Giant polarization in super-tetragonal ferroelectric thin films through interphase strain

Linxing Zhang, Jun Chen, Longlong Fan, Oswaldo Diéguez, Jiangli Cao, Zhao Pan, Yilin Wang, Jinguo Wang, Moon Kim, Shiqing Deng, Jiaou Wang, Huanhua Wang, Jinxia Deng, Ranbo Yu, James Floyd Scott, Xianran Xing

Research output: Contribution to journalArticlepeer-review

88 Citations (Scopus)

Abstract

Strain engineering has emerged as a powerful tool to enhance the performance of known functional materials. Here we demonstrate a general and practical method to obtain super-tetragonality and giant polarization using interphase strain. We use this method to create an out-of-plane–to–in-plane lattice parameter ratio of 1.238 in epitaxial composite thin films of tetragonal lead titanate (PbTiO3), compared to 1.065 in bulk. These thin films with super-tetragonal structure possess a giant remanent polarization, 236.3 microcoulombs per square centimeter, which is almost twice the value of known ferroelectrics. The super-tetragonal phase is stable up to 725°C, compared to the bulk transition temperature of 490°C. The interphase-strain approach could enhance the physical properties of other functional materials.
Original languageEnglish
Pages (from-to)494-497
Number of pages4
JournalScience
Volume361
Issue number6401
DOIs
Publication statusPublished - 3 Aug 2018

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