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接口氧八面联接驱动的强大的铁电在长轴Na_0.5Bi_0.5TiO₃薄膜中

Haojie Han¹, Qinghua Zhang², Wei Li¹

¹State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.

Research (Washington, D.C.)

|July 19, 2023

概括

在 bismuth titanate (NBT) 薄膜中的接口合会诱导特定的对称性,增强铁电性质. 这项研究强调了氧八面体合对新型功能的长远影响.

科学领域:

材料科学材料科学材料科学
固态物理固态物理
晶体学晶体学是指结晶学.

背景情况:

氧八面体旋转 (OOR) 决定了矿氧化物的特性.
长轴应变和接口合调节OOR,但区分它们是具有挑战性的.

研究的目的:

通过接口氧八面联接,在 bismuth titanate (NBT) 薄膜中设计特定的对称性.
调查接口合对NBT薄膜特性的影响,区分它与表轴应变.

主要方法:

在不同基板 (Nb:SrTiO3和La0.5Sr0.5MnO3缓冲Nb:SrTiO3) 上,NBT表层膜的生长.
诱导对称性和铁电性质的分析 (残留物极化,分解强度).

主要成果:

接口氧八面体合,而不是表轴应变,在NBT膜中诱导了不同的对称性.
带有La0.5Sr0.5MnO3缓冲层的NBT膜显示了一个单临床阶段,具有创纪录的高余极化 (42μC cm−2) 和分解强度 (7.89 MV cm−1).
接口合效应证明了整个薄膜厚度的长距离传播.

结论:

接口氧八面联接是控制矿膜结构和特性的一种强大工具.
这种方法为基于NBT的材料提供了一条实现增强铁电功能的途径.
了解远程接口效应对于设计先进的矿异构结构至关重要.

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