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

页码：65 / 72

页数：8

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