Structural principles and thermoelectric properties of polytypic group 14 clathrate-II frameworks.

Structural principles and thermoelectric properties of polytypic group 14 clathrate-II frameworks.
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多型14族笼形II骨架的结构原理和热电性能

DOI:
10.1002/cphc.201300133
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发表时间:
2013
期刊:
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
T. F. Fässler
T. F. Fässler
中科院分区:
--
文献类型:
--
作者:
A. Karttunen;T. F. Fässler

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我们使用量子化学方法研究了多型14族笼形物-II框架的结构原理和热电性能。实验上已知的立方3C多型体被发现是能量上最有利的骨架,但研究的六方多型体(2 H,4 H,6 H,8 H,10 H)在能量上接近它。在锗的情况下,3C和6 H笼形物-II多型体之间的能量差比实验上已知的3C-Ge(α-Ge)和4 H-Ge多型体之间的能量差小十倍。研究了Na-Rb-Ga-Ge和Ge-As-I组成的客体占据笼形物-II结构的热电性质。笼形物-II结构显示出有前途的热电性能,并且预测3C多型体具有最高的Seebeck系数和热电功率因子。所研究的最大六边形多型体的结构各向异性对其热电功率因子的影响超过两倍。
We have investigated the structural principles and thermoelectric properties of polytypic group 14 clathrate‐II frameworks using quantum chemical methods. The experimentally known cubic 3C polytype was found to be the energetically most favorable framework, but the studied hexagonal polytypes (2 H, 4 H, 6 H, 8 H, 10 H) lie energetically close to it. In the case of germanium, the energy difference between the 3C and 6H clathrate‐II polytypes is ten times smaller than the difference between the experimentally known 3C‐Ge (α‐Ge) and 4H‐Ge polytypes. The thermoelectric properties of guest‐occupied clathrate‐II structures were investigated for compositions Na–Rb–Ga–Ge and Ge–As–I. The clathrate‐II structures show promising thermoelectric properties and the highest Seebeck coefficients and thermoelectric power factors were predicted for the 3C polytype. The structural anisotropy of the largest studied hexagonal polytypes affects their thermoelectric power factors by over a factor of two.
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