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Issue 101, 2015
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Structural and electrical behaviour in Bi14YO22.5

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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

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The article was received on 12 Sep 2015, accepted on 23 Sep 2015 and first published on 24 Sep 2015

Article type: Paper
DOI: 10.1039/C5RA18709E
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Citation: RSC Adv., 2015,5, 83471-83479
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    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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