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Updated: Sep 10, 2025

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
Bi0.5Na0.5TiO3-Based Relaxor Ferroelectrics with Highly Polarizable Concentrated Nanodomains for High Capacitive
Xuefan Zhou1, Zhimin Huang1, Xiaogang Luo1
1Powder Metallurgy Research Institute, State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, China.
Abstract:
The achievement of high recoverable energy density (Wrec) and efficiency (η) simultaneously in dielectric ceramics under low/moderate electric fields (E's) offers potential for use in compact microelectronics and portable devices. However, a major challenge lies in the difficulty of coexistence of high maximum polarization (Pm) and low polarization hysteresis under low/moderate E's. Here, through the modification of heterovalent ferroelectric-active ions to enhance average ionic polarizability, guarantee considerable spontaneous polarization, and disrupt long-range ferroelectric order, both the high Pm and low polarization hysteresis were obtained in the 0.80(Bi0.47Na0.47Ba0.06)TiO3-0.20Sr(Fe0.5Nb0.5)O3 relaxor ferroelectric ceramics, leading to an excellent energy storage performance with Wrec of 6.17 J/cm3 and η of 90.3% under a moderate field of 34 kV/mm. In addition, the ceramics exhibit a high and temperature-stable permittivity (εr) as well as low dielectric loss, where εr (150 °C) reached 2085 with the temperature coefficient of capacitance (TCC) ≤ ±15% over 18 to 260 °C, and the tanδ at 150 °C is as low as 0.0075. This ceramic system exhibits potential in dielectric energy-storage capacitor systems for practical applications.
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