SCHEDULED MAINTENANCE
Characterisation, conductivity and mechanical properties of the oxygen-ion conductor La0.9Sr0.1Ga0.8 Mg0.2O3-x
Abstract
The new oxygen-ion conductor
La
0.9
Sr
0.1
Ga
0.8
Mg
0.2
O
3-x
has been prepared by conventional solid-state
reaction at high temperatures and characterised by X-ray diffraction,
scanning and transmission electron microscopy, and conductivity
(four-probe dc and impedance) measurements. The room-temperature structure
is orthorhombic, space groupPnma (no. 62), with
a=5.5391(7) Å, b=7.8236(12) Å,
c=5.5224(7) Å. The material undergoes a phase transition at
445 K to a rhombohedral structure. Mechanical property measurements at
room temperature and at 1173 K give average strength measurements of
162±14 MPa and 55±11 MPa respectively. Conductivity and
ionic transport number measurements confirm predominantly ionic
conduction. The contribution from the grain boundary conductivity is
extremely small at temperatures below 673 K. At 1073 K, an ionic
conductivity value of 0.12 S cm
-1
was recorded in
air.
- This article is part of the themed collection: Molecular Assemblies and Nanochemistry
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