Interstitial oxygen in the Ga-based melilite ion conductor: A neutron total scattering study

In this paper we report a neutron total scattering experiment coupled to pair distribution function analysis (PDF) on a recently discovered Ga-based oxide-ion conductor characterized by interstitial oxygen migration. In particular, this study focuses on the short-range order analysis of the defect s...

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Bibliographic Details
Published in:International journal of hydrogen energy 2012-05, Vol.37 (9), p.8073-8080
Main Authors: Mancini, Alessandro, Tealdi, Cristina, Malavasi, Lorenzo
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Conductors (devices)
Data processing
Distortion
Distribution functions
Energy
Exact sciences and technology
Fuels
Hydrogen
Interstitial oxygen
Interstitials
Ionic conductivity
Migration
Pair distribution function analysis
Scattering
Short range order
Total scattering
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Summary:In this paper we report a neutron total scattering experiment coupled to pair distribution function analysis (PDF) on a recently discovered Ga-based oxide-ion conductor characterized by interstitial oxygen migration. In particular, this study focuses on the short-range order analysis of the defect structure in La1.50Sr0.50Ga3O7.25 with the aim of shedding light on the position of the interstitial oxygen and on the distortion induced in the structure by the extra-oxygen. The data analysis reveals that the preferred position, at low-temperature, for the interstitial oxygen is within the pentagonal ring formed by the Ga1 and Ga2 atoms and shifted with respect to the centre of the pentagon. ► Pair distribution function analysis of melilite-type Ga-based oxide-ion conductor. ► Analysis of the local structure of the material containing interstitial oxygen. ► Comparison among different models to locate the position of the extra-oxygen.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2011.09.157