O. Teller et M. Martin, KINETIC DEMIXING OF HETEROVALENTLY DOPED COO IN AN ELECTRICAL-FIELD, Berichte der Bunsengesellschaft fur Physikalische Chemie, 101(9), 1997, pp. 1377-1380
Citations number
12
Categorie Soggetti
Chemistry Physical
Journal title
Berichte der Bunsengesellschaft fur Physikalische Chemie
The steady state demixing of an initially homogeneous heterovalently d
oped transition metal oxide (A,B)O in an electrical field is studied t
heoretically and experimentally. Experimental results for the demixing
of gallium-doped cobalt oxide, (Co1-xGax)O, where the dopant becomes
enriched at the anode side are presented. By using a defect model for
the doped oxide and the five-frequency model for impurity diffusion, i
t can be shown that the enrichment of Ga at the anode is due to a nega
tive apparent effective charge of the Ga3+ ions, which is caused by de
fect-dopant interactions.