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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM

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Investigation of the electrical conductivity of sintered monoclinic zirconia (ZrO2)

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Title
Investigation of the electrical conductivity of sintered monoclinic zirconia (ZrO2)
Author
Kwon, Oh HyunJang, ChangheuiLee, JunhoJeong, Hu YoungKwon, Young-ilJoo, Jong HoonKim, Hongjin
Keywords
Monoclinic ZrO2;  Electrical conductivity;  Impedance;  Undoped zirconia
Issue Date
201708
Publisher
ELSEVIER SCI LTD
Citation
CERAMICS INTERNATIONAL, v.43, no.11, pp.8236 - 8245
Abstract
High-density monoclinic ZrO2 was manufactured through sintering at ~1200°C by using nanosized powders. Then, the electrical conductivity was measured at a range of high temperatures (700-900°C) by electrical impedance spectroscopy (EIS). For the as-sintered monoclinic ZrO2, the measured electrical conductivity was 3.2×10-5 s/cm (for 80% TD) and 4.4×10-5 s/cm (for 89% TD) at 900°C. After aging at 900°C for 100h, the electrical conductivity of the monoclinic ZrO2 of 80%-TD decreased by more than 50%. However, after reheating at 1200°C for 1h, approximately 80% of the conductivity was recovered compared to the value of the as-sintered monoclinic ZrO2. The pure monoclinic crystal structure was retained despite the aging and reheating treatment. Based on microstructural observations of the aged and reheated monoclinic ZrO2, the changes in electrical conductivity after aging and reheating were explained by the formation and recovery of micro-cracks, respectively.
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DOI
http://dx.doi.org/10.1016/j.ceramint.2017.03.152
ISSN
0272-8842
Appears in Collections:
UCRF_Journal Papers

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