TY  - JOUR
AU  - Guo, X.
AU  - Mi, S.
AU  - Waser, R.
TI  - Nonlinear electrical properties of grain boundaries in oxygen ion conductors: case of acceptor doped ceria
JO  - Electrochemical and solid-state letters
VL  - 8
SN  - 1099-0062
CY  - Pennington, NJ
PB  - Soc.
M1  - PreJuSER-44540
SP  - J1 - J3
PY  - 2005
N1  - Record converted from VDB: 12.11.2012
AB  - Owing to the positively charged grain boundary cores in acceptor-doped ZrO2 and CeO2, oxygen vacancies are depleted in the space charge layers. The validity of this space charge concept was checked for Y2O3-doped CeO2 ceramic of high purity. Electrical fields up to 2 x 10(5) V cm(-1) were applied to the grain boundaries of 1.0 mol % Y2O3-doped CeO2 at 400 degrees C in air, and the grain boundary properties were separated by means of impedance spectroscopy. It was discovered that the current-voltage relation for individual grain boundary was nonlinear, and that the effective grain boundary thickness increased with increasing bias, which supports the space charge concept. (C) 2004 The Electrochemical Society.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000228356800046
DO  - DOI:10.1149/1.1830393
UR  - https://juser.fz-juelich.de/record/44540
ER  -