在超四角薄膜中通过相间应变的巨大极化
Linxing Zhang1, Jun Chen2,3, Longlong Fan1
1Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
概括
使用相间应变的应变工程产生超四角酸 (PbTiO3) 薄膜. 这种方法实现了巨大的极化和增强的热稳定性,为功能材料增强提供了新的途径.
科学领域:
- 材料科学
- 固态物理
- 薄膜技术
背景情况:
- 应变工程是提高材料功能的关键方法.
- 开发超四边形和高极化等增强性质的方法对于先进的应用至关重要.
研究的目的:
- 展示使用相间压力实现超四角性和巨极化的一般和实用方法.
- 研究工程酸 (PbTiO3) 薄膜的结构和铁电特性.
主要方法:
- 使用介相应应变的表面复合薄膜的制造.
- 使用先进技术对格子参数和偏振进行表征.
- 工程阶段的热稳定性分析.
主要成果:
- 在PbTiO3薄膜中达到1.238的外平面与内平面格子参数比率,明显高于散装 (1.065).
- 观察到一个巨大的残余极化236.3μC/cm2,几乎是已知的铁电的两倍.
- 证明了超四角阶段的稳定性高达725°C,超过大体过渡温度 (490°C).
结论:
- 跨相应变的方法是诱导超四边形和巨极化的可行和有效方法.
- 设计的PbTiO3薄膜具有显著增强的铁电和热性能.
- 这种应变工程策略有可能提高其他各种功能材料的性能.
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