Electric field emission of high density O- ions from 12CaO·7Al2O3 engineered to incorporate oxygen radicals

Katsuro Hayashi, M. Hirano, Q. X. Li, M. Nishioka, M. Sadakata, Y. Torimoto, S. Matsuishi, H. Hosonoa

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


We succeeded in extracting intense O- ion beam by applying dc voltage to a microporous crystal 12CaO·7Al2O3 (C12A7) engineered to incorporate extremely large amounts of O- (1.3 × 1020 cm-3) and O2- (2.7 × 1020 cm-3) in crystallographic cages. The O- ion beam is monochromatic and the current density (∼2 μA/cm2) is higher by three orders of magnitude than the maximum value recorded for yttrium-stabilized ZrO2 (YSZ). A surface metal electrode, essential for the YSZ to dissociate a drifted O2- in the bulk into an O- and an electron on the surface, is not needed for the C12A7. The presence of extremely large concentrations of O- and O2- ions and fast oxygen-ion-conductive nature of C12A7 allow extraction of O- ions directly from the surface.

Original languageEnglish
JournalElectrochemical and Solid-State Letters
Issue number9
Publication statusPublished - Sep 1 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Electric field emission of high density O<sup>-</sup> ions from 12CaO·7Al<sub>2</sub>O<sub>3</sub> engineered to incorporate oxygen radicals'. Together they form a unique fingerprint.

Cite this