Journal
JOURNAL OF ELECTROCERAMICS
Volume 22, Issue 1-3, Pages 24-32Publisher
SPRINGER
DOI: 10.1007/s10832-008-9432-3
Keywords
Sm-doped ceria; Ion conductivity; Grain boundary; Ac impedance
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This paper describes the electrical conductivity of ceria nanoparticles under high pressure ranging from 2 to 6 GPa. The samples used were pure and acceptor-doped ceria nanoparticles with a grain size of approximately 2 nm prepared by mixing hexamethylenetramine and metal nitrate solutions. The size of ceria nanoparticles was controlled to be 2 to 15 nm by varying heat-treatment conditions. The in-situ electrical conductivity measurements under high pressure were conducted by using an ac-impedance spectroscopy. By applying a pressure of 6 GPa at 300 A degrees C, the green compact of 6 mol % Sm-doped ceria nanoparticles was densified; a relative density of 93% was achieved. The sample showed an electrical conductivity of 3 x 10 (-aEuro parts per thousand 3) S/cm at 300 A degrees C under 6 GPa. The enhancement of electrical conductivity under high pressure seems to be related to ionic conduction in the vicinity of grain boundaries.
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