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arXiv · 2305.14099

Energy storage properties of ferroelectric nanocomposites

Zhijun Jiang·Zhenlong Zhang·Sergei Prokhorenko·Yousra Nahas·Sergey Prosandeev·Laurent Bellaiche
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Abstract

An atomistic effective Hamiltonian technique is used to investigate the finite-temperature energy storage properties of a ferroelectric nanocomposite consisting of an array of BaTiO$_{3}$ nanowires embedded in a SrTiO$_{3}$ matrix, for electric field applied along the long axis of the nanowires. We find that the energy density \textit{versus} temperature curve adopts a nonlinear, mostly temperature-independent response when the system exhibits phases possessing an out-of-plane polarization and vortices while the energy density more linearly increases with temperature when the nanocomposite either only possesses vortices (and thus no spontaneous polarization) or is in a paraelectric and paratoroidic phase for its equilibrium state. Ultrahigh energy density up to $\simeq$140 J/cm$^{3}$ and an ideal 100% efficiency are also predicted in this nanocomposite. A phenomenological model, involving a coupling between polarization and toroidal moment, is further proposed to interpret these energy density results.

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Zhijun Jiang, Zhenlong Zhang, Sergei Prokhorenko, Yousra Nahas, Sergey Prosandeev, Laurent Bellaiche. 2023-05-23. Energy storage properties of ferroelectric nanocomposites. https://doi.org/10.1103/physrevb.107.214105

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