Local insight into the La-induced structural phase transition in multiferroic BiFeO3 ceramics by X-ray absorption fine structure spectroscopy
Local insight into the La-induced structural phase transition in multiferroic BiFeO3 ceramics by X-ray absorption fine structure spectroscopy
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通过 X 射线吸收精细结构光谱局部洞察多铁 BiFeO3 陶瓷中 La 诱导的结构相变
DOI：
10.1088/1361-648x/aaf658
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发表时间：
2019-01
期刊：
影响因子：
--
通讯作者：
Chen Dongliang
中科院分区：
文献类型：
--
作者：
Dong Juncai;Zhang Xiaoli;Wang Yan;Gong Yu;An Pengfei;Li Haijing;Guo Zhiying;Hao Xinyu;Jia Quanjie;Chen Dongliang
稀土离子取代铋对室温BiFeO 3基多铁性材料的发展具有重要的技术意义。尽管这种兴趣，许多基本属性和RE掺杂的BiFeO 3的结构-属性的相关性仍然知之甚少。本文对Bi_（1-x）La_xFeO_3（0 ≤ x ≤ 0.2）陶瓷的结构相变进行了系统的实验和理论研究。通过X射线吸收精细结构谱，我们首次发现在所有La 3+掺杂浓度（0.001 ≤ x ≤ 0.2）下，La 3+掺杂实际上取代了具有正交Pbam对称性的二级纳米颗粒的Bi位，而不是长期以来认为的母体菱形R3 c相。这种均匀混合的两相化合物不能通过X射线衍射检测，直到La含量接近x = 0.2。这一发现得到了透射电子显微镜和热力学偏好的补充研究的进一步支持，并且它对当x ≤ 0.1时La 3+取代R3 c结构中Bi 3+位置的流行假设以及先前提出的基于准同型相界的增强功能性质的起源提出了严重挑战。这一新的见解可能会点燃复兴探索基础的多铁性机制BiFeO 3基材料，并促进自下而上的设计新的多功能器件。
Substitution of bismuth by rare-earth (RE) ions is of great technological importance to develop room-temperature BiFeO3-based multiferroic materials. Despite this interest, many fundamental properties and the structure-property correlations of RE-doped BiFeO3 remain poorly understood. Here we report a systematical experimental and theoretical exploration on the structural phase transition in Bi1-xLaxFeO3 (0 ≤ x ≤ 0.2) ceramics. By using x-ray absorption fine structure spectroscopy, we for the first time show that the La3+ dopants in fact substitute the Bi site of a secondary nanosized particles with orthorhombic Pbam symmetry instead of the long-believed parental rhombohedral R3c phase at all La3+ doping concentrations (0.001 ≤ x ≤ 0.2). This homogeneously mixed two-phase compound cannot be detected by the x-ray diffraction until La content approaching x = 0.2. The finding is further supported by complementary studies of transmission electron microscopy and thermodynamic preference, and it casts serious challenges on the prevailing assumption of La3+ substitution on the Bi3+ site in R3c structure when x ≤ 0.1 as well as the previously proposed origin of enhanced functional properties based on morphotropic phase boundary. This new insight may ignite a revival on exploring the underlying multiferroic mechanisms in BiFeO3-based materials and facilitate the bottom-up design of novel multifunctional devices.
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影响因子：
6.2
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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