cubic structure.
The electrical conduction properties of rf sputter-deposited (Ba, Sr)TiO3 (BST) films on Pt and IrO2 electrodes and metalorganic chemical vapor deposited (MOCVD) BST films on a Pt electrode were investigated and a new energy band model that satisfactorily explains the observed leakage current characteristics and film…
The structure of the amorphous walls of the mesoporous material MCM-48 was investigated with a combination of high-resolution transmission electron microscopy and selected area electron diffraction, and the three-dimensional structure was reconstructed by electron crystallography. The crystals were well ordered over l…
Mn(N3)2(pyz) (pyz = pyrazine) consists of ferromagnetically coupled linear chains of {Mn(N3)2}n comprised of µ-1,1-azido bridges together with µ-pyz ligands to afford 2-D planar layers.
Optical storage properties of thin unoriented liquid crystalline and amorphous side-chain azobenzene polymethacrylate films are examined by polarization holographic measurements. The investigated materials are free radical copolymers derived from two photochromic monomers, 6-(4-oxy-4‘-cyanoazobenzene)hex-1-yl methacry…
The synthesis, structural characterization, and magnetic properties of a new Prussian blue analogue, the molecule-based ferrimagnet (V IV O)[Cr III (CN) 6 ] 2/3 · 10 / 3 H 2 O ( 1 ) ( T C = 115 K), are presented. The crystal structure is determined from the powder X-ray diffraction diagram using the Rietveld method. T…