替代对无BiFeO₃基陶的结构性,电气性质和介电放松器行为的影响

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Updated: Jul 6, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

Ibtissem Ragbaoui¹, Samia Aydi¹, Souad Chkoundali¹

¹Laboratory of Multifunctional Materials and Applications (LaMMA), LR16ES18, Faculty of Sciences, University of Sfax B. P. 1171 3000 Sfax Tunisia aydi_abdelhedi@yahoo.fr.

|January 4, 2024

概括

研究人员合成了一种新的无陶,0.7(Na0.5Bi0.5) TiO3-0.3(Bi0.7Sm0.3) FeO3,揭示了结构过渡和放松铁电行为. 这种材料显示出有前途的电特性和化学稳定性,可用于潜在的应用.

科学领域:

材料科学材料科学材料科学
固态化学固态化学
铁电工业公司铁电工业

背景情况:

基于比斯木铁酸盐 (BiFeO3) 的陶由于其独特的特性而引起了重大研究兴趣.
无陶在环保电子应用中非常受欢迎.
了解元素替代的影响对于定制陶性能至关重要.

研究的目的:

为了合成和研究一个新的无陶的结构,介电和电特性:0.7(Na0.5Bi0.5) TiO3-0.3(Bi0.7Sm0.3) FeO3.3.
探索Na,Ti和Sm替代对材料特性的影响.
为了评估这种多功能陶的潜在应用.

主要方法:

陶制备的固态合成路径.
结构分析包括相位过渡的识别 (体R3c到正体P4mm).
使用复杂阻抗,库里-韦斯,伏格尔-富尔切和德拜定律进行介电性质测量和分析.
研究电导力机制 (与氧气空缺的相关障碍跳跃).

主要成果:

成功合成了0.7(Na0.5Bi0.5) TiO3-0.3(Bi0.7Sm0.3) 的FeO3陶.
观察到结构的过渡从方形面到正方形面相.
证明了由频率依赖的电容性特征的放松铁电行为.
电导率归因于氧空缺的相关屏障跳跃 (CBH).
在铁-电相位过渡附近建立了介电和电气行为之间的相关性.

结论:

合成的无陶具有结构相变和有前途的放松铁电性质.
该材料表现出良好的电性能和化学稳定性,显示出各种应用的潜力.
这项研究提供了对受BiFeO3基陶元素替代影响的结构属性关系的见解.

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Trends in Lattice Energy: Ion Size and Charge

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process: