Showing papers in "Journal of Solid State Chemistry in 1999"

TL;DR: Amorphous MnO2·nH2O in a mild 2 M KCl aqueous electrolyte proves to be an excellent electrode for a faradaic electrochemical capacitor cycled between −0.2 and +1.0 V versus SCE.

TL;DR: In this article, the influence of the oxygen content on the metal-insulator transition and the corresponding magnetic susceptibility anomaly is studied for LnBaCo2O5+δ with various oxygen stoichiometries.

TL;DR: In this paper, a one-step solid state reaction method under ambient conditions was used to prepare monoclinic CuO nanoparticles by using a single-step reaction method and the particles with an average size of 12 nm were pressed into pellets under high pressure.

TL;DR: In this article, the FT-IR and FT-Raman spectroscopy were used to characterize synthetic Mg-, Ni- and Co-hydrotalcite, and they showed that the composition changes brought about by changing the divalent metal result in small but significant changes in band positions of the modes related to the hydroxyl groups.

TL;DR: In this paper, the structure of ferromagnetic BiMnO{sub 3} synthesized at high pressure has been determined by electron diffraction and neutron powder diffraction, and the distortion is caused by a polarized Bi 6s{sup 2} lone pair.

TL;DR: The crystal structures of CeO1.68 (Ce2O3+δ), Ce7O12, and Ce11O20 with ordered oxygen vacancy distributions have been determined by refinement of single crystal neutron diffraction data collected at ambient temperature as discussed by the authors.

TL;DR: In this paper, anion exchange reactions of layered Zn, Cu, Ni, or La hydroxide nitrates with the organic anions acetate, terephthalate, and benzoate are compared.

TL;DR: Amorphous a-V2O5·nH2O in mild KCl aqueous electrolyte proves to be an excellent electrode for a faradaic electrochemical capacitor as discussed by the authors.

TL;DR: In this paper, high-temperature, high-resolution neutron powder diffraction experiments were performed to investigate the phases of WO 3 between room temperature and 850°C, and two phases were found and characterized by Rietveld refinements.

TL;DR: In this paper, the authors investigated the properties of Na3M2(PO4)2F3 (M=Al3+, V3+, Cr3+ Cr3+, Fe3+, Ga3+ and Ga3+) with respect to a three-dimensional network built up by sharing four corners between PO4 tetrahedra and M2O8F3 bioctahedra.

TL;DR: In this paper, the structural changes induced during Li removal, together with the thermal stability of the end members Ni 1− x Co x O 2, were determined by in situ X-ray measurements using a high-resolution synchrotron beam line.

TL;DR: In this article, a new structure-property relationship links atomic displacement parameters (ADP) and lattice thermal conductivity of clathrate-like compounds was proposed. But this relationship was not applied to the analysis of thermoelectric materials.

TL;DR: In this article, the properties of high-surface-area La M 1− x Cu x O 3 (Mn or Co) perovskites prepared by the citrate method were studied by H 2 TPR and O 2 TPD techniques.

TL;DR: Vanadium pentoxide gels are formed via the reaction of V2O5 powder with hydrogen peroxide and 51V NMR studies of the solution show that the dissolution of the oxide leads to the formation of solute diperoxo [VO(O2)2]− species as discussed by the authors.

TL;DR: In this paper, the transition from insulator to metal is caused by the closing of the charge transfer band gap, induced by broadening of the electronic bandwidths of the Co-3d and O-2pbands with an expansion of Co-O-Co angle.

TL;DR: In this paper, large intragrain magnetoresistance (MR) in the ordered double perovskite, Ba2FeMo6, is shown for the first time, and the latter appears near TC(340 K), i.e., above room temperature.

TL;DR: In this paper, the changes in the surface structure of mechanically activated and mechanosynthesized zinc ferrite as a function of the mechanical treatment time and the relaxation of the mechanically induced inverse spinel structure by thermal treatment in the temperature range 800-1100 K have been studied using the ESCA method.

TL;DR: In this article, it was shown that PbO behaves as a network former in these glasses and is possibly incorporated in the network as [PbO 4/2 ] 2− units.

TL;DR: In this article, three 1-D coordination polymers consisting of {l_brace}Mn[N(CN){sub 2}]{sub 2}{r_brace}{sub {infinity}} structural units and L = 2 pyridines (i.e., 2), 2,2{prime}-bipyridine (i., 3), and 4,4{prime]-bibyridine(i., 4) were synthesized and characterized by single crystal X-ray crystallography and magnetic susceptibility studies.

TL;DR: In this paper, the synthesis and characterization of two silicon clathrates, Na 8 Si 46 and Na x Si 136, by powder X-ray diffraction, combined with Rietveld profile analysis is reported.

TL;DR: In this paper, the organic-inorganic layered perovskite (C6H5C2H4NH3)2PbCl4 has been grown at room temperature using a layered solution approach.

TL;DR: In this article, perovskite-type compounds of general formula LaMn1−xCuxO3 were prepared by calcining the citrate gel precursors at 823, 923, and 1073 K, and the oxides were investigated by means of elemental analysis (atomic absorption and redox titration), X-ray powder diffraction, and magnetic susceptibility.

TL;DR: In this paper, the stable intermediate structures were optimized by a molecular mechanic approach, giving rise to new hypothetical 3D crystal structures which progress along the transition in the order of increasing density from 2.22 to 3.30 gcm−3.

TL;DR: The polymorphism of WO3 powder samples, resulting from mild mechanical treatments and from temperature changes between 30 K and room temperature, has been investigated by using Raman spectroscopy and X-ray di⁄raction.

TL;DR: In this article, the precursors were identified as having the pyrochlore-type Ce2Zr2O7+2δ phase with δ<0.06.

TL;DR: In this paper, a monoclinic hydroxapatite was synthesized by a wet method followed by heating in air at 1473 K for 1 h. The product is carbonate-free and has a Ca/P ratio of 1.65, which is slightly lower than the theoretical value (1.67) of hydroxyapatites.

TL;DR: In this article, two structural isomers of the dicyanamide (dca, N (CN)−2) complex [Cu(dca)2 (pyz)]n (pyZ=pyrazine) were prepared from aqueous solution and crystals were grown by slow diffusion and gel techniques.

TL;DR: In this paper, the relationship between structure and nonlinear optical response at 1.5 μm in thallium(I) tellurite glasses is investigated, and the results are related to the hyperpolarizability of the tellurium oxygen entities.

TL;DR: In this article, the authors show that the Co-doped LiMnO{sub 0.5] can be synthesized using a solution-based route coupled with ion exchange.

TL;DR: In this paper, the authors obtained monodispersed TiO 2 ultrafine particles from aqueous TiOCl 2 solution with a 0.67 M Ti 4+ concentration prepared by diluting TiCl 4 with the homogeneous precipitation process in the range 17-230°C.