Modeling the paraelectric aging effect in the acceptor doped perovskite ferroelectrics: role of oxygen vacancy
Modeling the paraelectric aging effect in the acceptor doped perovskite ferroelectrics: role of oxygen vacancy
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DOI：
10.1088/0953-8984/25/43/435901
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
Yumei Zhou;D. Xue;Xiangdong Ding;Lixue Zhang;Jun Sun;X. Ren
中科院分区：
文献类型：
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作者：
Yumei Zhou;D. Xue;Xiangdong Ding;Lixue Zhang;Jun Sun;X. Ren
最近在Mn 3+掺杂的（Ba0.8Sr0.2）TiO 3陶瓷中探测了顺电相的物理性质的时间依赖性，提供了一个简单的情况（没有自发极化或畴壁）来量化老化过程中氧空位的作用。在本研究中，我们提出了一个定量模型的顺电老化，以了解如何分布的氧空位随时间的演变，从而影响顺电相的介电响应。首先，通过比较Mn ~（3+）掺杂（Ba_（0.75）Sr_（0.25））TiO_3陶瓷顺电老化的介电行为和介电调谐效应，发现顺电相中存在与氧空位有关的内偏场Ein。其次，通过在Landau型模型中引入这种随时间变化的Ein，我们再现了Mn 3+掺杂的（Ba 0.8Sr 0.2）TiO 3陶瓷在顺电老化过程中的介电响应。结果表明，介电常数的增加可以归因于Ein随时间的减少。顺电老化的研究有助于理解氧空位对铁电材料物理性能的影响。
The time dependence of physical properties in the paraelectric phase was probed recently in a Mn3+ doped (Ba0.8Sr0.2)TiO3 ceramic, providing a simple situation (without spontaneous polarization or domain walls) to quantify the role of the oxygen vacancy during aging. In the present study, we propose a quantitative model for paraelectric aging to understand how the distribution of the oxygen vacancy evolves with time and consequently influences the dielectric response of the paraelectric phase. First, by comparing dielectric behavior of paraelectric aging in a Mn3+ doped (Ba0.75Sr0.25)TiO3 ceramic and the dielectric tunable effect, an internal bias field Ein related to the oxygen vacancy is shown to exist in the paraelectric phase. Second, by introducing such a time dependent Ein in a Landau-type model, we reproduce the dielectric response of Mn3+ doped (Ba0.8Sr0.2)TiO3 ceramic during paraelectric aging. It is suggested that the increase of dielectric permittivity can be ascribed to the decrease of Ein with time. The investigation of paraelectric aging is helpful for understanding the role of the oxygen vacancy in influencing the physical properties of ferroelectric materials.