探索BiFeO3-PbTiO3-SrTiO3三极系统,以在低温和高温下获得良好的压电特性
Anton Tuluk1, Sybrand van der Zwaag1
1Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS Delft, The Netherlands.
Materials (Basel, Switzerland)
|November 14, 2023
概括
这项研究探讨了用于高温应用的酸 (PbTiO3) 和酸 (SrTiO3) 合的基于酸 (BiFeO3) 的压陶. 虽然观察到增强的压电特性,但增加的电导率限制了它们的高温适用性.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 陶工程 陶工程 陶工程
背景情况:
- 木铁矿 (BiFeO3) 是一种具有压电性质的有前途的多铁材料.
- 高温压电陶对于先进的技术应用至关重要.
- 现有的BiFeO3陶经常面临热稳定性和性能方面的局限性.
研究的目的:
- 为了研究富含BiFeO3 (1 - (y + x)) BiFeO3-y PbTiO3-x SrTiO3散装压陶的压电特性.
- 探索这些陶在高温 (>200°C) 应用中的潜力.
- 了解 PbTiO3 和 SrTiO3 双重注对结构和压电特性的影响.
主要方法:
- 用传统的固态反应路径准备样本.
- 采用X射线衍射 (XRD) 来确认矿相纯度.
- 在各种组成和温度下测量了压电特性 (d33) 和基里温度.
主要成果:
- 与纯BiFeO3和二进制系统相比,使用PbTiO3和SrTiO3的双剂显著增强了压电特性,达到250 pC/N的d33.
- 通过双重兴奋剂,库里温度得到了大幅降低,在立方体,伪立方体和方体结构之间确定了相位边界.
- 靠近立方-伪立方相界面的优化组合表现出最高的压电响应,但高电导率限制了高温使用.
结论:
- 该BiFeO3-PbTiO3-SrTiO3系统显示了改善压电性能的潜力.
- 虽然一些组合物表现出温度稳定的压电特性,但电导率的增加仍然是高温应用的挑战.
- 需要进一步的研究,以减轻用于实际高温部署的导电性问题.
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