Tuning of band gap and thermoelectric properties of type-I clathrate Ba8NixZnyGe46-x-y-zSnz

被引：21
作者：
Falmbigl, M. [1 ]
Grytsiv, A. [1 ]
Rogl, P. [1 ]
Heinrich, P. [2 ]
Royanian, E. [2 ]
Bauer, E. [2 ]
机构：
[1] Univ Vienna, Inst Phys Chem, A-1090 Vienna, Austria
[2] Vienna Univ Technol, Inst Solid State Phys, A-1040 Vienna, Austria
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 567卷
关键词：
Thermoelectric materials; X-ray diffraction; Scanning Electron Microscopy; SEM; THERMAL-CONDUCTIVITY; BA8GA16GE30; SUBSTITUTION; FIGURE; MERIT;
D O I：
10.1016/j.jallcom.2013.03.074
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A detailed investigation of the influence of different Ni/Zn-ratios on the thermoelectric behavior of the quinary clathrate-I Ba8NixZnyGe46-x-y-zSnz is provided. All samples crystallize in the clathrate-I structure type (space group Pm (3) over barn) and exhibit n-type electrical conductivity. Varying the Ni-content, the band gap can be tuned in a wide range and hence the maximum in the thermoelectric figure of merit, ZT, can be shifted in a large temperature range from 530 to 830 K. The highest ZT-value of 0.9 at 830 K was observed for the Ni-poor composition Ba8Ni0.22Zn7.22Ge37.12Sn1.44. (C) 2013 Elsevier B. V. All rights reserved.
引用
收藏
页码：65 / 72
页数：8
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