Artificial design for new ferroelectrics using nanosheet-architectonics concept
Artificial design for new ferroelectrics using nanosheet-architectonics concept
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DOI：
10.1088/0957-4484/26/24/244001
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发表时间：
2015-06
期刊：
影响因子：
3.5
通讯作者：
Yoonhyun Kim;Lei Dong;M. Osada;B. Li;Y. Ebina;T. Sasaki
中科院分区：
文献类型：
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作者：
Yoonhyun Kim;Lei Dong;M. Osada;B. Li;Y. Ebina;T. Sasaki
控制铁电有序的出现仍然是合理设计具有新特性的人工材料的基本挑战。在这里，我们报告了一种新的策略，人工设计的层状钙钛矿铁电体，通过使用氧化物纳米片（高k介电Ca 2Nb 3 O 10和绝缘Ti0.87O2）作为积木。我们采用Langmuir-Blodgett沉积法制备超晶格薄膜。人工制备的（Ti0.87O2/Ca 2Nb 3 O 10）2（Ti0.87O2）超晶格在结构上是独特的，这不可能以块体形式产生。通过这种人工结构化，我们发现（Ti0.87O2/Ca 2Nb 3 O 10）2（Ti0.87O2）超晶格具有一种新的界面耦合形式，从而产生具有良好抗疲劳特性的铁电性。考虑到自组装纳米片界面的灵活性，该技术提供了一种合成新型层状铁电氧化物的途径。
Control over the emergence of ferroelectric order remains a fundamental challenge for the rational design of artificial materials with novel properties. Here we report a new strategy for artificial design of layered perovskite ferroelectrics by using oxide nanosheets (high-k dielectric Ca2Nb3O10 and insulating Ti0.87O2) as a building block. We approached the preparation of superlattice films by a layer-by-layer assembly involving Langmuir–Blodgett deposition. The artificially fabricated (Ti0.87O2/Ca2Nb3O10)2(Ti0.87O2) superlattices are structurally unique, which is not feasible to create in the bulk form. By such an artificial structuring, we found that (Ti0.87O2/Ca2Nb3O10)2(Ti0.87O2) superlattices possess a new form of interface coupling, which gives rise to ferroelectricity with a good fatigue-free characteristic. Considering the flexibility of self-assembled nanosheet interfaces, this technique provides a route to synthesize a new kind of layered ferroelectric oxides.