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合成和表征Ba₁₆Si₈Te_44+δ和Ba₆Si₄Te₆(Te₃的结构与复杂的Te-Te相互作用

Sweta Yadav¹, Swati¹, Manish K Niranjan²

¹Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502284, India.

Inorganic chemistry

|January 6, 2025

概括

合成了两个新的三元聚化物,Ba16Si8Te44+δ和Ba6Si4Te6(Te3) 3. 16Si8Te44.2样本显示出异常低的导热率,对于热电材料来说,这是一个有希望的结果.

科学领域:

固态化学固态化学
材料科学材料科学材料科学
无机化学无机化学有机化学

背景情况:

具有复杂结构和狭窄带隙的多元化物对热电应用具有前景.
开发具有增强热电性能的新材料对于能源转换技术至关重要.

研究的目的:

为了合成和表征新的三元聚化化合物.
研究Ba16Si8Te44+δ和Ba6Si4Te6(Te3)3.3.3的结构复杂性和潜在的热电特性.

主要方法:

新型三元聚氨酸的合成:Ba16Si8Te44+δ和Ba6Si4Te6(Te3)3.3.
单晶X射线衍射用于结构确定.
测量热导率和电阻. 测量热导率和电阻.
密度函数理论 (DFT) 计算用于电子结构分析.

主要成果:

发现了两种前所未有的三元聚化结构:Ba16Si8Te44+δ和Ba6Si4Te6(Te3)3.3.
Ba16Si8Te44+δ含有多种多化物单位 (Te7,Te3,Te2) 和四面体SiTe4单位.
Ba6Si4Te6(Te3) 3具有离子[Si4Te15]12-层,由Si2Te6二元和Te3三元组成,包括线性和曲的Te3单元.
一个多晶的Ba16Si8Te44.2样本显示出一个非常低的0.41 Wm-1 K-1的总导热率在623 K.
电阻测量显示,电阻在60K以下出现了不寻常的上升.

结论:

合成的化合物代表了多核化物中的新型结构类型.
16Si8Te44.2的低导热率突出了其作为高效的热电材料的潜力.
对电子结构和热电性能进行进一步的研究是有必要的.

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