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説明:

Yttria-doped zirconia has been shown to undergo nitridation in air by flash sintering using direct current (DC) electric fields, resulting in the formation of zirconium oxynitride, Zr(N,O). This study performed the microstructure analysis primarily using scanning transmission electron microscopy for 8 mol%Y2O3-ZrO2 (8YSZ) nitrided by isothermal flash sintering protocol under DC electric fields in air. The findings confirmed the existence of a threshold current density for Zr(N,O) formation. The nitrided 8YSZ grains comprised crystal-oriented Zr(N,O) fine ellipsoid-shaped grains with 10 – 20 nm in size. The formation of this structure is attributed to the nucleation manner of the Zr(N,O) grains to align their {001} planes to those of the original 8YSZ grains. The transformation of 8YSZ into Zr(N,O) during nitridation could be considered to precede by a replacement of their anions from oxygen to nitrogen while maintaining the cation framework of the respective crystal structures, as predicted by Bechteler et al.

権利情報:

• In Copyright
  

キーワード: nitridation, zirconia, flash event, zirconium nitride, transmission electron microscopy

刊行年月日: 2025-02-04

出版者: Elsevier BV

掲載誌:

• Journal of the European Ceramic Society (ISSN: 09552219) vol. 45 issue. 7 117265

研究助成金:

• Japan Society for the Promotion of Science JP19H05788
• Ministry of Education, Culture, Sports, Science and Technology
• Japan Science and Technology Agency
• Core Research for Evolutional Science and Technology JPMJCR1996
• Core Research for Evolutional Science and Technology 24K21226
• Core Research for Evolutional Science and Technology 24K01156

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.8687

公開URL: https://doi.org/10.1016/j.jeurceramsoc.2025.117265

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更新時刻: 2026-10-29 16:52:55 +0900

MDRでの公開時刻: 2026-10-29 18:33:26 +0900