Bi₁₋ₓSmₓFeO₃纳米粉体的巨介电响应
A colossal dielectric response of Bi1-xSmxFeO3 nanopowders
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中文总结 AI 辅助
本文研究不同Sm掺杂量的Bi₁₋ₓSmₓFeO₃纳米粉体的介电响应，发现其在特定温度区间呈现巨介电效应，通过分析相变与界面效应解释该现象，理论模拟验证了实验趋势。
中文摘要 AI 辅助
本文研究了Sm含量x在0至0.2范围内的Bi₁₋ₓSmₓFeO₃压片粉体样品的介电常数，测试温度范围为20℃至400℃，频率范围为100Hz至100kHz。研究表明，Sm含量对有效介电常数的实部和虚部有显著影响，在300K至400K温度区间，二者呈现出扩展的弥散型极大值，实部的巨幅值可达10⁵，虚部可达10⁸。对实验数据的分析显示，有效介电常数的实部和虚部可通过弥散型铁电-顺电相变与麦克斯韦-瓦格纳-西尔斯效应的复杂相互作用得到全面解释，该效应源于纳米晶界间界面及铁电纳米颗粒-空气界面处空间电荷的形成。采用有效介质方法处理有效介电常数实部和虚部的实验数据，可分离并分析纳米颗粒本身的巨介电响应。实验得出的主要趋势得到了理论模拟依赖关系的支持，模拟揭示了介电性能的温度行为与Bi₁₋ₓSmₓFeO₃纳米颗粒相态之间的关联。
英文摘要
The dielectric permittivity of the pressed powder samples of Bi1-xSmxFeO3, with Sm content "x" varying in the range 0 - 0.2, has been investigated in the temperature range from 20 to 400 C and the frequency range from 100 Hz to 100 kHz. We have shown that the Sm content impacts significantly the real and imaginary parts of effective dielectric permittivity, which have expanded diffuse maxima with a colossal magnitude up to 105 (for the real part) and up to 108 (for the imaginary one) at temperatures 300 - 400 K. Analysis of experimental data carried has shown that both the real and imaginary parts of effective dielectric permittivity may be comprehensively explained by considering a complex interplay of a diffuse ferroelectric-paraelectric phase transition and the Maxwell-Wagner-Sillars effects, which emerge from the formation of spatial charges at interfaces between nanograins and at the ferroelectric nanoparticle-air interface. Processing of experimental data for the real and imaginary parts of the effective dielectric permittivity within effective medium approach allows us to separate and analyze the colossal dielectric response of the nanoparticles itself. The main trends followed from experiments are supported by the theoretically simulated dependences, which reveal correlations between the temperature behavior of dielectric properties and phase state of the Bi1-xSmxFeO3 nanoparticles.
发表机构
- Institute of Physics, National Academy of Sciences of Ukraine（乌克兰国家科学院物理研究所）
- Taras Shevchenko National University of Kyiv（基辅塔拉斯舍甫琴科国立大学）
- Stockholm University, Department of Chemistry（斯德哥尔摩大学化学系）
- University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”（乌克兰伊戈尔·西科尔斯基基辅理工学院）
- Frantsevich Institute for Problems in Materials Science of the National Academy of Sciences of Ukraine（乌克兰国家科学院弗朗采维奇材料科学问题研究所）
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