Jurecic, Vida ; Fulanovic, Lovro ; Koruza, Jurij ; Bobnar, Vid ; Novak, Nikola (2023)
Synergetic boost of functional properties near critical end points in antiferroelectric systems.
In: Physical Review Materials, 7
doi: 10.1103/PhysRevMaterials.7.114407
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

The increase of the dielectric permittivity with an electric field and enhanced energy storage properties make antiferroelectrics very attractive for high-power electronic applications needed in emerging green energy technologies and neuromorphic computing platforms. Their exceptional functional properties are closely related to the electric field-induced antiferroelectric↔ferroelectric phase transition, which can be driven toward a critical end point by manipulation with an external electric field. The critical fluctuation of physical properties at the critical end point in ferroelectrics is a promising approach to improve their functional properties. Here, we demonstrate the existence of two critical end points in antiferroelectric ceramics with a ferroelectric-antiferroelectric-paraelectric phase sequence, using the model system Pb0.99 Nb 0.02 [(Zr 0.57 Sn 0.43 )0.92 Ti 0.08 ] 0.98 O3. The critical fluctuation of the dielectric permittivity in the proximity of the antiferroelectric-to-paraelectric critical end point is responsible for the strong enhancement of the dielectric tunability (by a factor of > 2) measured at ≈ 395 K. The enhancement of the energy storage density at ≈ 370 K is related to the proximity of the ferroelectric-to-antiferroelectric critical end point. These findings open possibilities for material design and pave the way for the next generation of high-energy storage materials.

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