共查询到18条相似文献,搜索用时 109 毫秒
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基于热电薄膜的微型热电器件在微区制冷、温差发电等领域具有广阔应用前景。具有高功率因子、ZT值的热电薄膜对微型热电器件的性能至关重要。Sb_(2)Te_(3)基材料是室温下性能优异的p型热电材料。然而,目前Sb_(2)Te_(3)基薄膜的热电性能仍然不能满足实际应用的需求。简述了热电材料研究的相关背景,介绍了Sb_(2)Te_(3)的晶体结构,概述了Sb_(2)Te_(3)基薄膜的常用制备技术,从提高功率因子和降低热导率2方面综述了提高Sb_(2)Te_(3)基薄膜热电性能的方法。重点介绍了材料组织、微观结构与热电性能的关系,即缺陷、择优取向、纳米颗粒、超晶格、有机无机杂化等对Sb_(2)Te_(3)基薄膜热电性能的影响。此外,对Sb_(2)Te_(3)基热电薄膜的发展方向予以展望。 相似文献
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钴基氧化物热电陶瓷的研究进展 总被引:1,自引:0,他引:1
随着可开发性能源的日益减少和环境污染问题的日趋严重,热电陶瓷作为一种能够实现热能和电能之间直接转换的功能陶瓷,其研究越来越受到重视。层状钴基氧化物由于具有优良的性能而成为有着广阔应用前景的一种热电陶瓷材料。本文回顾了热电材料的发展历史,阐述了与热电转换相关的一些理论基础以及良好热电材料所需具备的条件,指出钴基氧化物所存在的各种优缺点,并着重介绍了几种常见的钴基氧化物热电陶瓷材料的基本结构、性能特征与研究进展等, 相似文献
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Aikaterini Teknetzi Evangelia Tarani Elli Symeou Dimitrios Karfaridis Dimitrios Stathokostopoulos Eleni Pavlidou Theodora Kyratsi Evripidis Hatzikraniotis Konstantinos Chrissafis George Vourlias 《Ceramics International》2021,47(1):243-251
Higher manganese silicides (HMS) are promising alternative materials for middle to high temperature thermoelectric applications as a low-cost, non-toxic and highly stable p-type leg. Many of the preparation methods that have been reported previously require long-time and energy consuming processes, as well as expensive equipment, and often do not result in a material of sufficient quality. In this study, the simple, cost-effective and eco-friendly technique of pack cementation is applied. HMS powders synthesized at different experimental conditions are studied and compared considering their structure, composition, short-term thermal stability in air and thermoelectric properties. X-ray diffraction analysis, X-ray photoelectron spectroscopy, scanning electron microscopy, thermogravimetry and thermoelectric measurements (in terms of Seebeck coefficient, electrical and thermal conductivity) were employed for the characterization of the material and evaluation of its performance. All samples were identified as HMS and only some negligible traces of MnSi were detected. They moderately oxidize when heated non-isothermally under air atmosphere up to 1473 K, while the presence of HMS remains dominant even at such high temperatures. Their thermoelectric properties were remarkable for an undoped material, with a maximum figure of merit (ZT) of 0.47 at 777 K. Pack cementation appeared to have a great potential as the synthesis route of high-efficiency HMS. 相似文献
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提高冷热两端温度是提高热电器件发电效率的有效途径之一。但当施加于热端表面的热通量不均匀时,热端表面温度不均匀,系统性能受到影响。基于此,建立了热电器件的热电转换耦合数学模型,分析热电材料物性参数,非均匀热通量等参数对热电器件的功率输出特性的影响。数值模拟结果表明:材料物性参数随温度的变化对系统输出功率的影响不可忽略,热通量4 W·cm-2时物性参数对系统最高温度的影响接近4%;非均匀热通量对热电器件输出特性影响也十分显著,热通量均匀度越小,热端表面温度分布不均匀性越大,极值温度越高,高温区越小,断路电压越低。 相似文献
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F. A. Ibrahim 《SILICON》2018,10(1):131-136
A sol–gel method (colloidal route) based on V2O5.nH2O hydrogel was developed to synthesize xFeCl3-(80-x)V2O5-20MoO3.nH2O (0.5 ≤ x ≤ 3 mol.%) material. X-ray diffraction (XRD), transmission electron microscopy (TEM), density, thermoelectric power, and electrical properties of the films as prepared were investigated. X-ray diffraction and transmission electron microscopy were used to identify the structure of the obtained nanocrystals. Homogenous nanocrystals of 40 nm in size were obtained. Electrical conductivity and thermoelectric power were measured in the temperature range 385–500 K for the as-prepared films. The electrical conductivity increased with increasing FeCl3content. The obtained results showed by increasing FeCl3content in the system under investigation, gradual changes in thermoelectric power from n-type to p-type were detected. The sol–gel method is fit for the preparation of x FeCl3-(80-x)V2O5-20MoO3.nH2O material which may offer some favorable properties for commercial application. 相似文献
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In order to explain the unique thermoelectric properties of bulk nanocomposite p-type bismuth antimony telluride, its structural and electrical properties are investigated using transmission electron microscopy (TEM) and atomic force microscopy with a conductive probe (C-AFM). The material is observed to contain both nano- and micro-sized grains with sizes varying from 10 nm to 3 μm. This unique structure promotes phonon scattering, thereby decreasing the thermal conductivity to below 1 W mK(-1) at room temperature. Moreover, the C-AFM data show that the electrical conductivity of nanosized grains is higher than the bulk value and reaches 1600 S cm(-1). This results in a moderate increment of the overall electrical conductivity, thereby increasing the figure of merit (ZT) up to 1.4 at 100 °C. In addition to demonstrating a powerful scanning probe microscopy (SPM) based investigation technique that requires minimal sample preparation, our findings contribute towards better understanding of the enhancement of thermoelectric properties of nanocomposite thermoelectric materials. 相似文献