Carvalho, T., Antunes, E., Calado, J., Figueiredo, F.M., and Frade, J.R. (2012) Lanthanum oxide as a scavenging agent for zirconia electrolytes. Solid State Ionics, 225. pp. 484-487.

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Abstract

The present work demonstrates that additions of lanthanum oxide can counter the negative grain boundary effects of relatively high silica contents in 8 mol% yttria-stabilized zirconia (YSZ). This can be predicted by thermodynamic analysis, showing strong affinity between silica and lanthanum oxide at typical sintering temperatures. Microstructural analysis revealed the onset of La- and Si-rich precipitates, and impedance spectroscopy confirmed a positive impact on grain boundary conductivity. Gradual oversaturation of lanthana in YSZ with decreasing temperature allows one to extend these effects by heat treatment at intermediate temperatures. This procedure enhances the positive effects of additions of lanthana on the specific grain boundary conductivity, while minimizing the negative impact on bulk conductivity.

Item ID:	57713
Item Type:	Article (Research - C1)
ISSN:	1872-7689
Keywords:	Zirconia; Solid electrolyte; Impurity; Scavenging; Grain boundary conductivity
Copyright Information:	© 2012 Elsevier B.V. All rights reserved.
Projects and Grants:	INNOVNANO — Materiais Avançados, FCT Portugal, Eulanest Project 066-SOCs
Date Deposited:	23 Aug 2019 01:26
FoR Codes:	09 ENGINEERING > 0912 Materials Engineering > 091201 Ceramics @ 50% 09 ENGINEERING > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified @ 50%
SEO Codes:	86 MANUFACTURING > 8610 Ceramics, Glass and Industrial Mineral Products > 861002 Ceramics @ 50% 86 MANUFACTURING > 8610 Ceramics, Glass and Industrial Mineral Products > 861099 Ceramics, Glass and Industrial Mineral Products not elsewhere classified @ 50%
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