Ce Filling Limit and Its Influence on Thermoelectric Performance of Fe(3)CoSb(12)-Based Skutterudite Grown by a Temperature Gradient Zone Melting Method.
Ce Filling Limit and Its Influence on Thermoelectric Performance of Fe(3)CoSb(12)-Based Skutterudite Grown by a Temperature Gradient Zone Melting Method.
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Ce填充极限及其对温度梯度区熔法生长Fe3CoSb12基方钴矿热电性能的影响
DOI:
10.3390/ma14226810
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发表时间:
2021-11-11
期刊:
影响因子:
--
通讯作者:
Chen ZG
中科院分区:
文献类型:
--
作者:
Li XG;Liu WD;Li SM;Li D;Zhu JX;Feng ZY;Yang B;Zhong H;Shi XL;Chen ZG
CoSb3-based skutterudite is a promising mid-temperature thermoelectric material. However, the high lattice thermal conductivity limits its further application. Filling is one of the most effective methods to reduce the lattice thermal conductivity. In this study, we investigate the Ce filling limit and its influence on thermoelectric properties of p-type Fe3CoSb12-based skutterudites grown by a temperature gradient zone melting (TGZM) method. Crystal structure and composition characterization suggests that a maximum filling fraction of Ce reaches 0.73 in a composition of Ce0.73Fe2.73Co1.18Sb12 prepared by the TGZM method. The Ce filling reduces the carrier concentration to 1.03 × 1020 cm−3 in the Ce1.25Fe3CoSb12, leading to an increased Seebeck coefficient. Density functional theory (DFT) calculation indicates that the Ce-filling introduces an impurity level near the Fermi level. Moreover, the rattling effect of the Ce fillers strengthens the short-wavelength phonon scattering and reduces the lattice thermal conductivity to 0.91 W m−1 K−1. These effects induce a maximum Seebeck coefficient of 168 μV K−1 and a lowest κ of 1.52 W m−1 K−1 at 693 K in the Ce1.25Fe3CoSb12, leading to a peak zT value of 0.65, which is 9 times higher than that of the unfilled Fe3CoSb12.
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DOI:
10.3390/ma11050847
发表时间:
2018-05-19
期刊:
Materials (Basel, Switzerland)
影响因子:
--
作者:
Fang T;Zhao X;Zhu T
通讯作者:
Zhu T
影响因子:
3.9
作者:
通讯作者:
--
影响因子:
4.4
作者:
Bhardwaj, Ruchi;Johari, Kishor Kumar;Dhar, Ajay
通讯作者:
Dhar, Ajay
影响因子:
9.5
作者:
Ghosh, Sanyukta;Shankar, Gyan;Mallik, Ramesh Chandra
通讯作者:
Mallik, Ramesh Chandra
影响因子:
6.2
作者:
Aversano, F.;Branz, S.;Castellero, A.
通讯作者:
Castellero, A.