Thermoelectric performance of large single crystal clathrate Ba8Ga16Ge30

被引:12
作者
Bertini, L [1 ]
Billquist, K [1 ]
Bryan, D [1 ]
Christensen, M [1 ]
Gatti, C [1 ]
Holmgren, L [1 ]
Iversen, BB [1 ]
Mueller, E [1 ]
Muhammed, M [1 ]
Noriega, G [1 ]
Palmqvist, AEC [1 ]
Platzek, D [1 ]
Rowe, DM [1 ]
Saramat, A [1 ]
Stiewe, C [1 ]
Stucky, GD [1 ]
Svensson, G [1 ]
Toprak, M [1 ]
Williams, SGK [1 ]
Zhang, Y [1 ]
机构
[1] CNR, ISTM, I-20133 Milan, Italy
来源
TWENTY-SECOND INTERNATIONAL CONFERENCE ON THERMOELECTRICS, PROCEEDINGS ICT '03 | 2003年
关键词
D O I
10.1109/ICT.2003.1287465
中图分类号
O414.1 [热力学];
学科分类号
摘要
A method for growing single crystals of the clathrate Ba8Ga16Ge30 has been developed and a suitable specimen prepared. The crystal with a diameter of 7 mm and a length of 46 mm was cut into discs, which were analyzed with respect to chemical composition, crystal structure and thermoelectric properties. Typical disc samples were found to be n-doped with the Seebeck coefficient increasing from -50 muV/K at 300 K to -185 muV/K at 900 K. The thermal conductivity was found to be close to 2 W/mK and only slightly decreasing with increasing temperature. The resistivity of the sample increased from 0.65 mOmegacm at 300 K to 1.8 mOmegacm at 900 K. Combining these results the dimensionless thermoelectric figure-of-merit, ZT (= TS2/Rlambda), was found to increase from ZT = 0.08 at room temperature to ZT > 1.0 at 900 K. Preliminary data indicates that ZT appears to further increase with temperature above 900 K. These results emphasize the position of the Ba8Ga16Ge30 clathrate as being in the same range of thermoelectric performance as the current state of the art materials at the medium to high temperature range.
引用
收藏
页码:127 / 130
页数:4
相关论文
共 17 条
[1]   Thermoelectric properties of Ba8GaxGe46-x clathrate compounds [J].
Anno, H ;
Hokazono, M ;
Kawamura, M ;
Nagao, J ;
Matsubara, K .
XXI INTERNATIONAL CONFERENCE ON THERMOELECTRICS, PROCEEDINGS ICT '02, 2002, :77-80
[2]  
Bentien A., 2000, ANGEW CHEM, V112, P3759
[3]   Band structures and thermoelectric properties of the clathrates Ba8Ga16Ge30, Sr8Ga16Ge30, Ba8Ga16Si30, and Ba8In16Sn30 [J].
Blake, NP ;
Latturner, S ;
Bryan, JD ;
Stucky, GD ;
Metiu, H .
JOURNAL OF CHEMICAL PHYSICS, 2001, 115 (17) :8060-8073
[4]  
BRYAN D, 2002, THESIS, P25
[5]   Nonstoichiometry and chemical purity effects in thermoelectric Ba8Ga16Ge30 clathrate [J].
Bryan, JD ;
Blake, NP ;
Metiu, H ;
Stucky, GD ;
Iversen, BB ;
Poulsen, RD ;
Bentien, A .
JOURNAL OF APPLIED PHYSICS, 2002, 92 (12) :7281-7290
[6]   Structural disorder and thermal conductivity of the semiconducting clathrate Sr8Ga16Ge30 [J].
Chakoumakos, BC ;
Sales, BC ;
Mandrus, DG ;
Nolas, GS .
JOURNAL OF ALLOYS AND COMPOUNDS, 2000, 296 (1-2) :80-86
[7]   AII(8)BIII(16)BIV(30) COMPOUNDS (AII = SR, BA - BIII = AL, GA - BIV = SI, GE, SN) AND THEIR CAGE STRUCTURES [J].
EISENMANN, B ;
SCHAFER, H ;
ZAGLER, R .
JOURNAL OF THE LESS-COMMON METALS, 1986, 118 (01) :43-55
[8]   Guest-framework interaction in type I inorganic clathrates with promising thermoelectric properties:: On the ionic versus neutral nature of the alkaline-earth metal guest a in A8Ga16Ge30 (A = Sr, Ba) [J].
Gatti, C ;
Bertini, L ;
Blake, NP ;
Iversen, BB .
CHEMISTRY-A EUROPEAN JOURNAL, 2003, 9 (18) :4556-4568
[9]   Why are clathrates good candidates for thermoelectric materials? [J].
Iversen, BB ;
Palmqvist, AEC ;
Cox, DE ;
Nolas, GS ;
Stucky, GD ;
Blake, NP ;
Metiu, H .
JOURNAL OF SOLID STATE CHEMISTRY, 2000, 149 (02) :455-458
[10]   Preparation and thermoelectric properties of A8IIB16IIIB30IV clathrate compounds [J].
Kuznetsov, VL ;
Kuznetsova, LA ;
Kaliazin, AE ;
Rowe, DM .
JOURNAL OF APPLIED PHYSICS, 2000, 87 (11) :7871-7875