Skip to Main content Skip to Navigation
Journal articles

High-temperature mechanical behavior of proton-conducting yttrium-doped barium zirconate perovskite

Abstract : The high-temperature mechanical properties of yttrium doped barium zirconate obtained by two different routes are reported in this work. Polycrystals with composition BaZr0.85Y0.15O2.925 have been fabricated from nanopowders synthesized by a modified EDTA-citrate complexing method and conventionally sintered at 1600 °C for 24 h. The material exhibits a single cubic perovskite phase, with a homogeneous, dense and fine-grained microstructure consisting of equiaxed grains with an average size of 0.2 μm. Mechanical tests were carried out in compression between 1100 and 1325 °C in air at constant initial strain rate and at constant load. As the temperature increases and/or the strain rate decreases, a gradual transition from brittle-to-ductile behavior was found. In the brittle regime, the fracture is governed by an intergranular failure mode. In the ductile region, grain boundary sliding is the main deformation mechanism, characterized by a stress exponent of 2 and an activation energy of 570 kJ/mol.
Complete list of metadata

https://hal-centralesupelec.archives-ouvertes.fr/hal-03434145
Contributor : Céline FREYDIER Connect in order to contact the contributor
Submitted on : Wednesday, November 24, 2021 - 9:21:24 AM
Last modification on : Thursday, July 14, 2022 - 3:54:48 AM
Long-term archiving on: : Friday, February 25, 2022 - 6:05:53 PM

Files

High-temperature mechanical be...
Files produced by the author(s)

Identifiers

Citation

D. Ciria, V. Aubin, M. Jimenez-Melendo, G. Dezanneau. High-temperature mechanical behavior of proton-conducting yttrium-doped barium zirconate perovskite. Journal of the European Ceramic Society, Elsevier, 2021, 41 (2), pp.1374-1383. ⟨10.1016/j.jeurceramsoc.2020.09.069⟩. ⟨hal-03434145⟩

Share

Metrics

Record views

39

Files downloads

24