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首页> 外文期刊>Advanced Functional Materials >Employing Interfaces with Metavalently Bonded Materials for Phonon Scattering and Control of the Thermal Conductivity in TAGS-x Thermoelectric Materials
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Employing Interfaces with Metavalently Bonded Materials for Phonon Scattering and Control of the Thermal Conductivity in TAGS-x Thermoelectric Materials

机译：使用介价键材料的界面进行声子散射和TAGS-x热电材料中的导热率控制

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摘要

The thermoelectric compound (GeTe)(x)(AgSbTe2)(1-)(x), in short (TAGS-x), is investigated with a focus on two stoichiometries, i.e., TAGS-50 and TAGS-85. TAGS-85 is currently one of the most studied thermoelectric materials with great potential for thermoelectric applications. Yet, surprisingly, the lowest thermal conductivity is measured for TAGS-50, instead of TAGS-85. To explain this unexpected observation, atom probe tomography (APT) measurements are conducted on both samples, revealing clusters of various compositions and sizes. The most important role is attributed to Ag2Te nanoprecipitates (NPs) found in TAGS-50. In contrast to the Ag2Te NPs, the matrix reveals an unconventional bond breaking mechanism. More specifically, a high probability of multiple events (PME) of approximate to 60% is observed for the matrix by APT. Surprisingly, the PME value decreases abruptly to approximate to 20-30% for the Ag2Te NPs. These differences can be attributed to differences in chemical bonding. The precipitates' PME value is indicative of normal bonding, i.e., covalent bonding with normal optical modes, while materials with this unconventional bond breaking found in the matrix are characterized by metavalent bonding. This implies that the interface between the metavalently bonded matrix and covalently bonded Ag2Te NP is partly responsible for the reduced thermal conductivity in TAGS-50.
机译：简而言之（TAGS-x），研究了热电化合物（GeTe）（x）（AgSbTe2）（1-）（x），重点是两种化学计量比，即TAGS-50和TAGS-85。 TAGS-85是目前研究最多的热电材料之一，在热电应用中具有巨大的潜力。然而，令人惊讶的是，对于TAGS-50（而不是TAGS-85），其最低的导热系数被测出。为了解释这种意外的发现，对两个样品进行了原子探针层析成像（APT）测量，揭示了各种组成和大小的簇。最重要的作用归因于TAGS-50中发现的Ag2Te纳米沉淀（NPs）。与Ag2Te NPs相比，该基质揭示了一种非常规的键断裂机理。更具体地，通过APT对于矩阵观察到大约60％的多事件（PME）的高概率。出乎意料的是，对于Ag2Te NPs，PME值突然降低至大约20％至30％。这些差异可以归因于化学键合的差异。沉淀物的PME值指示正常键合，即，具有正常光学模式的共价键，而在基质中发现具有这种非常规键断裂的材料的特征在于亚共价键。这意味着，在共价键合的基质与共价键合的Ag2Te NP之间的界面部分是导致TAGS-50导热系数降低的部分原因。

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  • 来源
    《Advanced Functional Materials》 |2020年第17期|1910039.1-1910039.10|共10页
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  • 作者单位

    Rhein Westfal TH Aachen Phys Inst IA 1 Sommerfeldstr 14 D-52074 Aachen Germany;

    Rhein Westfal TH Aachen Phys Inst IA 1 Sommerfeldstr 14 D-52074 Aachen Germany|Forschungszentrum Julich JARA FIT JARA Inst Green IT D-52056 Aachen Germany|Rhein Westfal TH Aachen D-52056 Aachen Germany;

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  • 正文语种 eng
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  • 关键词

    interface scattering; metavalent bonding; nanoprecipitates; thermal conductivity; thermoelectrics;

    机译：界面散射;亚共价键;纳米沉淀导热系数;热电;

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