Abstract
Diffusion of oxide ions along heterostructured yttria-stabilized zirconia (YSZ) epitaxially grown on single crystalline MgO (001) is investigated. Pulsed laser deposition is used for the epitaxial growth and focused ion beam was applied to open the lateral surface of the YSZ-MgO interface layers and to enable incorporation and diffusion of oxygen. The sample is annealed in 18O2 environment to trace oxide ion transport with Al2O3 layers atop to block diffusion perpendicular to surface of the YSZ plane. Time-of-flight secondary mass ion spectrometry (TOF–SIMS) analyze the planar diffusion profiles. Diffusivity and surface exchange rate are estimated by SIMS data fitting. As a result, it is identified that both oxide ion diffusion and surface incorporation rates are significantly enhanced on surface of the heterostructured YSZ on MgO (001) compared to bulk YSZ.
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Abbreviations
- YSZ:
-
Yttria-stabilized zirconia
- STO:
-
Strontium titanate
- PLD:
-
Pulsed laser deposition
- FIB:
-
Focused ion beam
- SEM:
-
Scanning electron microscopy
- TOF–SIMS:
-
Time-of-flight secondary ion mass spectrometry
- XRD:
-
X-ray diffraction
- k :
-
Surface exchange coefficient (cm/s)
- D :
-
Oxide ion self-diffusion coefficient (cm2/s)
- c gas :
-
Relative concentration of 18O in the environment gas during the ion diffusion
- c surface :
-
Relative concentration of 18O at the surface
- c :
-
Realtive concentration of 18O in YSZ
- h :
-
k/D
- c hg :
-
Relative natural background concentration of 18O
- ALD:
-
Atomic layer deposition
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Acknowledgements
This research was supported by the Hydrogen Energy Innovation Technology Development Program of the National Research Foundation (NRF) of Korea funded by the Korean Ministry of Science and ICT (MSIT) (No. NRF-2019M3E6A1064697). This work was also supported by the Korea Electric Power Corporation (Grant Number: R17XA05-57), the Agency for Defense Development (UD170107GD), Republic of Korea and Korea University Internal Grant.
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Bae, K., Jang, D.Y., Park, J.S. et al. Direct Measurement of Ion Diffusivity in Oxide Thin Film by Using Isotope Tracers and Secondary Ion Mass Spectrometry. Int. J. of Precis. Eng. and Manuf.-Green Tech. 7, 405–410 (2020). https://doi.org/10.1007/s40684-019-00169-3
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DOI: https://doi.org/10.1007/s40684-019-00169-3