The origin of the ferroelectric-like orthorhombic phase in oxygen-deficient HfO2-y nanoparticles

Abstract

In this work we established the relationship between the crystalline structure symmetry, point defects and possible appearance of the ferroelectric-like polarization in HfO2-y nanoparticles. Notably, that XRD and EPR analysis revealed the formation of the ferroelectric-like orthorhombic phase in the oxygen-deficient HfO2-y nanoparticles (pure and doped with rare-earth element yttrium). DFT calculations showed that small HfO2 nanoparticles may become polar, especially in the presence of impurity atoms and/or oxygen vacancies. To explain the experimental results, we have modified the effective LGD model through the parameterization approach, focusing on the Landau expansion coefficients associated with the polar (FE) and antipolar (AFE) orderings, which agrees with the performed DFT calculations. The effective LGD model can be useful for the development of the novel generation of silicon-compatible ferroelectric nanomaterials based on the HfxZr1-xO2-y.

16 pages, 5 figures, 3 tables; submitted to "Semiconductor Physics, Quantum Electronics and Optoelectronics"

References in corpus (5)

• The Origin of Ferroelectricity in Hf${}_x$ Zr${}_{1-x}$ O${}_2$: A Computational Investigation and a Surface Energy Model
• Intrinsic ferroelectricity in Y-doped HfO2 thin films
• Structural Polymorphism Kinetics Promoted by Charged Oxygen Vacancies in HfO${}_2$
• Finite-size effects on the ferroelectricity in rhombohedral HfO${}_2$
• Ferro-ionic States and Domains Morphology in Hf${}_x$Zr${}_{1-x}$O${}_2$ Nanoparticles

Cited by in corpus (4)

• Colossal dielectric response of HfxZr1-xO2 nanoparticles
• Resistive switching and charge accumulation in Hf0.5Zr0.5O2 nanoparticles
• Sizes of Ferroelectricity Appearance and Disappearence in Nanosized Hafnia-Zirconia:Landau-type Theory
• Magnetic properties and charge transport mechanisms in oxygen-deficient HfxZr1-xO2-y nanoparticles