The influence of defect structure changes at phase transition on electrical properties in the Bi0.75Pr0.25O1.5 oxide ion conductor

Marcin Małys , Jan Jamroz , Franciszek Krok , J. Maier , A. Kyriacou , S. Ahmed , I. Abrahams , Wojciech Wróbel

Abstract

The structural properties of Bi0.75Pr0.25O1.5 have been investigated by powder X-ray and neutron diffraction as a function of temperature up to around 800 °C. A layered rhombohedral structure is confirmed throughout the temperature range studied, with an order-disorder type phase transition (β2 ↔ β1) at ca. 730 °C. This transition is accompanied by partial migration of the oxide ions from the fluorite-like blocks of the layered structure to interstitial sites in the van der Waals gap between blocks. A reversible step change in total conductivity, associated with the phase transition, is preceded by non-linear behaviour observed in the Arrhenius plot of total conductivity at lower temperatures. A theoretical model based on a modification of the “cube-root” model successfully describes the conductivity data through the phase transition, showing the transition to involve a jump in inter-planar conductivity correlated with the appearance of interstitial oxide ions in the van der Waals gap. While the “cube root” model has been successfully used to explain phase transitions in classic 3-dimensional ionic conductors, the present study represents the first example of application of this model to a lower dimensional system.
Author Marcin Małys (FP / SSID)
Marcin Małys,,
- Solid State Ionics Division
, Jan Jamroz (FP / SSID)
Jan Jamroz,,
- Solid State Ionics Division
, Franciszek Krok (FP / SSID)
Franciszek Krok,,
- Solid State Ionics Division
, J. Maier
J. Maier,,
-
, A. Kyriacou
A. Kyriacou,,
-
, S. Ahmed
S. Ahmed,,
-
, I. Abrahams
I. Abrahams,,
-
, Wojciech Wróbel (FP / SSID)
Wojciech Wróbel,,
- Solid State Ionics Division
Journal seriesSolid State Ionics, ISSN 0167-2738, e-ISSN 1872-7689
Issue year2020
Vol348
Pages1-10
Publication size in sheets0.5
Article number115284
ASJC Classification1600 General Chemistry; 2500 General Materials Science; 3104 Condensed Matter Physics
DOIDOI:10.1016/j.ssi.2020.115284
URL https://www.sciencedirect.com/science/article/pii/S0167273819311439?via%3Dihub#!
Languageen angielski
Score (nominal)70
Score sourcejournalList
ScoreMinisterial score = 70.0, 14-09-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 0.952; WoS Impact Factor: 2018 = 2.886 (2) - 2018=2.68 (5)
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