HPHT Synthesis: Effects of the Synergy of Pressure Regulation and Atom Filling on the Microstructure and Thermoelectric Properties of YbxBa8–xGa16Ge30 | Zendy

Bing Sun | Zendy; Yingde Li | Zendy; Lianzhen Cao | Zendy; Yongmi Chen | Zendy; Xinmin Fan | Zendy; Yang Yang | Zendy; Xia Liu | Zendy; Chunyan Wang | Zendy; Xiaodong Huang | Zendy; Xinle Wang | Zendy; Yongzhi Sun | Zendy; Jiaqiang Zhao | Zendy; Hongan Ma | Zendy

Open Access

HPHT Synthesis: Effects of the Synergy of Pressure Regulation and Atom Filling on the Microstructure and Thermoelectric Properties of Yb_xBa_8–xGa₁₆Ge₃₀

Author(s) -

Bing Sun,

Yingde Li,

Lianzhen Cao,

Yongmi Chen,

Xinmin Fan,

Yang Yang,

Xia Liu,

Chunyan Wang,

Xiaodong Huang,

Xinle Wang,

Yongzhi Sun,

Jiaqiang Zhao,

Hongan Ma

Publication year - 2020

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.0c01334

Subject(s) - microstructure , thermoelectric effect , materials science , electrical resistivity and conductivity , seebeck coefficient , atom (system on chip) , phonon , thermal conductivity , grain boundary , condensed matter physics , phonon scattering , thermal expansion , lattice (music) , thermoelectric materials , thermodynamics , composite material , physics , computer science , acoustics , electrical engineering , embedded system , engineering

Type-I clathrate compounds Yb x Ba 8- x Ga 16 Ge 30 have been synthesized by the high-pressure and high-temperature (HPHT) method rapidly. The effects of the synergy of atom filling and pressure regulation on the microstructure and thermal and electrical properties have been investigated. With the content of Yb atom increasing, the carrier concentration is improved, the electrical resistivity and the absolute Seebeck coefficient are decreased, while the thermal conductivity is reduced significantly. A series of extremely low lattice thermal conductivities are achieved, attributed to the enhancement of multiscale phonon scattering for the "rattling" of the filled guest atoms, the heterogeneous distribution of nano- and microstructures, grain boundaries, abundant lattice distortions, lattice deformations, and dislocations. As a result, a maximum ZT of about 1.07 at 873 K has achieved for the Yb 0.5 Ba 7.5 Ga 16 Ge 30 sample.

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