Structure-evolution-designed amorphous oxides for dielectric energy storage.

ABSTRACT: Recently, rapidly increased demands of integration and miniaturization continuously challenge energy densities of dielectric capacitors. New materials with high recoverable energy storage densities become highly desirable. Here, by structure evolution between fluorite HfO₂ and perovskite hafnate, we create an amorphous hafnium-based oxide that exhibits the energy density of ~155 J/cm³ with an efficiency of 87%, which is state-of-the-art in emergingly capacitive energy-storage materials. The amorphous structure is owing to oxygen instability in between the two energetically-favorable crystalline forms, in which not only the long-range periodicities of fluorite and perovskite are collapsed but also more than one symmetry, i.e., the monoclinic and orthorhombic, coexist i

SUBMITTER: Yu Y 

PROVIDER: S-EPMC10213053 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature