Issue 101, 2015

Structural and electrical behaviour in Bi14YO22.5

Abstract

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.

Graphical abstract: Structural and electrical behaviour in Bi14YO22.5

Article information

Article type
Paper
Submitted
12 Sep 2015
Accepted
23 Sep 2015
First published
24 Sep 2015

RSC Adv., 2015,5, 83471-83479

Author version available

Structural and electrical behaviour in Bi14YO22.5

M. Struzik, M. Malys, M. Krynski, M. Wojcik, J. R. Dygas, W. Wrobel, F. Krok and I. Abrahams, RSC Adv., 2015, 5, 83471 DOI: 10.1039/C5RA18709E

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