THERMOELECTRIC-POWER OF GD-DOPED BARIUM CERATE

The thermoelectric power and electrical conductivity of BaCe0.9Gd0.1O3 -delta were determined as functions of oxygen and water vapour activit ies and temperature. Regions of oxide ion, electron hole and protonic conductivity were observed. A theory of thermoelectric power of proton conductors is presented and the possibility of using thermoelectric p ower measurements to detect protonic conductivity is discussed. The th eory cannot at present explain the results of all the measurements. (C ) 1997 Elsevier Science Ltd. All rights reserved.