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The sacrificial use of core–shell particles offers a versatile strategy for generating porous structures while increasing oxide–oxide interfaces within porous materials through diffusion of oxide species from pore surfaces to grain interfaces. In this study, carbon fiber (CF)–nickel hydroxide core–shell particles were combined with zirconia and calcined to produce porous zirconia sintered bodies containing nickel oxide at zirconia grain boundaries. Core–shell particles bearing vertically aligned platy nickel hydroxide on CF surfaces are prepared by a hydrothermal reaction. Upon calcination with zirconia at 1300°C for 12 h, the CF cores were removed by combustion, and the nickel hydroxide shells were converted into tubular nickel oxide hollow particles, whose interiors acted as pores within the zirconia matrix. Complementary analyses—including X-ray diffraction, electron microscopy, elemental mapping, and multiscale synchrotron X-ray computed tomography—revealed that nickel oxide is present in minute amounts, forming thin layers at zirconia grain boundaries and on portions of the pore surfaces. Compared with zirconia sintered without the core–shell particles, the zirconia-core-shell particle system suggests that interfacial diffusion of nickel oxide suppresses zirconia grain growth. These results demonstrate that both the CF core and the nickel hydroxide shell act sacrificially to create interconnected pores while designing additional oxide–oxide interfaces at pore surfaces, thereby generating an increased three-phase oxide–oxide–pore interfacial environment within the sintered bodies.

権利情報:

• In Copyright
  

キーワード: nickel oxide diffusion

刊行年月日: 2026-02-12

出版者: Royal Society of Chemistry

掲載誌:

• CRYSTENGCOMM (ISSN: 14668033) vol. 28 issue. 11 p. 1828-1836

研究助成金:

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.6223

公開URL: https://doi.org/10.1039/D5CE01187F

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更新時刻: 2026-03-19 14:27:01 +0900

MDRでの公開時刻: 2026-03-19 13:36:22 +0900