Effects of Co Concentration on Structure and Thermoelectric Properties of PrBa2(Cu1-xCox)3O7-y Ceramics

IF 0.6 4区综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES

Chiang Mai Journal of Science Pub Date : 2024-07-31 DOI:10.12982/cmjs.2024.066

Marisa Takong, Benjarath Waytathum, P. Wannasut, A. Watcharapasorn

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Abstract

This work aims to study the effects of Co-doping in Cu-site of PrBa2(Cu1-xCox)3O7-y (PrBCO) ceramics (where x = 0.05, 0.10, 0.15, 0.17 and 0.20) on thermoelectric (TE) properties at high temperature. The result of solid-state reaction synthesis of Co-doped PrBCO compounds was optimally obtained at 900 °C for 16 h. Then, the powder was compacted into pellets by uniaxial press and sintered at 920 °C for 16 h and the crystalline structure was confirmed using X-ray diffractometry (XRD). The XRD data underwent Rietveld refinement employing the GSAS II program for a detailed analysis of phase composition and crystal structure. Microstructural characteristics and chemical composition were investigated through scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), respectively. The high-temperature thermoelectric properties, particularly electrical conductivity (), Seebeck coefficient () and thermal conductivity (ĸ) were also measured, and the figure of merit (ZT) was calculated to determine the thermoelectric performance of the compounds. The measured bulk density, determined through air and xylene displacement exceeded 90% of theoretical value. It was observed that Co-doping in the Cu-site of PrBCO led to an increased value of the Seebeck coefficient (), resulting in the ZT value tending to increase, particularly as the temperature rised. However, the electrical conductivity (σ) decreased, which was inversely related to  due to the reduction in carrier concentration. The power factor (PF) showed relatively high values over a broad temperature range for undoped and x=0.05 Co-doped samples. Furthermore, considering the thermal conductivity (κ), it was found that κ decreased after Co was added to PrBCO, due to the lattice structure being disturbed and causing increased phonon scattering. The sample with x = 0.05 exhibited the highest ZT value of 0.028 at 873 K, while the sample with x = 0.17 had the highest ZT value of 0.021 at 673 K.

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钴浓度对 PrBa2（Cu1-xCox）3O7-y 陶瓷结构和热电性能的影响

这项工作旨在研究在 PrBa2(Cu1-xCox)3O7-y（PrBCO）陶瓷（其中 x = 0.05、0.10、0.15、0.17 和 0.20）的铜位掺杂 Co 对高温热电特性的影响。掺 Co 的 PrBCO 化合物在 900 ℃、16 小时的固态反应合成过程中获得了最佳结果，然后用单轴压力机将粉末压制成颗粒，并在 920 ℃、16 小时的烧结过程中使用 X 射线衍射仪（XRD）确认了结晶结构。利用 GSAS II 程序对 XRD 数据进行了里特维尔德细化，以详细分析相组成和晶体结构。扫描电子显微镜（SEM）和能量色散 X 射线光谱（EDS）分别对微观结构特征和化学成分进行了研究。此外，还测量了高温热电性能，特别是电导率（）、塞贝克系数（）和热导率（ĸ），并计算了优点系数（ZT），以确定化合物的热电性能。通过空气和二甲苯置换测定的体积密度超过了理论值的 90%。据观察，在 PrBCO 的铜位掺入 Co 会导致塞贝克系数 () 增加，从而使 ZT 值趋于增加，尤其是当温度升高时。然而，由于载流子浓度降低，电导率（σ）下降，与  成反比。在较宽的温度范围内，未掺杂和 x=0.05 Co 掺杂样品的功率因数（PF）显示出相对较高的值。此外，考虑到热导率 (κ)，发现在 PrBCO 中添加 Co 后，κ 会降低，这是由于晶格结构受到干扰，导致声子散射增加。x = 0.05 的样品在 873 K 时的 ZT 值最高，为 0.028，而 x = 0.17 的样品在 673 K 时的 ZT 值最高，为 0.021。

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来源期刊

Chiang Mai Journal of Science MULTIDISCIPLINARY SCIENCES-

CiteScore

1.00

自引率

25.00%

发文量

103

审稿时长

3 months

期刊介绍： The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so.

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