New free-solute ferrocene/ferricinium electrochemistry, in liquid electrolyte on TI-containing oxocuprate superconducting electrodes studied at several temperatures above and below T, shows no discontinuities or abnormalities at the transition, in contrast with solid-electrolyte behaviour but possibly in accord with theoretical predictions regarding vibronic interactions or reorganisation barriers.
Enhanced Oxide Ion Conductivity in Stabilized δ-Bi2O3. -Bi12.5Ln1.5O24.5 (Ln: La, Nd, Eu, Er, Y) materials are synthesized by reaction of stoichiometric amounts of Bi2O3, Ln2O3, and NH4ReO4 (Bi:Ln:Re = 12.5:1.5:1; air, 800°C, 36 h). The samples are characterized by powder XRD and conductivity measurements. Ln-and Re-doped δ-Bi2O3 materials exhibit low-temperature (<400°C) oxide ion conductivities that are significantly higher than previously reported for δ-Bi2O3 phases and are comparable to those of BIMEVOX (e.g. Bi 2 V 0.9 Cu 0.1 O 5.35 ) materials, with the La containing phase showing the highest conductivity. These materials offer excellent potential for low temperature applications in non-reducing conditions as ceramic oxygen generators e.g., for portable oxygen supplies. -(PUNN, R.; FETEIRA, A. M.; SINCLAIR, D. C.; GREAVES*, C.; J.
A new computational analysis of tilt behaviour in perovskites is presented. This includes the development of a computational program – PALAMEDES – to extract tilt angles and the tilt phase from molecular dynamics simulations. The results are used to generate simulated selected-area electron and neutron diffraction patterns which are compared with experimental patterns for CaTiO3. The simulations not only reproduced all symmetrically allowed superlattice reflections associated with tilt but also showed local correlations that give rise to symmetrically forbidden reflections and the kinematic origin of diffuse scattering.
The title solid solutions are prepared from stoichiometric mixtures of BaCO3, TiO2, and Co3O4 (Pt crucible, 1648 K for 2 d (y = 0.1), 1473 K for 3 d (y = 0.2), 1373 K for 3 d (y = 0.3), 1398 K for 6 d (y = 0.4)).
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