Electrical conductivity of ceria nanoparticles under high pressure

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

研究成果: Article査読

18 被引用数 (Scopus)


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.

ジャーナルJournal of Electroceramics
出版ステータスPublished - 2009 2月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 凝縮系物理学
  • 材料力学
  • 電子工学および電気工学
  • 材料化学


「Electrical conductivity of ceria nanoparticles under high pressure」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。