%0 Journal Article
%A Guo, X.
%A Mi, S.
%A Waser, R.
%T Nonlinear electrical properties of grain boundaries in oxygen ion conductors: case of acceptor doped ceria
%J Electrochemical and solid-state letters
%V 8
%@ 1099-0062
%C Pennington, NJ
%I Soc.
%M PreJuSER-44540
%P J1 - J3
%D 2005
%Z Record converted from VDB: 12.11.2012
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000228356800046
%R 10.1149/1.1830393
%U https://juser.fz-juelich.de/record/44540