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 - Funding Information:
This work was supported by the National Natural Science Foundation of China under Projects (21571020, 20973175, 21233009, 21301175, 21225104, and 91422303) and the NSF of Fujian Province (No. 2015J01071). At Northwestern this work (sample preparation, thermoelectric measurements, DFT calculations) was supported by the Department of Energy, Office of Science Basic Energy Sciences grant DE-SC0014520.
PY - 2016
Y1 - 2016
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
VL - 55
SP - 11431
EP - 11436
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
SN - 1433-7851
IS - 38
ER -