### Abstract

The space charge density at the surface of yttria-stabilised zirconia (YSZ) containing 2–10 mol% yttria was determined from differential capacity measurements of YSZ/gold interfaces at 750–850 K. The oxygen vacancy concentration in the sub-surface layer was determined as a function of temperature and bias potential by fitting the experimental data at positive bias potentials to predictions based on a Boltzmann-type expression. The vacancy concentration at the interface increases with decreasing bias potential, and reaches a temperature-dependent maximum value at negative bias potentials. The thermal activation parameter for this process is 0.27–0.46 eV. A thermodynamic model for the near-surface defect structure of YSZ is proposed, in which oxygen vacancies are assumed to be distributed randomly over a fraction of the total number of oxygen sub-lattice sites. The fraction of sites that is available for oxygen vacancy distribution increases with yttria content and temperature.

Original language | Undefined |
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Pages (from-to) | 2564-2571 |

Number of pages | 8 |

Journal | Journal of materials chemistry |

Volume | 11 |

Issue number | 10 |

DOIs | |

Publication status | Published - 2001 |

### Keywords

- IR-72260
- METIS-203050

## Cite this

ten Elshof, J. E., Hendriks, M. G. H. M., Bouwmeester, H. J. M., & Verweij, H. (2001). The near-surface defect structure of yttria-stabilised zirconia determined by measurement of the differential capacity.

*Journal of materials chemistry*,*11*(10), 2564-2571. https://doi.org/10.1039/b100923k