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首页> 外文期刊>RSC Advances >Sintering behavior and thermoelectric properties of LaCoO3 ceramics with Bi2O3-B2O3-SiO2 as a sintering aid
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Sintering behavior and thermoelectric properties of LaCoO3 ceramics with Bi2O3-B2O3-SiO2 as a sintering aid

机译：以Bi2O3-B2O3-SiO2为烧结助剂的LaCoO3陶瓷的烧结行为和热电性能

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Recently, LaCoO3 has received increasing attention as a promising thermoelectric oxide. However, its sintering temperature is too high from the practical point of view. This study investigated the effect of Bi2O3-B2O3-SiO2 (BBS) as a sintering aid on the low-temperature sintering behaviors, microstructures and thermoelectric properties of LaCoO3 ceramics. The XRD results revealed that the LaCoO3 ceramics with 1-3 wt% BBS could form a single crystalline phase without visible secondary phases. The sintering temperature of LaCoO3 ceramics was reduced remarkably from 1200 degrees C to 950 degrees C by adding 3 wt% BBS, with a relative density higher than 95%. The process of densification and the appearance of rod-like grains in LaCoO3 with BBS aids were observed by SEM. Meanwhile, the thermoelectric properties of LaCoO3 ceramics were strongly dependent on the densification and microstructures. For the samples sintered at 1050 degrees C, the electrical conductivity increased significantly with the increase of BBS content (x, wt%) up to x = 2.0, and the Seebeck coefficients were almost the same when the test temperatures were higher than 200 degrees C. Moreover, the sample with x = 2.0 had the optimum thermoelectric properties with ZT - 0.05 at 400 degrees C, which was about 66.7% higher than that of pure LaCoO3 ceramics sintered at 1200 degrees C, indicating that the addition of BBS could effectively promote the densification and further improve thermoelectric properties of LaCoO3 ceramics without using complicated processes.
机译：最近，LaCoO3作为一种有前途的热电氧化物受到越来越多的关注。但是，从实用的角度看，其烧结温度太高。这项研究调查了Bi2O3-B2O3-SiO2（BBS）作为烧结助剂对LaCoO3陶瓷的低温烧结行为，微观结构和热电性能的影响。 XRD结果表明，含1-3 wt％BBS的LaCoO3陶瓷可以形成单晶相而没有可见的第二相。通过添加3％（重量）的BBS，相对密度高于95％，LaCoO3陶瓷的烧结温度从1200摄氏度显着降低到950摄氏度。用SEM观察了LaCoO3中BBS助剂的致密化过程和棒状晶粒的出现。同时，LaCoO3陶瓷的热电性能强烈依赖于致密化和微观结构。对于1050℃烧结的样品，随着BBS含量（x，wt％）的增加，x = 2.0时，电导率显着增加，并且当测试温度高于200℃时，塞贝克系数几乎相同。此外，x = 2.0的样品在400℃时具有最佳ZT-0.05的热电性能，比在1200℃下烧结的纯LaCoO3陶瓷高约66.7％，表明添加BBS可以有效地促进LaCoO3陶瓷的致密化并进一步提高其热电性能，而无需使用复杂的过程。

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