DocumentCode :
2197395
Title :
Synthesis and electrical transport properties of p-type Ba8Ga16CdxGe30−x type-I clathrates
Author :
Deng, Shukang ; Tang, Xinfeng ; Li, Han ; Yan, Yonggao ; Zhang, Qingjie
Author_Institution :
State Key Lab. of Adv. Technol. for Mater. Synthesis & Process., Wuhan Univ. of Technol., Wuhan
fYear :
2007
fDate :
3-7 June 2007
Firstpage :
230
Lastpage :
233
Abstract :
P-type Ba8Ga16CdxGe30-x (x=0.95, 1.00, 1.05, 1.10) type-I clathrates with different Cd contents were synthesized by combining melt method with spark plasma sintering (SPS). The effects of Cd content on electrical transport properties have been investigated. The results show that all samples exhibit p-type conduction. The Seebeck coefficient alpha and room temperature carrier mobility muH decrease with the increasing Cd content. The electrical conductivity sigma and the room temperature carrier concentration Np increase with the increase of Cd content. In the low temperature range (T<150 K), the carrier scattering mechanism is mainly ionized impurity mechanism, and gradually changes to an acoustical mechanism with the rising temperature. The maximum power factor value of 0.35times10-3 Wm-1K-2 is obtained at 550 K for Ba8Ga16Cd1.00Ge29.00.
Keywords :
Seebeck effect; barium alloys; cadmium alloys; carrier density; carrier mobility; electrical conductivity; gallium alloys; germanium alloys; sintering; Ba8Ga16CdxGe30-x; Seebeck coefficient; acoustical mechanism; carrier scattering mechanism; electrical conductivity; electrical transport properties; ionized impurity mechanism; melt method; p-type conduction; room temperature carrier concentration; room temperature carrier mobility; spark plasma sintering; temperature 293 K to 298 K; temperature 550 K; type-I clathrates; Conducting materials; Inorganic materials; Plasma properties; Plasma temperature; Reactive power; Sparks; Temperature distribution; Thermal conductivity; Thermoelectricity; X-ray scattering; electrical transport property; p-type conduction; type-I clathrate;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Thermoelectrics, 2007. ICT 2007. 26th International Conference on
Conference_Location :
Jeju Island
ISSN :
1094-2734
Print_ISBN :
978-1-4244-2262-3
Electronic_ISBN :
1094-2734
Type :
conf
DOI :
10.1109/ICT.2007.4569466
Filename :
4569466
Link To Document :
https://search.ricest.ac.ir/dl/search/defaultta.aspx?DTC=49&DC=2197395
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