Effect of oxygen deficiency on mechanical and thermo-mechanical properties of ferroic La0.6Sr0.4Co0.2Fe0.8O3-δ
Effect of oxygen deficiency on mechanical and thermo-mechanical properties of ferroic La0.6Sr0.4Co0.2Fe0.8O3-δ
复制标题
缺氧对铁质La0.6Sr0.4Co0.2Fe0.8O3-δ力学和热机械性能的影响
DOI：
10.1002/adem.202101204
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发表时间：
2022
影响因子：
3.6
通讯作者：
and Yoshio Arai.
中科院分区：
文献类型：
--
作者：
Wakako Araki;Keiyu Ikeda;Naoto Otomo;Yoshiki Nakazato;Shota Yokoyama;and Yoshio Arai.
研究了不同氧非化学计量比的铁相La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF)在室温下的力学行为和热机械行为。通过比较空气和Ar气氛中的LSCF，讨论了氧缺乏对这些行为的影响。X-射线衍射分析和扫描电子显微镜观察表明，氧空位的形成减少了晶格中的菱面体扭曲，导致LSCF铁磁区的消失。高温电导率测量证实，在Ar中退火的LSCF比在空气中退火的LSCF具有更高的氧非化学计量比。热机械分析和单轴压缩实验表明，氧空位的引入可以显著影响LSCF的铁磁性和铁弹性等铁性特性，而本征晶格稳定性保持不变。
The mechanical and thermomechanical behaviors of ferroic La0.6Sr0.4Co0.2Fe0.8O3–δ(LSCF) with different oxygen nonstoichiometries are investigated around room temperature. The effects of oxygen deficiency on these behaviors are discussed by comparing LSCFs annealed in air and Ar. X‐ray diffraction analysis and the scanning electron microscopy observation demonstrate that the formation of oxygen vacancy reduces the rhombohedral distortion in the lattice, resulting in the disappearance of ferroic domains of LSCF. The measurements of electrical conductivity at high temperatures confirm that LSCF annealed in Ar has a higher oxygen nonstoichiometry than the one annealed in air. The thermomechanical analysis and the uniaxial compression test reveal that the introduction of oxygen vacancies can significantly influence the ferroic characteristics of LSCF such as ferromagnetism and ferroelasticity, whereas the intrinsic lattice stability would remain unchanged.