Open AccessROLE OF GRAIN BOUNDARIES IN POLYCRYSTALLINE ZIRCONIA-BASED SOLID ELECTROLYTES
Author(s) -
Xin Guo,
Yuan Run-Zhang,
Sun Yao-Qing,
Kun Chen
Publication year - 1996
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.45.860
Subject(s) - grain boundary , materials science , crystallite , grain boundary strengthening , condensed matter physics , amorphous solid , grain boundary diffusion coefficient , microstructure , cubic zirconia , crystal (programming language) , chemical physics , crystallography , ceramic , composite material , metallurgy , physics , chemistry , computer science , programming language
On the basis of experiments, the ZrO2 grain boundaries are classified into three types: the " clean" grain boundaries, the grain boundaries with amorphous phases and the grain boundaries with crystal phases. The structure and property of the three types of grain boundaries are analyzed on .the grounds of microstructure and lattice defects. The conductivity of the crystal grain boundary phases is calculated with the effective-medium theory and found to be three times higher than that of the matrix, and an idea of further enhancing the ionic conductivity of ZrO2 by modifying grain boundaries is thus proposed. The effect of the ZrO2 grain boundaries on the emf of the oxygen sensor is discussed with simplified models.