Electronic Conductivity of 20 mol % YO[sub 1.5] Doped CeO[sub 2]

The temperature and the oxygen partial pressure dependencies of hole and electron conductivity of 20 mol % doped (20 YDC) were measured by a dc polarization method using a Hebb-Wagner ion-blocking cell from 973 to 1273 K at oxygen partial pressures to The electron conductivity is proportional to in the lower region. In the high oxygen potential region, a small polarization method was applied to avoid the failure of gas tightness at the ion blocking interface. This enabled the hole contribution, which is found to be proportional to in the higher region to be distinguished. The activation energy of electron conduction is 2.25 eV (at The activation energy of hole conduction is 1.24 eV (at © 2002 The Electrochemical Society. All rights reserved.