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arXiv 2107.09397cond-mat.mtrl-sci
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固态Janus纳米沉淀使结晶Mg3Sb2-based热电材料实现非晶状热传导

Solid-state Janus nanoprecipitation enables amorphous-like heat conduction in crystalline Mg3Sb2-based thermoelectric materials

Rui Shu, Zhijia Han, Anna Elsukova, Yongbin Zhu, Peng Qin, Feng Jiang, Jun Lu, Per O. Å. Persson, Justinas Palisaitis, Arnaud le Febvrier, Wenqing Zhang, Oana C… 展开作者

Rui Shu, Zhijia Han, Anna Elsukova, Yongbin Zhu, Peng Qin, Feng Jiang, Jun Lu, Per O. Å. Persson, Justinas Palisaitis, Arnaud le Febvrier, Wenqing Zhang, Oana Cojocaru-Mirédin, Yuan Yu, Per Eklund, Weishu Liu

发表信息：
Advanced Science 2202594 (2022)
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摘要：

固态沉淀可用于定制材料性能，从铁磁体和催化剂到机械强化和能量存储。热电性能可以修改沉淀，以提高声子散射，同时保持电荷载流子传输。在这里，我们发现了非常规的双Janus型纳米沉淀物在Mg3Sb1.5Bi0.5形成的并排的Bi和Ge丰富的附件，在单独的纳米沉淀物形成对比。这些Janus纳米沉淀物由烧结期间Bi和Ge的局部共熔融产生，从而实现非晶状晶格热导率。由于合金无序和纳米沉淀物散射之间的平衡，观察到声子散射的沉淀物尺寸效应。热电优值系数ZT在室温附近为0.6，在773K时为1.6。Janus纳米沉淀可以被引入到其他材料中，并可以作为一种通用的性能定制机制。

英文摘要：

Solid-state precipitation can be used to tailor materials properties, ranging from ferromagnets and catalysts to mechanical strengthening and energy storage. Thermoelectric properties can be modified by precipitation to enhance phonon scattering while retaining charge-carrier transmission. Here, we uncover unconventional dual Janus-type nanoprecipitates in Mg3Sb1.5Bi0.5 formed by side-by-side Bi- and Ge-rich appendages, in contrast to separate nanoprecipitate formation. These Janus nanoprecipitates result from local co-melting of Bi and Ge during sintering, enabling an amorphous-like lattice thermal conductivity. A precipitate size effect on phonon scattering is observed due to the balance between alloy-disorder and nanoprecipitate scattering. The thermoelectric figure-of-merit ZT reaches 0.6 near room temperature and 1.6 at 773 K. The Janus nanoprecipitation can be introduced into other materials and may act as a general property-tailoring mechanism.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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