Electrical conductivity of ceria nanoparticles under high pressure

H. Takamura, J. Kobayashi, N. Takahashi, M. Okada

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

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 °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∈×∈10∈-∈3 S/cm at 300 °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.

Original languageEnglish
Pages (from-to)24-32
Number of pages9
JournalJournal of Electroceramics
Volume22
Issue number1-3
DOIs
Publication statusPublished - 2009 Feb

Keywords

  • Ac impedance
  • Grain boundary
  • Ion conductivity
  • Sm-doped ceria

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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