Integrated Experimental and Modeling Study of Ionic Conductivity of Scandia-Stabilized Zirconia Thin Films
Scandia-stabilized zirconia films were epitaxially grown on sapphire (0001) substrates by oxygen-plasma-assisted molecular beam epitaxy. The cubic phase was found to exist over a wider dopant concentration range than previously observed (4.6-17.6 mol% Sc2O3). The monoclinic phase was observed for dopant concentrations of 1.5 mol% and 22.5 mol %. An increase in the fraction of the monoclinic phase relative to the cubic phase decreased the ionic conductivity. The highest conductivity in the temperature range of 460-900 °C was observed for 9.9 mol % Sc2O3. Atomistic computer simulations show that the observed composition dependence can be related to changes in migration barriers for O2- ion transport with Sc3+ substitution of Zr4+ ions.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 974949
- Report Number(s):
- PNNL-SA-68380; 30472; KP1704020
- Journal Information:
- Solid State Ionics, 181(8-10):367-371, Journal Name: Solid State Ionics, 181(8-10):367-371 Journal Issue: 8-10 Vol. 181; ISSN SSIOD3; ISSN 0167-2738
- Country of Publication:
- United States
- Language:
- English
Similar Records
System Zirconia-Scandia
Electrical conductivity of zirconia stabilized with scandia and yttria