相间
四方晶系
凝聚态物理
材料科学
极化(电化学)
薄膜
矿物学
复合材料
结晶学
化学
晶体结构
物理
纳米技术
物理化学
遗传学
生物
作者
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,J. F. Scott,Xianran Xing
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2018-08-03
卷期号:361 (6401): 494-497
被引量:185
标识
DOI:10.1126/science.aan2433
摘要
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.
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