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.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Science(all)
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering