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Effect of the calcium dopant on oxide ion diffusion in yttria ceramics

Published online by Cambridge University Press:  31 January 2011

Noriko Saito ,
Hajime Haneda ,
Isao Sakaguchi  and
Takayasu Ikegami
Noriko Saito
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science, 1–1 Namiki, Tsukuba, Ibaraki 305–0044, Japan
Hajime Haneda
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science, 1–1 Namiki, Tsukuba, Ibaraki 305–0044, Japan
Isao Sakaguchi
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science, 1–1 Namiki, Tsukuba, Ibaraki 305–0044, Japan
Takayasu Ikegami
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Science, 1–1 Namiki, Tsukuba, Ibaraki 305–0044, Japan
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Abstract

Tracer oxygen diffusion coefficients, D*, in polycrystalline yttria doped with Ca have been determined by a gas–solid exchange technique and secondary ion mass spectrometry. Samples containing few pores were used to avoid their influences on diffusion profiles. The resulting profiles were assigned only to volume diffusion; no grain boundary diffusion was observed. According to the effects of Ca doping on D*, the Ca contents are divided into three regions. In a Ca content region of 0–0.17 mol%, D* changed a little with Ca doping and took a minimum experimentally at 0.02 mol%. D* increased significantly within a range of 0.17–0.54 mol% and saturated at 0.54 mol% or above because of a solubility limit. The activation energies of oxygen diffusion were estimated at 249–282 kJ/mol.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 8 , August 2001 , pp. 2362 - 2368
Copyright
Copyright © Materials Research Society 2001

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References

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