Muhammad Waqas, Abdul Shakoor, Muhammad Nadeem, Ghazi Aman Nowsherwan, Ahmar Ali, Muhammad Fasih Aamir, Shahbaz Younas Bhatti, Ahmed Bilal, Anis Ur Rehman
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DC electrical measurements showed increasing conductivity with temperature. AC electrical analysis demonstrated frequency-dependent behavior with increasing AC conductivity and decreasing loss factor and dielectric constants. Seebeck coefficient measurements exhibited temperature-dependent behavior. Thermal transport properties showed increasing thermal conductivity and volumetric specific heat with temperature, while thermal diffusivity decreased. The composition Bi 1.9 La 0.1 Te 3 with x = 0.1 doping displayed lower thermal conductivity, higher electrical conductivity, and a higher ZT value, making it more suitable for thermoelectric applications. Furthermore, the sample Bi 1.8 La 0.2 Te 3 exhibited favorable characteristics for energy storage applications compared to the other samples. 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The composition Bi 1.9 La 0.1 Te 3 with x = 0.1 doping displayed lower thermal conductivity, higher electrical conductivity, and a higher ZT value, making it more suitable for thermoelectric applications. Furthermore, the sample Bi 1.8 La 0.2 Te 3 exhibited favorable characteristics for energy storage applications compared to the other samples. 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引用次数: 0
摘要
摘要:热电技术是可再生能源领域的新兴技术,掺杂材料的探索为提高热电材料的性能开辟了新的途径。采用WOWS溶胶-凝胶法合成了成分为Bi 2−x La x Te 3 (x = 0.0, 0.1, 0.2, 0.3, 0.4)的La掺杂热电材料,并在500℃下烧结5 h。x射线衍射分析证实了其晶格常数为a = b = 4.41(2) Å和C = 29.81(3) Å的菱形晶体结构。扫描电镜显示颗粒状(0.7 ~ 2.5 μm)。傅里叶变换红外光谱证实了样品的单相性质。直流电测量显示电导率随温度升高而增加。交流电学分析表明,随着交流电导率的增加,损耗因子和介电常数的降低,频率依赖性增强。塞贝克系数测量显示出温度依赖行为。热输运性能随温度升高,导热系数和体积比热增大,而热扩散系数减小。掺杂x = 0.1的Bi 1.9 La 0.1 Te 3具有较低的导热系数、较高的导电性和较高的ZT值,更适合热电应用。此外,与其他样品相比,样品Bi 1.8 La 0.2 Te 3表现出良好的储能特性。这些发现为la掺杂碲化铋化合物在热电和储能系统中的潜在应用提供了见解。
Unveiling transport properties in rare-earth-substituted nanostructured bismuth telluride for thermoelectric application
Abstract Thermoelectrics is an emerging technology in the field of renewable energy sources, and the exploration of doped materials has opened up new avenues for enhancing their performance. La-doped thermoelectric materials with the composition Bi 2− x La x Te 3 ( x = 0.0, 0.1, 0.2, 0.3, 0.4) were synthesized using the WOWS sol–gel method and sintered at 500 °C for 5 h. X-ray diffraction analysis confirmed a rhombohedral crystal structure with lattice constants of a = b = 4.41(2) Å and c = 29.81(3) Å. Scanning electron microscopy revealed particle-like shapes (0.7–2.5 μm). Fourier transform infrared spectroscopy confirmed the single-phase nature of the samples. DC electrical measurements showed increasing conductivity with temperature. AC electrical analysis demonstrated frequency-dependent behavior with increasing AC conductivity and decreasing loss factor and dielectric constants. Seebeck coefficient measurements exhibited temperature-dependent behavior. Thermal transport properties showed increasing thermal conductivity and volumetric specific heat with temperature, while thermal diffusivity decreased. The composition Bi 1.9 La 0.1 Te 3 with x = 0.1 doping displayed lower thermal conductivity, higher electrical conductivity, and a higher ZT value, making it more suitable for thermoelectric applications. Furthermore, the sample Bi 1.8 La 0.2 Te 3 exhibited favorable characteristics for energy storage applications compared to the other samples. These findings provide insights into the potential applications of La-doped bismuth telluride compounds in thermoelectric and energy storage systems.
期刊介绍:
A Journal of Physical Sciences: Zeitschrift für Naturforschung A (ZNA) is an international scientific journal which publishes original research papers from all areas of experimental and theoretical physics. Authors are encouraged to pay particular attention to a clear exposition of their respective subject, addressing a wide readership. In accordance with the name of our journal, which means “Journal for Natural Sciences”, manuscripts submitted to ZNA should have a tangible connection to actual physical phenomena. In particular, we welcome experiment-oriented contributions.