Preprint Article Version 1 This version is not peer-reviewed

The Effect of Co-Doping at the A-Site on the Structure and Oxide Ion Conductivity in (Ba0.5-xSrx)La0.5InO3-δ: A Molecular Dynamics Study

Version 1 : Received: 15 October 2019 / Approved: 16 October 2019 / Online: 16 October 2019 (04:55:22 CEST)

A peer-reviewed article of this Preprint also exists.

Hwang, K.-J.; Hwang, H.-J.; Lee, M.-H.; Jeong, S.-M.; Shin, T.H. The Effect of Co-Doping at the A-Site on the Structure and Oxide Ion Conductivity in (Ba0.5−xSrx)La0.5InO3-δ: A Molecular Dynamics Study. Materials 2019, 12, 3739. Hwang, K.-J.; Hwang, H.-J.; Lee, M.-H.; Jeong, S.-M.; Shin, T.H. The Effect of Co-Doping at the A-Site on the Structure and Oxide Ion Conductivity in (Ba0.5−xSrx)La0.5InO3-δ: A Molecular Dynamics Study. Materials 2019, 12, 3739.

Journal reference: Materials 2019, 12, 3739
DOI: 10.3390/ma12223739

Abstract

The molecular dynamics simulation has been used to investigate the structural and transport properties of (Ba0.5-xSrx)La0.5InO3-δ (x=0, 0.1, 0.2) oxygen-ion conductor. The previous studies reported that the ionic conductivity of Ba-doped LaInO3 decreases because Ba dopant forms narrow oxygen path in the lattice, which could hinder the diffusion of oxygen ion. In this study, we reveal the mechanism to improve the ionic conductivity by Ba and Sr co-doping on La site in LaInO3 perovskite oxide. The results show that the ionic conductivity of (Ba0.5-xSrx)La0.5InO3-δ increases with increasing numbers of Sr ions, which oxygen diffusion paths including Sr ion have larger critical radius than Ba ions. The RDF calculations showed the heights of peak in composition including Sr ions is lower and broaden, so oxygen ions moved easily into other oxygen sites.

Subject Areas

oxide ion conductivity; perovskite oxide; molecular dynamics simulation; ceramics electrolyte

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