Unraveling the Role of Entropy in Thermoelectrics: Entropy-Stabilized Quintuple Rock Salt PbGeSnCd x Te 3+ x .

التفاصيل البيبلوغرافية
العنوان:	Unraveling the Role of Entropy in Thermoelectrics: Entropy-Stabilized Quintuple Rock Salt PbGeSnCd x Te 3+ x .
المؤلفون:	Liu Y; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States., Xie H; Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.; School of Materials Science and Engineering, Beihang University, Beijing 100191, China., Li Z; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States., Zhang Y; Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States., Malliakas CD; Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States., Al Malki M; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States., Ribet S; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States., Hao S; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States., Pham T; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States., Wang Y; Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States., Hu X; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States., Dos Reis R; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States., Snyder GJ; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States., Uher C; Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States., Wolverton C; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States., Kanatzidis MG; Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States., Dravid VP; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.
المصدر:	Journal of the American Chemical Society [J Am Chem Soc] 2023 Apr 07. Date of Electronic Publication: 2023 Apr 07.
Publication Model:	Ahead of Print
نوع المنشور:	Journal Article
اللغة:	English
بيانات الدورية:	Publisher: American Chemical Society Country of Publication: United States NLM ID: 7503056 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1520-5126 (Electronic) Linking ISSN: 00027863 NLM ISO Abbreviation: J Am Chem Soc Subsets: MEDLINE
أسماء مطبوعة:	Publication: Washington, DC : American Chemical Society Original Publication: Easton, Pa. [etc.]
مستخلص:	Entropy-engineered materials are garnering considerable attention owing to their excellent mechanical and transport properties, such as their high thermoelectric performance. However, understanding the effect of entropy on thermoelectrics remains a challenge. In this study, we used the PbGeSnCd x Te 3+ x family as a model system to systematically investigate the impact of entropy engineering on its crystal structure, microstructure evolution, and transport behavior. We observed that PbGeSnTe 3 crystallizes in a rhombohedral structure at room temperature with complex domain structures and transforms into a high-temperature cubic structure at ∼373 K. By alloying CdTe with PbGeSnTe 3 , the increased configurational entropy lowers the phase-transition temperature and stabilizes PbGeSnCd x Te 3+ x in the cubic structure at room temperature, and the domain structures vanish accordingly. The high-entropy effect results in increased atomic disorder and consequently a low lattice thermal conductivity of 0.76 W m ^-1 K ^-1 in the material owing to enhanced phonon scattering. Notably, the increased crystal symmetry is conducive to band convergence, which results in a high-power factor of 22.4 μW cm ^-1 K ^-1 . As a collective consequence of these factors, a maximum ZT of 1.63 at 875 K and an average ZT of 1.02 in the temperature range of 300-875 K were obtained for PbGeSnCd 0.08 Te 3.08 . This study highlights that the high-entropy effect can induce a complex microstructure and band structure evolution in materials, which offers a new route for the search for high-performance thermoelectrics in entropy-engineered materials.
تواريخ الأحداث:	Date Created: 20230407 Latest Revision: 20230407
رمز التحديث:	20230407
DOI:	10.1021/jacs.3c01693
PMID:	37026697
قاعدة البيانات:	MEDLINE

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تدمد:	1520-5126
DOI:	10.1021/jacs.3c01693