p-Type skutterudites RxMyFe3CoSb12 (R, M = Ba, Ce, Nd, and Yb): Effectiveness of double-filing for the lattice thermal conductivity reduction
Journal Article
·
· Intermetallics
- CAS Key Lab. for Energy-conversion Materials, Shanghai Inst. of Ceramics, Chinese Academy of Sciences (CAS), Shanghai (China)
- State Key Lab. of High Perf. Ceramics and Superfine Microstructure, Shanghai Inst. of Ceramics, Chinese Academy of Sciences (CAS), Shanghai (China)
- Univ. of Michigan, Ann Arbor, MI (United States)
Ab-initio calculations of the resonant modes and frequencies for a number of possible fillers in p-type RFe₃CoSb₁₂ and RFe₄Sb₁₂ were carried out. The results indicate that, although the exact values of fillers’ resonant frequencies in p-type skutterudites are somewhat different from those in n-type Co-based skutterudites, the Einstein-like resonant modes of the fillers are similar to those in n-type materials. Experimentally, several pairs of the fillers were selected and double-filled p-type skutterudite compounds R{sub x}M{sub y}Fe₃CoSb₁₂ (R, M = Ba, Ce, Nd, and Yb) were successfully synthesized. The reduction in the lattice thermal conductivity was realized by extending the range of resonant frequencies. As a result, enhanced ZT values above unity were achieved in these double-filled p-type skutterudites.
- Research Organization:
- Energy Frontier Research Centers (EFRC); Center for Solar and Thermal Energy Conversion (CSTEC)
- Sponsoring Organization:
- USDOE SC Office of Basic Energy Sciences (SC-22)
- Contributing Organization:
- Chinese Academy of Sciences, Shanghai (China); National Basic Research Program of China
- DOE Contract Number:
- SC0000957
- OSTI ID:
- 1065639
- Journal Information:
- Intermetallics, Journal Name: Intermetallics Journal Issue: 11 Vol. 19; ISSN 0966-9795
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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