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在 (Bi_0.5Na_0.5) TiO₃基陶中通过B位缺陷工程实现超高的电热反应

Weikang Lin¹, Guohui Li¹, Jin Qian¹

¹Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.

|May 10, 2024

概括

无电热材料显示出对环保冷却的承诺. 将特定的缺陷引入-二甲酸陶中显著提高了它们的电热温度变化,提高了它们的应用潜力.

科学领域:

材料科学材料科学材料科学
固态物理固态物理
热力学是一种热力学.

背景情况:

由于环境问题,无电热 (EC) 铁电对于下一代固态制冷至关重要.
目前的无EC材料与以为基础的对应材料相比表现较差,限制了它们的实际使用.
阶段场模拟表明,受控的缺陷固定可以增强可逆极化和EC材料的变化.

研究的目的:

为了研究B点缺陷对-双酸 (BNT) 陶的电热性质的影响.
为了提高无铁电材料的性能,用于固态制冷应用.

主要方法:

通过引入Li+和Nb5+离子,在BNT陶中构建B点缺陷.
在6kV mm-1.的电场下直接测量电热温度变化.
阶段场模拟以了解缺陷在增强偏振反应中的作用.

主要成果:

达到超高EC温度变化: ΔTpos = 1.77K和 ΔTneg = 1.49K在65°C.
在广泛的温度范围内 (55-120°C) 显示出显著的负EC温度变化 (ΔTneg>1K).
在广泛的温度范围 (25-130°C) 中, ΔTneg 保持在 0.70 K 以上,表明性能强.

结论:

引入中度B位缺陷有效地提高了BNT陶中的电热反应.
优化的BNT陶对实用的固态制冷应用具有巨大的潜力.
本研究提出了一种可行的策略,通过缺陷工程来改善无铁电材料的EC性能.

关键词:

在B站点缺陷工程方面,B站点缺陷工程没有的陶.电热效应是一种电热效应.形态变异的相位边界阶段场模拟的相场模拟.可逆变化的可逆变化.

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