Fast Preparation and Characterization of Quarternary Thermoelectric Clathrates

被引：25

作者：

Christensen, Mogens ^{[1
]}

Johnsen, Simon ^{[1
]}

Sondergaard, Martin ^{[1
]}

Overgaard, Jacob ^{[1
]}

Birkedal, Henrik ^{[1
]}

Iversen, Bo B. ^{[1
]}

机构：

[1] Univ Aarhus, Ctr Energy Mat, Dept Chem & iNANO, DK-8000 Aarhus C, Denmark

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 01期

关键词：

GE; SUPERSTRUCTURE; CANDIDATES; CRYSTAL;

D O I：

10.1021/cm802289n

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 large functionally graded single crystal has been synthesized by the Czochralski method. The resulting rod has a continuous composition range of Ba8Ga16(SixGe1-x)(30) going from x = 0.20(1) to 0.41(1). The exact composition was determined along the pulling direction by energy-dispersive X-ray spectroscopy (EDX), synchrotron powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction (SCXRD). Spatially resolved thermopower was measured using a Potential Seebeck Microprobe showing a gradual change in the thermopower with varying Si/Ge ratio. The gradual change is also observed in the clathrate lattice parameter. The present study demonstrates a method for fast preparation and characterization of a broad stoichiometry range in complex thermoelectric materials such as quarternary clathrate Ba8Ga16(SixGe1-x)(30). Furthermore, the method can potentially be used to produce functionally graded materials, which have thermoelectric properties optimized over a broad temperature range.

引用

页码：122 / 127

页数：6

共 43 条

[1] Strong phonon charge carrier coupling in thermoelectric clathrates [J].

Bentien, A ;

Johnsen, S ;

Iversen, BB .

PHYSICAL REVIEW B, 2006, 73 (09)

[2] Crystal structures, atomic vibration, and disorder of the type-I thermoelectric clathrates Ba8Ga16Si30, Ba8Ga16Ge30, Ba8In16Ge30, and Sr8Ga16Ge30 -: art. no. 144107 [J].

Bentien, A ;

Nishibori, E ;

Paschen, S ;

Iversen, BB .

PHYSICAL REVIEW B, 2005, 71 (14)

[3] Transport properties of composition tuned α- and β-Eu8Ga16-xGe30+x -: art. no. 165206 [J].

Bentien, A ;

Pacheco, V ;

Paschen, S ;

Grin, Y ;

Steglich, F .

PHYSICAL REVIEW B, 2005, 71 (16)

[4]

Bentien A, 2000, ANGEW CHEM INT EDIT, V39, P3613, DOI 10.1002/1521-3773(20001016)39:20<3613::AID-ANIE3613>3.0.CO

[5]

2-D

[6] Maximum entropy method analysis of thermal motion and disorder in thermoelectric clathrate Ba8Ga16Si30 [J].

Bentien, A ;

Iversen, BB ;

Bryan, JD ;

Stucky, GD ;

Palmqvist, AEC ;

Schultz, AJ ;

Henning, RW .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (09) :5694-5699

[7] Ba8Ge43 revisited:: a 2a′ x 2a′ x 2a′ superstructure of the clathrate-I type with full vacancy ordering [J].

Carrillo-Cabrera, W ;

Budnyk, S ;

Prots, Y ;

Grin, Y .

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 2004, 630 (13-14) :2267-2276

[8]

Carrillo-Cabrera W, 2002, Z KRIST-NEW CRYST ST, V217, P183

[9] Host structure engineering in thermoelectric clathrates [J].

Christensen, M. ;

Iversen, B. B. .

CHEMISTRY OF MATERIALS, 2007, 19 (20) :4896-4905

[10] Avoided crossing of rattler modes in thermoelectric materials [J].

Christensen, Mogens ;

Abrahamsen, Asger B. ;

Christensen, Niels B. ;

Juranyi, Fanni ;

Andersen, Niels H. ;

Lefmann, Kim ;

Andreasson, Jakob ;

Bahl, Christian R. H. ;

Iversen, Bo B. .

NATURE MATERIALS, 2008, 7 (10) :811-815

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