Phase stabilization in nitrogen-implanted nanocrystalline cubic zirconia

Gonghua Wang, Guangfu Luo, Yun Liang Soo, Renat F. Sabirianov, Hong Ji Lin, Wai Ning Mei, Fereydoon Namavar, Chin Li Cheung

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The phase stability of nanocrystallites with metastable crystal structures under ambient conditions is usually attributed to their small grain size. It remains a challenging problem to maintain such phase integrity of these nanomaterials when their crystallite sizes become larger. Here we report an experimental-modelling approach to study the roles of nitrogen dopants in the formation and stabilization of cubic ZrO 2 nanocrystalline films. Mixed nitrogen and argon ion beam assisted deposition (IBAD) was applied to produce nitrogen-implanted cubic ZrO 2 nanocrystallites with grain sizes of 8-13 nm. Upon thermal annealing, the atomic structure of these ZrO 2 films was observed to evolve from a cubic phase, to a tetragonal phase and then a monoclinic phase. Our X-ray absorption near edge structure study on the annealed samples together with first-principle modelling revealed the significance of the interstitial nitrogen in the phase stabilization of nitrogen implanted cubic ZrO 2 crystallites via the soft mode hardening mechanism.

Original languageEnglish (US)
Pages (from-to)19517-19525
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume13
Issue number43
DOIs
StatePublished - Nov 21 2011

Fingerprint

zirconium oxides
Nitrogen
Stabilization
stabilization
nitrogen
Nanocrystallites
grain size
nitrogen ions
Ion beam assisted deposition
atomic structure
hardening
Phase stability
integrity
Argon
crystallites
X ray absorption
Crystallite size
interstitials
Crystallites
Nanostructured materials

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Phase stabilization in nitrogen-implanted nanocrystalline cubic zirconia. / Wang, Gonghua; Luo, Guangfu; Soo, Yun Liang; Sabirianov, Renat F.; Lin, Hong Ji; Mei, Wai Ning; Namavar, Fereydoon; Cheung, Chin Li.

In: Physical Chemistry Chemical Physics, Vol. 13, No. 43, 21.11.2011, p. 19517-19525.

Research output: Contribution to journalArticle

Wang, Gonghua ; Luo, Guangfu ; Soo, Yun Liang ; Sabirianov, Renat F. ; Lin, Hong Ji ; Mei, Wai Ning ; Namavar, Fereydoon ; Cheung, Chin Li. / Phase stabilization in nitrogen-implanted nanocrystalline cubic zirconia. In: Physical Chemistry Chemical Physics. 2011 ; Vol. 13, No. 43. pp. 19517-19525.
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