Effects of partial La filling and Sb vacancy defects on CoSb3 skutterudites

Hu, Chongze; Zeng, Xiaoyu; Liu, Yufei; Zhou, Menghan; Zhao, Huijuan; Tritt, Terry M.; He, Jian; Jakowski, Jacek; Kent, Paul R.  C.; Huang, Jingsong; Sumpter, Bobby G.

doi:10.1103/PhysRevB.95.165204

Title: Effects of partial La filling and Sb vacancy defects on $CoS b_{3}$ skutterudites

Journal Article · Tue Apr 25 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.165204· OSTI ID:1354662

Hu, Chongze ^[1]; Zeng, Xiaoyu ^[2]; Liu, Yufei ^[2]; Zhou, Menghan ^[2]; Zhao, Huijuan ^[3]; Tritt, Terry M. ^[2]; He, Jian ^[2]; Jakowski, Jacek ^[4]; Kent, Paul R. C. ^[4]; Huang, Jingsong ^[4]; Sumpter, Bobby G. ^[4]

Clemson Univ., SC (United States). Dept. of Mechanical Engineering; Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Mechanical Engineering
Clemson Univ., SC (United States). Dept. of Physics and Astronomy
Clemson Univ., SC (United States). Dept. of Mechanical Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division

Over the past decade, the open frame ("cagey") structure of CoSb₃ skutterudite has invited intensive filling studies with various rare-earth elements for delivering state-of-the-art mid-temperature thermoelectric performance. In order to rationalize previously reported experimental results and provide new insight into the underexplored roles of La fillers and Sb vacancies, ab initio density functional theory studies, along with semi-classical Boltzmann transport theory calculations, are performed for pristine CoSb₃ of different lattice settings and La-filled CoSb₃ with and without Sb s mono- and di-vacancy defects. We examine the effects of van der Waals (vdW) interactions, spin-orbit coupling (SOC), spin polarization, partial La-filling, and Sb vacancy defects on the structural, electronic, and thermoelectric properties. The vdW interactions profoundly affect the lattice constant, which in turn affects the band gap. The SOC shows minor effects on the electronic and thermoelectric properties. The peculiar quasi-Dirac band in the pristine CoSb₃ largely survives La filling but not Sb vacancies, which instead introduce dispersive bands in the band gap region. Importantly, the band structure, density of states, and Fermi surface of La-filled CoSb₃ are significantly spin polarized, giving rise to spin-dependent thermoelectric properties. Seebeck coefficients directly calculated as a function of chemical potential are interpreted in connection with the electronic structures. Temperature-dependent Seebeck coefficients derived for the experimentally studied materials agree well with available experimental data. Seebeck coefficients obtained as a function of charge carrier concentration corroborate a thermoelectrically favorable role at high filling fractions played by the electron/hole pockets on the Fermi surface associated with the degenerate valleys/hills in the conduction/valence bands, respectively. Our results serve to advance the understanding of CoSb₃ skutterudite, a class of materials with important fundamental and application implications for thermoelectrics and spintronics.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231

OSTI ID:: 1354662

Alternate ID(s):: OSTI ID: 1353134

Journal Information:: Physical Review B, Vol. 95, Issue 16; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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Title: Effects of partial La filling and Sb vacancy defects on $CoS b_{3}$ skutterudites