Tunable and parabolic piezoelectricity in hafnia under epitaxial strain.

ABSTRACT: Piezoelectrics are a class of functional materials that have been extensively used for application in modern electro-mechanical and mechatronics technologies. The sign of longitudinal piezoelectric coefficients is typically positive but recently a few ferroelectrics, such as ferroelectric polymer poly(vinylidene fluoride) and van der Waals ferroelectric CuInP₂S₆, were experimentally found to have negative piezoelectricity. Here, using first-principles calculation and measurements, we show that the sign of the longitudinal linear piezoelectric coefficient of HfO₂ can be tuned from positive to negative via epitaxial strain. Nonlinear and even parabolic piezoelectric behaviors are further found at tensile epitaxial strain. This parabolic piezoelectric behavior

SUBMITTER: Cheng H 

PROVIDER: S-EPMC10776838 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature