TY - JOUR
T1 - Phase diagram calculations of ZrO2-based ceramics with an emphasis on the reduction/oxidation equilibria of cerium ions in the ZrO2-YO1.5-CeO2-CeO1.5 system
AU - Yokokawa, Harumi
AU - Sakai, Natsuko
AU - Horita, Teruhisa
AU - Yamaji, Katsuhiko
AU - Xiong, Yueping
AU - Otake, Takanori
AU - Yugami, Hiroo
AU - Kawada, Tatsuya
AU - Mizusaki, Junichiro
PY - 2001/6
Y1 - 2001/6
N2 - Phase diagram calculations that were made previously for the ZrO2-MOm/2(m = 2, 3, 4) systems and for the ZrO2-YO1.5-MOm/2 (M = transition metals) systems have been extended to the ZrO2-YO1.5-CeO2(-CeO1.5) system to make an attempt to explain (1) thermogravimetric (TG) results as a function of oxygen potential, (2) electronic conductivity as a function of oxygen potential, and (3) a miscibility gap observed in air. The interaction parameters for the CeO2-CeO1.5-YO1.5 system were obtained from the reported oxygen nonstoichiometry in CeO2-x and rare earth doped ceria, (Ce,RE)O2-δ. The interaction parameters for the ZrO2-CeO2 subsystem were obtained so as to reproduce the observed miscibility gap at 1273 K. Those thermodynamic properties can reproduce consistently the experimental behaviors of the electronic conductivity and the TG results in the (Zr1-xCex)0.8Y0.2O1.9 solid solutions; these indicate the enhancement of reduction of CeO2.
AB - Phase diagram calculations that were made previously for the ZrO2-MOm/2(m = 2, 3, 4) systems and for the ZrO2-YO1.5-MOm/2 (M = transition metals) systems have been extended to the ZrO2-YO1.5-CeO2(-CeO1.5) system to make an attempt to explain (1) thermogravimetric (TG) results as a function of oxygen potential, (2) electronic conductivity as a function of oxygen potential, and (3) a miscibility gap observed in air. The interaction parameters for the CeO2-CeO1.5-YO1.5 system were obtained from the reported oxygen nonstoichiometry in CeO2-x and rare earth doped ceria, (Ce,RE)O2-δ. The interaction parameters for the ZrO2-CeO2 subsystem were obtained so as to reproduce the observed miscibility gap at 1273 K. Those thermodynamic properties can reproduce consistently the experimental behaviors of the electronic conductivity and the TG results in the (Zr1-xCex)0.8Y0.2O1.9 solid solutions; these indicate the enhancement of reduction of CeO2.
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U2 - 10.1361/105497101770338842
DO - 10.1361/105497101770338842
M3 - Article
AN - SCOPUS:0035357737
SN - 1547-7037
VL - 22
SP - 331
EP - 338
JO - Bulletin of Alloy Phase Diagrams
JF - Bulletin of Alloy Phase Diagrams
IS - 3
ER -