Conductivity measurements of ceria-based solid electrolytes using AC impedance
Conference
·
OSTI ID:10128551
- Lawrence Livermore National Lab., CA (United States)
The ionic conductivities of cerium oxide samples doped separately with oxides of the entire lanthanide series (except promethium) and yttrium were measured using AC impedance. A wide variation in conductivities was observed, from l {times} l0{sup {minus}2} S cm{sup {minus}1} for Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} to 2 {times} 10{sup {minus}14} S cm{sup {minus}1} for undoped ceria at 600C. Many of these ceria systems exhibited ionic conductivities higher than those of zirconia systems, making ceria a logical choice for certain low temperature applications. A correlation was found between the ionic radii of the dopant and the corresponding ionic conductivities, with ceria doped with Gd{sub 2}O{sub 3}, Sm{sub 2}O{sub 3} and Y{sub 2}O{sub 3} exhibiting the highest values. In addition, the relative contributions of the grain boundaries and grain interiors to the overall resistance was measured. The ceria/samaria and ceria/gadolinia systems showed a different response than the ceria/yttria system with regard to the effect of sintering time on the relative contributions.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10128551
- Report Number(s):
- UCRL-JC--116378; CONF-940529--1; ON: DE94007380
- Country of Publication:
- United States
- Language:
- English
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