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P-type and N-type Bi2Te3/PbTe functional gradient materials for thermoelectric power generation
- Authors
- Lee, K.-Y.; Oh, T.-S.
- Issue Date
- 2007
- Publisher
- Trans Tech Publications Ltd
- Keywords
- Bismuth telluride; Figure of merit; Functional gradient materials; Lead telluride; Thermoelectric materials
- Citation
- Materials Science Forum, v.534-536, no.PART 2, pp.1493 - 1496
- Journal Title
- Materials Science Forum
- Volume
- 534-536
- Number
- PART 2
- Start Page
- 1493
- End Page
- 1496
- ISSN
- 0255-5476
- Abstract
- The p-type (Bi0.2Sb0.8)2Te 3/(Pb0.7Sn0.3)Te functional gradient material (FGM) was fabricated by hot-pressing the mechanically alloyed (Bi 0.2Sb0.8)2Te3 and the 0.5 at% Na2Te-doped (Pb0.7Sn0.3)Te powders. Also, the n-type Bi2(Te0.9Se0.1)3/PbTe FGM was processed by hot-pressing the mechanically alloyed Bi2(Te 0.9Se0.1)3 and the 0.3 wt% Bi-doped PbTe powders. With ΔT larger than 300°C, the p-type (Bi 0.2Sb0.8)2Te3/(Pb 0.7Sn0.3)Te FGM exhibited larger thermoelectric output power than those of the (Bi0.2Sb0.8)2Te 3 and the 0.5 at% Na2Te-doped (Pb0.7Sn 0.3)Te alloys. For the n-type Bi2(Te0.9Se 0.1)3/PbTe FGM, the thermoelectric output power superior to those of the Bi2(Te0.9Se0.1)3 and the 0.3 wt% Bi-doped PbTe was predicted at ΔT larger than 300°C.
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