Showing papers in "Materials Research Bulletin in 1992"

TL;DR: In this article, the use of microwave-hydrothermal processing in catalyzing the synthesis of crystalline unary oxides such as TiO 2, ZrO 2 and Fe 2 O 3 and binary oxides, such as KNbO 3 and BaTiO 3.

TL;DR: LiCoO2 (400°C) as discussed by the authors is a compound that was prepared by the reaction of Li2CO3 and CoCO3 at 400°C, which has approximately 6% cobalt within the lithium layers and is stable in many of the organic-based electrolytes that are currently employed in lithium cells.

TL;DR: In this paper, a highly crystalline α-MnO2 phase has been synthesized by acid treatment of Li2Mn0.91O2 (or MnO2·0.2A2O) where A refers predominantly to H+ ions and Li+ ions.

TL;DR: In this article, the electrical conductivity of the layered compounds TlInS 2, TlGaS 2 and TlGeSe 2 was studied as a function of the temperature, perpendicularly and parallel to the layer planes.

TL;DR: In this paper, the 3D structure of V 2 O 5 gels was studied by means of the X-ray Rietveld method from a series of 00l reflections.

TL;DR: In this paper, the electrical conductivity of the BiVO 4 is analyzed in terms of ionic conductivity due to oxygen ion vacancies, and the results show that the voltage at 150° to 550°C and 29.4 MPa are obtained.

TL;DR: The crystal structures of two ternary, chalcopyrite-structured semiconductors, CuInSe2 and CuInTe2, have been determined from single crystal X-ray diffraction data as mentioned in this paper.

TL;DR: In this paper, the structural and ferroelectric properties of various bronzes are described with respect to the chemical formula M 2+ and M 4+ cations, and their properties have been compared with the results of earlier work.

TL;DR: In this paper, colorless single crystals of Na2Zn[C6H2(COO)4]·9H2O were obtained in aqueous silicagel.

TL;DR: In this paper, the elastic modulus of CVD diamond has been found to be 1143 GPa and v = 0.0691, which is quite compatible with available experimental evidence.

TL;DR: LiYF4 and LiYF5 lattices include three-dimensional frameworks constructed of 8 and 4 polyhedra connecting with each other as discussed by the authors, and K2Li1+3δY1−δF6 crystal structure is derived from elpasolite, perovskite or K2PtCl6.

TL;DR: Several MFI−nsorbate complexes presenting the H0.72Al 0.72Si95.28O192 framework composition (Si Al = 132 ) have been prepared and the observed crystal symmetries, which depend on the nature of the sorbate and on the sorbed amount, are P21/n.1.1, Pnma or P212121 (both orthorhombic) as mentioned in this paper.

TL;DR: In this paper, the X-ray diffractograms (XRD) and electron probe microanalysis (EPMA) of such films were used to conclude that copper deficient, orthorhombic Cu(I) selenide is formed.

TL;DR: In this paper, the photocatalytic activities of the prepared samples were evaluated by measuring the degradation of 1,4-dichlorobenzene and compared with that of Degussa P25 titanium(IV) oxide.

TL;DR: In this article, a layered manganic acid of the rancieite structure with a (001) ‘d’ spacing of 0.742 nm and a chemical composition of H2Mn4O9 · 3·7 H2O has been synthesized.

TL;DR: In this paper, a simple nebulization and pyrolysis technique was used to obtain good uniformity and adhesion of TiO2 films on a variety of substrates and showed appreciable photocatalytic activity toward the degradation of salicylic acid.

TL;DR: In this paper, solid solutions derived from ferroelectric Bi3TiNbO9 by cationic substitutions of La3+ for Bi3+ and (Ti4+,W6+) for Nb5+ have been synthesized using a standard ceramic method.

TL;DR: In this article, the misfit layer compounds are built of alternate sandwiches NbSe 2 (TaSe 2 ) with Nb (Ta) in trigonal prisms of Se and interface modulated double layers of BiSe; 1 3 of the Bi atoms are at distances of 3.19 A across the interface.

TL;DR: In this article, a model for the superstructure of the LiNbO3-like structure is proposed which involves intergrowths having rock salt-like structures within the overall structure of the solid solution.

TL;DR: In this paper, the single crystal structure of lead magnoniobate PbMg 1 3 Nb 2 3 O 3 was determined at 20°C using data collected with an X-ray automatic four circle diffractometer.

TL;DR: In this article, the crystal structure of a single crystal on an automatic diffractometer has been investigated and it has been shown that all the atoms belonging to this structure are octahedrally surrounded and the structure of this compound derives from the NaCl type structure.

TL;DR: XANES and EXAFS investigations on precipitated MnFe2O4 together with other results indicate the presence of trivalent manganese and divalent iron.

TL;DR: An isothermal section of the quasiternary system ZnO-TiO2-Nb2O5 at 1473 K is presented in this article, where lattice parameters and phases are discussed.

TL;DR: ABO3 perovskites can be prepared from compositionally modified gels or mixtures of A(OH)2 as mentioned in this paper, which can be used to synthesize semiconducting A2+ ions.

TL;DR: In MgO and BaZrO 3 part of the Eu 3+ ions show efficient luminescence upon charge-transfer excitation as discussed by the authors, which assists in the search for a cheap red phosphor.

TL;DR: In this article, a new phase, YBaCo2−xCuxO5+δ has been isolated with a wide homogeneity range 0.30 ≤ x ≤ 1.

TL;DR: The pyrochlore oxide Ca 2 B 2 O 7 was also found to undergo ion-exchange in acid under mild conditions to form the hydrated oxide HNbO 3 ·xH 2 O, also with small particle size and high surface area.

TL;DR: In this paper, a perovskite film was prepared by electrochemical reduction in the solution containing both Ba 2+ and Ti 4+ ions, and it was judged from the measured voltammogram that the incorporation of Ba 2 + ion into the deposited oxide during the electrolysis depends on electrochemical reductions in which H 2 O is consumed to produce OH − ion.

TL;DR: In this paper, the process of iodization of a thin layer of Ag deposited by electrodes on the internal well of a tube was investigated, and the AgI layer was formed employing several methods, which gave a mixture of β and γ AgI phases.

TL;DR: In this article, the relative positions and relative occupancies of small atom sites in the Chevrel phase system LixMo6S8 in dependence of the lithium content of the ternary compounds were determined.