Control of polarization in bulk ferroelectrics by mechanical dislocation imprint

doi:10.1126/science.abe3810

GSTDTAP > 气候变化

DOI	10.1126/science.abe3810
	Control of polarization in bulk ferroelectrics by mechanical dislocation imprint
	Marion Höfling; Xiandong Zhou; Lukas M. Riemer; Enrico Bruder; Binzhi Liu; Lin Zhou; Pedro B. Groszewicz; Fangping Zhuo; Bai-Xiang Xu; Karsten Durst; Xiaoli Tan; Dragan Damjanovic; Jurij Koruza; Jürgen Rödel
	2021-05-28
发表期刊	Science
出版年	2021
英文摘要	Dislocations can be problematic for the properties of functional oxides and are often avoided as a result. Höfling et al. found that introducing a network of dislocations to barium titanate actually enhanced the dielectric and piezoelectric properties. The authors introduced the dislocation network with uniaxial compression, which forced the material to have a domain structure that enhanced the piezoelectric coefficient by a factor of 19. This strategy should be a useful tool for optimizing properties of other functional oxides. Science , abe3810, this issue p. [961][1] Defects are essential to engineering the properties of functional materials ranging from semiconductors and superconductors to ferroics. Whereas point defects have been widely exploited, dislocations are commonly viewed as problematic for functional materials and not as a microstructural tool. We developed a method for mechanically imprinting dislocation networks that favorably skew the domain structure in bulk ferroelectrics and thereby tame the large switching polarization and make it available for functional harvesting. The resulting microstructure yields a strong mechanical restoring force to revert electric field–induced domain wall displacement on the macroscopic level and high pinning force on the local level. This induces a giant increase of the dielectric and electromechanical response at intermediate electric fields in barium titanate [electric field–dependent permittivity (ε33) ≈ 5800 and large-signal piezoelectric coefficient ( d 33*) ≈ 1890 picometers/volt]. Dislocation-based anisotropy delivers a different suite of tools with which to tailor functional materials. [1]: /lookup/doi/10.1126/science.abe3810
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/328866
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Marion Höfling,Xiandong Zhou,Lukas M. Riemer,et al. Control of polarization in bulk ferroelectrics by mechanical dislocation imprint[J]. Science,2021.
APA	Marion Höfling.,Xiandong Zhou.,Lukas M. Riemer.,Enrico Bruder.,Binzhi Liu.,...&Jürgen Rödel.(2021).Control of polarization in bulk ferroelectrics by mechanical dislocation imprint.Science.
MLA	Marion Höfling,et al."Control of polarization in bulk ferroelectrics by mechanical dislocation imprint".Science (2021).