The mechanism of oxide ion conductivity in bismuth rhenium oxide, Bi28Re2O49

Abstract

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Variable-Temperature Multinuclear Solid-State NMR Study of Oxide Ion Dynamics in Fluorite-Type Bismuth Vanadate and Phosphate Solid Electrolytes

“…regarding the Bi 28 Re 2 O 49 54 and Bi 1-x Nb x O 1.5+x 55 phases, which utilise dopant atoms that adopt variable O coordination, but also undergo doping-induced symmetry lowering of the crystal structure from cubic to tetragonal; this in turn leads to correspondingly lower oxide-ion conductivity than in the vanadate materials.…”

Insight into Design of Improved Oxide Ion Conductors: Dynamics and Conduction Mechanisms in the Bi0.913V0.087O1.587 Solid Electrolyte

“…Simulations showed a much larger conductivity contribution from the MoO x groups, with a “zig-zag” mechanism between the edges of the Bi 2 O 3 columns. Bismuth rhenate Bi 0.933 Re 0.066 O 1.633 (Bi 28 Re 2 O 49 ) has a structure made up of isolated ReO x polyhedra dispersed in a Bi–O sublattice, and AIMD simulations on this material showed similar conduction pathways as those described qualitatively for Bi 0.913 V 0.087 O 1.587 . Finally, the case of Bi 0.9375 Nb 0.0625 O 1.5625 is somewhat different as the Nb atoms are statistically distributed across the Bi sites rather than forming a separate sublattice.…”

Dynamics in Bi(iii)-containing apatite-type oxide ion conductors: a combined computational and experimental study

“…[4][5][6] Understanding the dynamics and the conduction pathways in these materials in relation to their structural characteristics is a key requirement for improving their properties through smart design. [7][8][9][10][11][12][13] One group of solid electrolytes of particular interest due to high oxide ion conductivities are apatite-type materials, especially lanthanum silicates and germanates. [14][15][16][17][18][19] Conductivities have been reported reaching up to 6 × 10 -2 S cm −1 at 800 °C for the mixed silicate-germanate La9.33Si2Ge4O26 composition, 20 with high intermediate-temperature conductivities also reported (e.g.…”