Acta Metallurgica Sinica (English Letters) ›› 2022, Vol. 35 ›› Issue (11): 1925-1934.DOI: 10.1007/s40195-022-01412-8

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Surface Structures and Their Relative Stabilities of Orthorhombic YAlO3: A First-Principles Study

Sheng Lu, Jianning Zhang, Huajian Wu, Yiren Wang, Yong Jiang()   

  1. State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha, 410083, China
  • Received:2021-12-29 Revised:2022-02-22 Accepted:2022-03-02 Online:2022-11-10 Published:2022-05-25
  • Contact: Yong Jiang, yjiang@csu.edu.cn

Abstract:

First-principles energetics calculations were performed to investigate the structures and relative stabilities of six low miller-index surfaces of orthorhombic YAlO3 (YAP). The stoichiometric YAP (100) and (001) were predicted to have the lowest surface energies of 1.91 and 1.96 J/m2, respectively. Using a thermodynamic defect model, non-stoichiometric YAP surface energies were further predicted as a function of ${P}_{{\text{O}}_{2}}$(${P}_{{\text{O}}_{2}}<1\ \mathrm{atm}$) and temperature (T). All the results were combined to construct the surface phase diagrams at T = 300 and 1400 K, revealing the strong correlation of the surface stabilities of YAP with its surface stoichiometry.

Key words: YAlO3, Stoichiometry, Surface energy, Surface stability, First-principles