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Factors Favoring Ferroelectricity in Hafnia: A First-Principles Computational Study

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Department of Materials Science & Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
*E-mail: [email protected] (R.R.).
Cite this: J. Phys. Chem. C 2017, 121, 8, 4139–4145
Publication Date (Web):February 2, 2017
Copyright © 2017 American Chemical Society

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The surprising ferroelectricity displayed by hafnia thin films has been attributed to a metastable polar orthorhombic (Pca21) phase. Nevertheless, the conditions under which this (or another competing) ferroelectric phase may be stabilized remain unresolved. It has been hypothesized that a variety of factors, including strain, grain size, electric field, impurities and dopants, may contribute to the observed ferroelectricity. Here, we use first-principles computations to examine the influence of mechanical and electrical boundary conditions (i.e., strain and electric field) on the relative stability of a variety of relevant nonpolar and polar phases of hafnia. We find that although strain or electric field, independently, do not lead to a ferroelectric phase, the combined influence of in-plane equibiaxial deformation and electric field results in the emergence of the polar Pca21 structure as the equilibrium phase. The results provide insights for better controlling the ferroelectric characteristics of hafnia thin films by adjusting the growth conditions and electrical history.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.6b11972.

  • Data on relative permmitivity and the spontaneous polarization of different phases of hafnia used to construct Figure 3 (PDF)

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