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Role of Point Defects in the Physical Properties of Fluorite Oxides
Author(s) -
Duncan Keith L.,
Wang Yanli,
Bishop Sean R.,
Ebrahimi Fereshteh,
Wachsman Eric D.
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01193.x
Subject(s) - fluorite , partial pressure , bulk modulus , materials science , electrical resistivity and conductivity , modulus , conductivity , oxygen , thermodynamics , crystallographic defect , elastic modulus , mineralogy , composite material , chemistry , metallurgy , crystallography , physics , quantum mechanics , organic chemistry
For the first time, explicit, analytical expressions have been derived for the dependence of electrical conductivity, chemical expansion, and elastic modulus on defect concentration and oxygen partial pressure using a consistent approach. The models have been validated with experimental data for Ce 0.9 Gd 0.1 O 1.95−δ (GDC) with consistently good fits. In developing the model, expressions were first derived for the functional dependence of defect concentration on the oxygen partial pressure ( P O2 ) for n ‐type fluorite oxides. Expressions for the chemical expansion, elastic modulus, and electrical conductivity as functions of defect concentration are then derived and verified with experimental data.