Boosting energy storage at moderate fields in Sr₀.₇Bi₀.₂TiO₃ weakly polar relaxor via BiNi2/3Ta1/3O₃-induced ferroelectric-paraelectric composite structure

IF 5.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2026-03-01 Epub Date: 2025-11-15 DOI:10.1016/j.scriptamat.2025.117101

Yuming Mao , Jingji Zhang , Mo Chen , Min Fang , Ning Yan , Zhihao Lou , Yun Zhou

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Abstract

The weakly polar relaxor Sr₀.₇Bi₀.₂TiO₃ is renowned for its exceptional energy efficiency but suffers from low maximum polarization. To overcome this trade-off, we introduce BiNi_2/3Ta_1/3O₃ to design a composite structure of coexisting ferroelectric A₄B₃O₁₂ and paraelectric ABO₃ phases. With increasing dopant, the A₄B₃O₁₂ phase is progressively replaced by paraelectric ABO₃ and pyrochlore Bi₂Ti₂O₇, raising the phase-transition temperature. The optimal composition comprises 70.67% P4/mbm ABO₃, 28.49% Fmmm A₄B₃O₁₂, 0.75% Fd3m Bi₂Ti₂O₇, and 0.09% Pnna BiTaO₄, forming polar clusters and a coherent boundary between the ABO₃ and A₄B₃O₁₂ phases. This yields a high energy storage density of 5.12 J cm^-3 an ultrahigh efficiency of 97.13% at a high breakdown strength of 460 kV cm^-1, together with a figure of merit of 175.90 J cm^-3 and environment-independent stability. These results establish the composite as a highly promising candidate for high-performance dielectric energy-storage devices.

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助推Sr 0 .₇Bi 0中等规模油田储能。通过bini2 / 3ta1 / 30o₃诱导的铁电-准电复合结构的2 TiO₃弱极性弛豫剂

弱极性松弛器Sr 0 .₇Bi 0。₂TiO₃的能源效率很高，但最大极化率较低。为了克服这种权衡，我们引入bini2 / 3ta1 / 30o₃来设计一个共存的铁电相A4B3O12和亲电相ABO₃的复合结构。随着掺杂量的增加，A4B3O12相逐渐被准电ABO₃和焦绿石Bi2Ti2O7取代，相变温度升高。最佳组成为70.67% P4/mbm ABO₃，28.49% Fmmm A4B3O12, 0.75% Fd3m Bi2Ti2O7和0.09% Pnna BiTaO4，形成极性团簇和ABO₃和A4B3O12相之间的一致边界。在460 kV cm-1击穿强度下，储能密度高达5.12 J cm-3，效率高达97.13%，品质系数为175.90 J cm-3，稳定性与环境无关。这些结果使该复合材料成为高性能介电储能器件的极有前途的候选材料。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.