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First-principles study on doping and phase stability of HfO2

Title
First-principles study on doping and phase stability of HfO2
Authors
Lee, Choong-KiCho, EunaeLee, Hyo-SugHwang, Cheol SeongHan, Seungwu
Ewha Authors
한승우
Issue Date
2008
Journal Title
PHYSICAL REVIEW B
ISSN
1098-0121JCR Link
Citation
vol. 78, no. 1
Publisher
AMER PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Based on density functional methods, relative stabilities between monoclinic, tetragonal, and cubic phases of HfO2 with cation dopants or oxygen vacancies are investigated. It is found that dopants such as Si, Ge, Sn, P, Al or Ti with ionic radii smaller than Hf stabilize the tetragonal phase but destabilize the cubic phase. In contrast, larger dopants such as Y, Gd or Sc favor the cubic phase. The ionized oxygen vacancies compensating trivalent dopants greatly stabilize both cubic and tetragonal phases. Microscopic explanations on the results are also given. The metastable phase favored by each dopant is in good agreement with experimental data. Our results can serve as a useful guide in selecting dopants to stabilize a specific phase.
DOI
10.1103/PhysRevB.78.012102
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자연과학대학 > 물리학전공 > Journal papers
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