应变对铁酸铋薄膜结构畸变特性的影响
Impact of strains on structural distortions in bismuth ferrite films
查看参考文献21篇
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文摘
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应变工程作为调控铁电薄膜结构及性能的重要手段一直以来是研究热点。本文通过采用不同的单晶衬底对BiFeO_3薄膜施加不同大小的拉压应变,利用像差校正透射电子显微术系统地研究了应变对BiFeO_3薄膜晶格常数、离子位移以及氧八面体旋转的影响。原子尺度高角环形暗场像(HAADF)以及环形明场像(ABF)实验表明,从拉应变过渡到压应变条件下BiFeO_3薄膜中面外晶格经历了逐渐拉长的过程。与此同时,伴随着MB—MA— MC等多种单斜相转变,薄膜中Fe~(3+)的相对位移也由拉应变下的面内离子位移大于面外离子位移逐渐转变到在压应变条件下面外离子位移明显大于面内离子位移。除此之外,随着压应变的增加,氧八面体转角逐渐减小,当BiFeO_3薄膜转变为MC相时,FeO_6的八面体结构会转变为FeO_5金字塔结构。该结果为利用应变对薄膜结构和性能进行微观调控提供了重要借鉴。 |
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其他语种文摘
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As an effective way of structural and functional manipulation in ferroelectric films,strain engineering has attracted intense interests these years. In this paper,BiFeO_3 films under various strains from tensile to compressive are grown on a series of single crystal substrates. The lattice,polarization and oxygen octahedral rotation in BiFeO_3 films under strains are investigated by using Cs-corrected transmission electron microscopy. Atomically resolved HAADF - STEM and ABF-STEM imagings reveal an increase of out-of-plane lattice spacings in BiFeO_3 films under strains from tensile to large compressive strains. Meanwhile,the out-of-plane Fe~(3+) displacements vary accordingly. Under tensile strains,the out-of-plane Fe~(3+) displacements are smaller than the in-plane displacements; Under compressive strains,the out-of-plane Fe~(3+) displacements are larger than the in-plane displacements.These variations are accompanied by the phase transitions from M_B⇒M_A⇒M_C . Moreover,the oxygen octahedral rotation angles decrease under compressive strains and the FeO_6 octahedron would change to FeO_5 square-pyramidal oxygen cages under large compressive strains. The systematic study of structural distortions in BiFeO_3 films under tensile and compressive strains provides important information for structural and functional manipulation in ferroelectric films by strain engineering. |
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来源
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电子显微学报
,2019,38(5):470-476 【扩展库】
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DOI
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10.3969/j.issn.1000-6281.2019.05.007
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关键词
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铁酸铋薄膜
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失配应变
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结构畸变
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氧八面体
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透射电子显微镜
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地址
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中国科学院金属研究所, 沈阳材料科学国家研究中心, 辽宁, 沈阳, 110016
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中国科学院大学, 北京, 100049
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中国科学技术大学, 安徽, 合肥, 230026
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兰州理工大学材料科学与工程学院, 甘肃省部共建有色金属先进加工与再利用国家重点实验室, 甘肃, 兰州, 730050
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-6281 |
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学科
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晶体学;一般工业技术;金属学与金属工艺 |
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基金
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国家自然科学基金资助项目
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中国科学院前沿局重点基础研究资助项目
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文献收藏号
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CSCD:6586826
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