Study of Dielectric Characteristics and Energy Storage Properties of Sr&lt;sub&gt;0.7&lt;/sub&gt;Bi&lt;sub&gt;0.2&lt;/sub&gt;TiO&lt;sub&gt;3&lt;/sub&gt; Doped with CaTiO&lt;sub&gt;3&lt;/sub&gt;

Peng Zhao,Shu Ren Zhang,Bin Tang,Cheng Tao Yang,Feng Si

doi:10.4028/www.scientific.net/kem.842.168

Abstract

Sr0.7Bi0.2TiO3 (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 (Wrec). 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.

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