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Segregation Phenomenon and Electrical Properties of Yttria Stabilized Zirconia Ceramics by the Addition of La2O3

Published online by Cambridge University Press:  26 February 2011

Young-Jei Oh ,
Hyung-Jin Jung  and
Hee-Soo Lee
Young-Jei Oh
Affiliation:
Korea Advanced Institute of Science and Technology, P.O.Box131, Cheongryang, Seoul, Korea
Hyung-Jin Jung
Affiliation:
Korea Advanced Institute of Science and Technology, P.O.Box131, Cheongryang, Seoul, Korea
Hee-Soo Lee
Affiliation:
Dept.of Ceramic Engineering, Yonsei Univ., Seoul, Korea
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Abstract

The influence on electrical properties of yttria-fully-stabilized zirconia with low contents of lanthana (up to 5 mol%) were studied. Phase transformation by XRD, lattice parameter, crystallite size, and chemical composition after 4h sintering at 1400°C were adopted for the characterization of the synthesized solid electrolyte. Electrical conductivity from 350°C to 800°C and frequency dependence by complex impedance method were measured to analyze the role of grain-bulk and grain boundary on the electrical conductivity respectively. Nicrostructures of the synthesized sample were observed by SEM(EDS) and TEM for the confirmation of segregation phenomena at grain boundary. Sinterability was improved in the limited amount of La2O3 addition up to 0.5 mol%. The electrical conductivity decreased with increasing the La2O3 addition overall, but slightly increased up to 1 mol% due to the substitution of La3+ for Zr4+. The overall electrical conductivity was much dependent on the contribution of grain-bulk. However, both the potential barrier in the lower La2O3 contents and segregation of second phases in the higher La2O3 contents influenced the electrical conductivity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 497
Copyright
Copyright © Materials Research Society 1988

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References

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