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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructure, enhanced electric and magnetic properties of Bi-o.9 La0.1FeO3 ceramics prepared by microwave sintering
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Microstructure, enhanced electric and magnetic properties of Bi-o.9 La0.1FeO3 ceramics prepared by microwave sintering

机译：微波烧结制备的Bi-O.9 La0.1fe3陶瓷的微观结构，增强电磁特性

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摘要

Bi0.9La0.1FeO3 (short for BLFO) ceramics was fabricated by conventional solid-state reaction and microwave sintering. Effects of microwave sintering temperature on microstructure, electric and magnetic properties have been systematically investigated. The XRD results indicate that BLFO ceramics sintered at 800 degrees C and 820 degrees C are single rhombohedral distortion perovskite phase, and there is small amount of secondary phase (Bi2Fe4O9) in the ceramic sample sintered at 780 degrees C. As microwave sintering temperature rises, the densification of BLFO ceramics enhances and the grain size increases, but the homogeneity of grain becomes worse. Microwave sintering temperature has little effect on room-temperature dielectric constant. The leakage current density decreases with the rise of sintering temperature, which is closely related to enhanced densification. The leakage mechanism of BLFO ceramics changes from bulklimited Poole-Frenkel emission to space-charge-limited bulk conduction as sintering temperature rises. The remnant polarization of BLFO ceramics sintered at 820 degrees C is much higher than that of the samples sintered at 800 degrees C and 780 degrees C, and the coercive electric field changes little with sintering temperature. The results indicate the higher sintering temperature is benefit for the ferroelectricity of BLFO ceramics. The magnetic hysteresis loops of BLFO ceramics indicate that the ceramic samples sintered at 800 degrees C and 820 degrees C show a typical ferromagnetic behavior at room temperature. Compared with BLFO ceramics sintered at 800 degrees C, the spontaneous magnetization and saturation magnetization of BLFO ceramics sintered at 820 degrees C are higher, and its remnant magnetization and coercive magnetic field are lower. (C) 2018 Elsevier B.V. All rights reserved.
机译：Bi0.9la0.1fe3（Blfo短的）陶瓷通过常规固态反应和微波烧结制造。微波烧结温度对微观结构，电和磁性的影响已得到系统地研究。 XRD结果表明，在800℃和820℃下烧结的BLFO陶瓷是单菱面膜变形钙钛矿相，并且在780℃下烧结陶瓷样品中的少量二次相（BI2Fe4O9）。随着微波烧结温度升高， BLFO陶瓷的致密化增强，晶粒尺寸增加，但谷物的均匀性变得更糟。微波烧结温度对室温介电常数几乎没有影响。随着烧结温度的升高，漏电流密度降低，与增强的致密化密切相关。 BLFO陶瓷的泄漏机理从散装温度升高时从膨胀的普尔 - Frenkel发射到空穴电荷限制散装传导。在820℃下烧结的BLFO陶瓷的残余极化远高于800℃和780℃烧结的样品的偏振，并且矫顽电场几乎没有烧结温度变化。结果表明，烧结温度较高对BLFO陶瓷的铁电性有益。 BLFO陶瓷的磁滞环表明，在800℃和820℃下烧结的陶瓷样品在室温下显示出典型的铁磁性行为。与800摄氏度烧结的BLFO陶瓷相比，在820℃下烧结的BLFO陶瓷的自发磁化和饱和磁化较高，其残余磁化和矫顽磁场较低。 （c）2018年elestvier b.v.保留所有权利。

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