TY - JOUR
T1 - Concerted Rattling in CsAg5Te3Leading to Ultralow Thermal Conductivity and High Thermoelectric Performance
AU - Lin, Hua
AU - Tan, Gangjian
AU - Shen, Jin Ni
AU - Hao, Shiqiang
AU - Wu, Li Ming
AU - Calta, Nicholas
AU - Malliakas, Christos
AU - Wang, Si
AU - Uher, Ctirad
AU - Wolverton, Christopher
AU - Kanatzidis, Mercouri G.
N1 - Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2016/9/12
Y1 - 2016/9/12
N2 - Thermoelectric (TE) materials convert heat energy directly into electricity, and introducing new materials with high conversion efficiency is a great challenge because of the rare combination of interdependent electrical and thermal transport properties required to be present in a single material. The TE efficiency is defined by the figure of merit ZT=(S2σ) T/κ, where S is the Seebeck coefficient, σ is the electrical conductivity, κ is the total thermal conductivity, and T is the absolute temperature. A new p-type thermoelectric material, CsAg5Te3, is presented that exhibits ultralow lattice thermal conductivity (ca. 0.18 Wm−1K−1) and a high figure of merit of about 1.5 at 727 K. The lattice thermal conductivity is the lowest among state-of-the-art thermoelectrics; it is attributed to a previously unrecognized phonon scattering mechanism that involves the concerted rattling of a group of Ag ions that strongly raises the Grüneisen parameters of the material.
AB - Thermoelectric (TE) materials convert heat energy directly into electricity, and introducing new materials with high conversion efficiency is a great challenge because of the rare combination of interdependent electrical and thermal transport properties required to be present in a single material. The TE efficiency is defined by the figure of merit ZT=(S2σ) T/κ, where S is the Seebeck coefficient, σ is the electrical conductivity, κ is the total thermal conductivity, and T is the absolute temperature. A new p-type thermoelectric material, CsAg5Te3, is presented that exhibits ultralow lattice thermal conductivity (ca. 0.18 Wm−1K−1) and a high figure of merit of about 1.5 at 727 K. The lattice thermal conductivity is the lowest among state-of-the-art thermoelectrics; it is attributed to a previously unrecognized phonon scattering mechanism that involves the concerted rattling of a group of Ag ions that strongly raises the Grüneisen parameters of the material.
KW - CsAgTe
KW - concerted rattling
KW - thermoelectric materials
KW - tunnel structure
KW - ultralow thermal conductivity
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U2 - 10.1002/anie.201605015
DO - 10.1002/anie.201605015
M3 - Article
C2 - 27513458
AN - SCOPUS:84981543718
SN - 1433-7851
VL - 55
SP - 11431
EP - 11436
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 38
ER -