Transport and mechanical properties of the double-filled p-type skutterudites La0.68Ce0.22Fe4−xCoxSb12
Source abstract
Abstract
Abstract Till date, the dimensionless figure of merit (ZT) of p-type skutterudites lags its n-type counterpart. In this work, we report improved thermoelectric performance of La/Ce double filled p-type skutterudites. The samples were synthesized by hot pressing nano-powder made by ball milling annealed ingots of La0.68Ce0.22Fe4−xCoxSb12 with varying Co concentration. By tuning the Fe/Co ratio, we achieved a higher power factor (∼35 μW cm−1 K−2 at 475 °C), leading to a peak ZT of 1.15 at ∼475 °C in La0.68Ce0.22Fe3.5Co0.5Sb12. Nanoindentation experiment carried on fine surface of the best sample reveals hardness of 5.4 GPa and modulus of elasticity of 126 GPa, which is much higher than those of Bi2Te3 and PbTe based materials, indicating skutterudites are mechanically strong, good for some practical applications.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Rare-earth and actinide compounds · Thermodynamic and Structural Properties of Metals and Alloys
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (51)
Show source-provided references
1. Skutterudites: a phonon glass electron crystal approach to advanced thermoelectric energy conversion applications10.1146/annurev.matsci.29.1.89 ↗
2. Thermoelectric materials for space and automotive power generation10.1557/mrs2006.49 ↗
3. Cooling, heating, generating power, and recovering waste heat with thermoelectric systems10.1126/science.1158899 ↗
4. Thermoelectrics: direct solar thermal energy conversion10.1557/mrs2008.73 ↗
5. Phonon scattering at grain boundaries in heavily doped fine-grained silicon-germanium alloys10.1038/290765a0 ↗
6. Boundary scattering of phonons in solid solutions10.1016/0375-9601(68)90898-0 ↗
7. Slack · 1995
8. Uher · 2000 · 69
9. Filled skutterudite antimonides: electron crystals and phonon glasses10.1103/PhysRevB.56.15081 ↗
10. Effect of parital void filling on the lattice thermal conductivity of skutterudites10.1103/PhysRevB.58.164 ↗
11. Magnetic, thermal, and electronic properties of iron-antimony filled skutterudites M4Fe4Sb12 (M=Na, K, Ca, Sr, Ba, La, Yb)
12. Multiple-filled skutterudites: high thermoelectric figure of merit through separately optimizing electrical and thermal transports10.1021/ja111199y ↗
13. Thermoelectric property enhancement in Yb-doped n-type skutterudites YbxCo4Sb1210.1016/j.actamat.2014.05.019 ↗
14. Substitution of antimony by tin and tellurium in n-type skutterudites CoSb2.8SnxTe0.2-x10.1007/s11837-014-1146-1 ↗
15. Enhanced thermoelectric performance in barium and indium double-filled skutterudite bulk materials via orbital hybridization induced by indium filler10.1021/ja8089334 ↗
16. Solubility study of Yb in n-type skutterudites YbxCo4Sb12 and their enhanced thermoelectric properties10.1103/PhysRevB.80.115329 ↗
17. n-type skutterudites (R, Ba, Yb)yCo4Sb12 (R=Sr, La, Mm, DD, SrMm, SrDD) approaching ZT ≈210.1016/j.actamat.2013.09.039 ↗
18. Dependence of thermoelectric behavior on severe plastic deformation parameters: a case study on p-type skutterudites DD0.6Fe3CoSb1210.1016/j.actamat.2013.07.052 ↗
19. Fast phase formation of double-filled p-type skutterudites by ball-milling and hot-pressing10.1039/c3cp50327e ↗
20. Thermoelectric performance of Ni compensated cerium and neodymium double filled p-type skutterudites10.1039/C4CP00383G ↗
21. Realization of high thermoelectric performance in n-type partially filled skutterudites10.1557/jmr.2011.84 ↗
22. p-type skutterudites RxMyFe3CoSb12 (R, M=Ba, Ce, Nd, and Yb): effectiveness of double-filling for the lattice thermal conductivity reduction10.1016/j.intermet.2011.06.010 ↗
23. Synthesis and thermoelectric properties of p-type double-filled La1-zCezFe4−xCoxSb1210.3938/jkps.67.360 ↗
24. Hay · 2000 · 8 · 232
25. Measurement of hardness and elastic modulus by instrumented indentation: advances in understanding and refinements to methodology10.1557/jmr.2004.19.1.3 ↗
26. Critical issues in making small-depth mechanical property measurements by nanoindentation with continuous stiffness measurement10.1557/jmr.2009.0096 ↗
27. High thermoelectric performance of nanostructured bismuth antimony telluride bulk alloys10.1126/science.1156446 ↗
28. Theoretical study of the filling fraction limits for impurities in CoSb310.1103/PhysRevB.75.235208 ↗
29. Electronic transport in semimetallic cerium sulfide10.1103/PhysRev.133.A1143 ↗
30. Nolas · 2001
31. Estimation of the thermal band gap of a semiconductor from Seebeck measurements10.1007/s11664-999-0211-y ↗
32. Electronic transport in lightly doped CoSb310.1103/PhysRevB.52.4926 ↗
33. Thermoelectric efficiency and compatibility10.1103/PhysRevLett.91.148301 ↗
34. Rowe · 1983
35. Thermoelectric property studies on Cu-doped n-type CuxBi2Te2.7Se0.3 nano-composite10.1002/aenm.201100149 ↗
36. Model for lattice thermal conductivity at low temperatures10.1103/PhysRev.113.1046 ↗
37. Effect of point imperfection on lattice thermal conductivity10.1103/PhysRev.120.1149 ↗
38. Lattice thermal transport in BaxREyCo4Sb12 (RE=Ce, Yb, and Eu) double-filled skutterudits10.1063/1.3429606 ↗
39. Angrist · 1977
40. Relationship between thermoelectric figure of merit and energy conversion efficiency10.1073/pnas.1510231112 ↗
41. Investigating the thermoelectric properties of p-type half-Heusler Hfx(ZrTi)1-xCoSb0.8Sn0.2 by reducing Hf concentration for power generation10.1039/C4RA14343D ↗
42. Study on thermoelectric performance by Na doping in nanostructured Mg1-xNaxAg0.97Sb0.9910.1016/j.nanoen.2014.11.027 ↗
43. Heavy doping and band engneering by potassium to improve the thermoelectric figure of merit in p type PbTe, PbSe, and PbTe1-ySey10.1021/ja301245b ↗
44. Engneering thermal conductivity for balancing between reliability and performance of bulk thermoelectric generators
45. Ultralow thermal conductivity and high thermoelectric figure of merit in SnSe crystals10.1038/nature13184 ↗
46. Influences of pileup on the measurement of mechanical properties by load and depth sensing indentation techniques10.1557/JMR.1998.0146 ↗
47. Room temperature Young’s modulus, shear modulus, Poisson’s ratio, and hardness of PbTe-PbS thermoelectric materials10.1016/j.mseb.2010.02.026 ↗
48. Mechanical properties of filled antimonide skutterudites10.1016/j.mseb.2010.02.022 ↗
49. Thermoelectric and mechanical properties on misch metal filled p-type skutterudites Mm0.9Fe4−xCoxSb12
50. Mechanical properties of BixSb2-xTe3 nanostructured thermoelectric material
51. Shackelford · 1995