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ac Impedance Study of Zirconia Doped with Yttria and Calcia
Author(s) -
Gong Jianghong,
Li Ying,
Zhang Zhongtai,
Tang Zilong
Publication year - 2000
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.1151-2916.2000.tb01247.x
Subject(s) - arrhenius equation , activation energy , ionic conductivity , yttria stabilized zirconia , conductivity , materials science , grain boundary , doping , cubic zirconia , thermal conduction , ternary operation , ternary numeral system , lattice (music) , condensed matter physics , electrical resistivity and conductivity , thermodynamics , ceramic , chemistry , composite material , electrode , physics , electrolyte , microstructure , optoelectronics , quantum mechanics , computer science , acoustics , programming language
The ionic conductivity in the system (1 − 0.08 x − 0.12 y )ZrO 2 –0.08 x Y 2 O 3 –0.12 y CaO (where x + y = 1 and y = 0–1) has been investigated using the complex impedance technique at 523–973 K. Doping CaO in the ZrO 2 –Y 2 O 3 system may result in an increase in the activation energy for lattice conduction and depress the grain‐boundary effect on conduction. Analysis of the temperature dependence of the lattice conductivity, according to the familiar Arrhenius equation, predicts that the examined ternary system may exhibit greater lattice conductivity than the ZrO 2 –Y 2 O 3 binary system at higher temperatures. Preliminary explanations for these experimental phenomena and predictions also have been presented.