Structural and electrical behaviour in Bi<inf>14</inf>YO<inf>22.5</inf>
83471 - 83479
MetadataShow full item record
© The Royal Society of Chemistry.Structure and electrical conductivity in the oxide ion conducting compound Bi14YO22.5 have been investigated by powder X-ray and neutron diffraction, a.c. impedance spectroscopy, measurements of transference number and ab initio molecular dynamics (MD) simulations. Phase behaviour was studied using variable temperature X-ray diffraction and differential thermal analysis. The structure at room temperature is of the βIII tetragonal-type, details of which are discussed, including its relationship to both β and δ phases of Bi2O3. Bi14YO22.5 undergoes a reversible phase transition to a cubic δ-Bi2O3 type phase at high temperatures. This phase exhibits very high electrical conductivity, with transference numbers indicating that this conductivity is almost purely ionic in nature. MD simulations confirm 3-dimensional oxide ion transport in the βIII-phase.
AuthorsStruzik, M; Malys, M; Krynski, M; Wojcik, M; Dygas, JR; Wrobel, W; Krok, F; Abrahams, I
- College Publications