Study of Dielectric Characteristics and Energy Storage Properties of Sr_0.7Bi_0.2TiO₃ Doped with CaTiO₃

Abstract:

Sr_0.7Bi_0.2TiO₃ (SBT), a kind of lead-free relaxor ferroelectric, is attracting more and more attention for pulse energy storage applications due to the low remnant polarization and high energy storage efficiency (h). However, relatively low dielectric breakdown strength (DBS) limited the recoverable energy storage density (W_rec). Herein, CaTiO₃ with high intrinsic DBS was introduced in SBT. The novel solid solutions (1-x)SBT-xCT with x = 0 - 0.15 shows pure pseudo-cubic perovskite structure. When x = 0.05, the maxium polarization are improved, and the CT doping decreases the average grain size, leading to an enhanced DBS. A high energy storage properties of 1.59 J/cm³ with the h of 87.4% at 220 kV/cm is achieved in 0.95SBT-0.05CT, which demonstrates that this 0.95SBT-0.05CT is prospective materials for energy storage application.

• Periodical: Key Engineering Materials (Volume 842)
• Pages: 168-173
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.842.168
• Online since: May 2020
• Authors: Peng Zhao, Bin Tang*, Feng Si, Cheng Tao Yang, Shu Ren Zhang
• Keywords: (Sr_0.7Bi_0.2)TiO₃, Dielectric Breakdown Strength, Energy Storage, Lead-Free, Relaxor Ferroelectrics

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