TY - JOUR
T1 - Electrode overvoltage model for a flash state of yttria-stabilized zirconia
T2 - Validity, limitation, and open new issue
AU - Kobayashi, Kiyoshi
AU - Yamamoto, Takahisa
AU - Morita, Koji
AU - Suzuki, Toru S.
N1 - Funding Information:
Acknowledgments This work was supported by JST, CREST Grant Number JPMJCR1996, Japan, and JSPS KAKENHI (Grant Numbers 17H01317, 19H02804, and 20H02444).
Publisher Copyright:
©2022 The Ceramic Society of Japan. All rights reserved.
PY - 2022/1/1
Y1 - 2022/1/1
N2 - Since the discovery of various blackening behaviors of yttria-stabilized zirconia (YSZ) between direct current (DC) and alternating current (AC) flash treatment, several efforts have been made to explain these phenomena. In this study, we developed a novel model based on electrode overvoltage to explain the blackening behavior of YSZ. It was found that the difference in the blackening behavior by the DC and AC flash treatment of YSZ could be qualitatively explained on the basis of an electrode overvoltage model. However, the true AC-flash state is difficult to understand owing to the limit of the principal in the model. In addition, high-Amplitude voltage impedance spectroscopy revealed the nonlinearity problem between the amplitude voltage and current. As a result, new methodologies and theories that are different from conventional ones are essential to clarify the true nature of the flash state of YSZ.
AB - Since the discovery of various blackening behaviors of yttria-stabilized zirconia (YSZ) between direct current (DC) and alternating current (AC) flash treatment, several efforts have been made to explain these phenomena. In this study, we developed a novel model based on electrode overvoltage to explain the blackening behavior of YSZ. It was found that the difference in the blackening behavior by the DC and AC flash treatment of YSZ could be qualitatively explained on the basis of an electrode overvoltage model. However, the true AC-flash state is difficult to understand owing to the limit of the principal in the model. In addition, high-Amplitude voltage impedance spectroscopy revealed the nonlinearity problem between the amplitude voltage and current. As a result, new methodologies and theories that are different from conventional ones are essential to clarify the true nature of the flash state of YSZ.
KW - Blackening
KW - Electrode overvoltage
KW - Flash sintering
KW - Impedance
KW - Yttria-stabilized zirconia
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U2 - 10.2109/jcersj2.21078
DO - 10.2109/jcersj2.21078
M3 - Article
AN - SCOPUS:85122789041
VL - 130
SP - 172
EP - 179
JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
SN - 1882-0743
IS - 1
ER -