Reactive Templated Grain Growth and Thermoelectric Power Factor Enhancement of Textured CuFeO2 Ceramics
Reactive Templated Grain Growth and Thermoelectric Power Factor Enhancement of Textured CuFeO2 Ceramics
复制标题
DOI：
10.1021/acsaem.9b02407
复制
发表时间：
2020-02
期刊：
影响因子：
--
通讯作者：
M. Tato;Rina Shimonishi;M. Hagiwara;S. Fujihara
中科院分区：
文献类型：
--
作者：
M. Tato;Rina Shimonishi;M. Hagiwara;S. Fujihara
铜铁矿型CuFeO 2（CFO）是一种很有前途的p型热电氧化物，具有较大的Seebeck系数，但由于缺乏织构化方法，限制了其热电性能。在这里，我们表明，纹理CFO陶瓷具有增强的热电功率因数，可以通过一个简单的过程的基础上的反应模板晶粒生长（RTGG）方法。采用水热法合成了α-FeOOH纳米棒，并将其用作RTGG过程的模板。将α-FeOOH纳米棒和Cu 2 O颗粒混合粉末经顺序单轴压制和随后的反应烧结工艺制备了具有高c轴取向的织构CFO陶瓷。在1020 °C的烧结温度下，获得了最高取向度（Lotgering因子）为0.71的最佳CFO陶瓷。结果表明，通过α-Fe_2O_3中间相的拓扑转化过程，可形成织构化的CFO陶瓷。织构化的CFO陶瓷显示出较高的面内电阻率。
The delafossite-type CuFeO2 (CFO) is a promising p-type thermoelectric oxide reported to show a large Seebeck coefficient, but the lack of a texturing method for CFO ceramics limits their thermoelectric performance. Here, we show that textured CFO ceramics with an enhanced thermoelectric power factor can be obtained by a facile process based on the reactive templated grain growth (RTGG) method. Nanorods of α-FeOOH were synthesized by a hydrothermal reaction and used as templates for the RTGG process. Textured CFO ceramics with a high c-axis orientation were obtained by ordinal uniaxial pressing of a mixed powder of the α-FeOOH nanorods and Cu2O particles and subsequent reaction sintering process. The best CFO ceramic with the highest orientation degree (Lotgering factor) of 0.71 was obtained at a sintering temperature of 1020 °C. It was found that textured CFO ceramics were formed through a topotactic conversion process via an intermediate α-Fe2O3 phase. The textured CFO ceramic showed a high in-plane ele...