期刊
ADVANCED ELECTRONIC MATERIALS
卷 2, 期 1, 页码 -出版社
WILEY
DOI: 10.1002/aelm.201500196
关键词
-
资金
- National Science Foundation under MRSEC grant [DMR-1420620]
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- Japan Society for the Promotion of Science for Research Abroad [25-185]
- National Science Foundation Graduate Fellowship grant [DGE-1255832]
- JSPS KAKENHI [26106514]
- [DMR-1210588]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1210588] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [26106514] Funding Source: KAKEN
An improper mechanism for breaking inversion symmetry is revealed and thus inducing piezoelectricity in the family of layered perovskites, LiRTiO4 (R = rare earths), which are previously reported as centrosymmetric. Noncentrosymmetry in this family of compounds arises from TiO6 octahedral rotation represented by a(-)b(o)c(o)/b(o)a(-)c(o) in the perovskite blocks between RO rock salt and LiO antifl uorite layers. X-ray diffraction and optical second harmonic generation complemented by density functional theory predictions are crucial in determining the new structures. High transition temperature (T-ac) of up to 1200 K from noncentrosymmetric to centrosymmetric phase is observed. Piezoelectric coefficients (d(36)) of up to -15 pC/N are predicted, and piezoelectric force microscopy experiments confirm a piezoelectric response. The demonstrated improper mechanism in this and other layered oxide families, with a wide range of available topologies and chemistries, could aid in the search for high temperature piezoelectrics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据