Thermal ageing of nanostructured tetragonal zirconia ceramics: Characterization of interfaces
✍ Scribed by R.A. Rocha; E.N.S. Muccillo; L. Dessemond; E. Djurado
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 821 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0955-2219
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✦ Synopsis
This paper reports the preparation of nanometric powders of 3.5 mol% Y 2 O 3 -doped ZrO 2 , with controlled microstructure, by the spray pyrolysis process, assisted by ultrasonic atomizer, at relatively low temperature. As-prepared powders were found crystalline and consisted of dense and chemically homogeneous spherical particles. Conventional sintering at 1500 • C for 2 h in air yields dense ceramics of 83 nm of average grain size. The electrical properties of electrode/electrolyte interface were determined by impedance spectroscopy measurements before, during and after thermal ageing for 2000 h at 700 • C in dry air. The effect of thermal ageing on the electrical responses of the ceramic and interfaces with platinum electrodes was investigated.