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| 1 | Achieving High Thermoelectric Performance in Rare-Earth Element-Free CaMg_(2)Bi_(2) with High Carrier Mobility and Ultralow Lattice Thermal Conductivity显示文摘CaMg_(2)Bi_(2)-based compounds,a kind of the representative compounds of Zintl phases,have uniquely inherent layered structure and hence are considered to be potential thermoelectric materials.Generally,alloying is a traditional and effective way to reduce the lattice thermal conductivity through the mass and strain field fluctuation between host and guest atoms.The cation sites have very few contributions to the band structure around the fermi level;thus,cation substitution may have negligible influence on the electric transport properties.What is more,widespread application of thermoelectric materials not only desires high ZT value but also calls for low-cost and environmentally benign constituent elements.Here,Ba substitution on cation site achieves a sharp reduction in lattice thermal conductivity through enhanced point defects scattering without the obvious sacrifice of high carrier mobility,and thus improves thermoelectric properties.Then,by combining further enhanced phonon scattering caused by isoelectronic substitution of Zn on the Mg site,an extraordinarily low lattice thermal conductivity of 0.51Wm^(-1) K^(-1) at 873 K is achieved in(Ca_(0.75)Ba_(0.25))_(0.995)Na_(0.005)Mg_(1.95)Zn_(0.05)Bi_(1.98) alloy,approaching the amorphous limit.Such maintenance of high mobility and realization of ultralow lattice thermal conductivity synergistically result in broadly improvement of the quality factorβ.Finally,a maximum ZT of 1.25 at 873K and the corresponding ZTave up to 0.85 from 300 K to 873K have been obtained for the same composition,meanwhile possessing temperature independent compatibility factor.To our knowledge,the current ZTave exceeds all the reported values in AMg_(2)Bi_(2)-based compounds so far.Furthermore,the low-cost and environmentfriendly characteristic plus excellent thermoelectric performance also make the present Zintl phase CaMg_(2)Bi_(2) more competitive in practical application. | Muchun Guo Fengkai Guo Jianbo Zhu Li Yin Qian Zhang Wei Cai Jiehe Sui | 2020 | Research2020，，1： | 2 |
| 2 | 利用点缺陷策略提高Zintl相BaAgSb的热电性能显示文摘Zintl相化合物由于其独特的'声子玻璃-电子晶体'(PGEC)结构在热电领域具有广泛的应用前景.本文报道了Zintl相热电材料BaAgSb的热电性质.通过引入Ba空位,可以提高p型BaAgSb的载流子浓度,抑制其本征激发,Ba_(0.98)AgSb的ZT值在773 K达到了~0.56.此外,在Ba位进一步合金化Eu,不仅能够引入点缺陷散射降低晶格热导率,而且由于载流子迁移率的提高使其电输运性质也得到了改善.最终,Ba_(0.78)Eu_(0.2)AgSb的ZT值在773 K达到~0.73. | 黄奕芳 陈辰 张伟明 李孝芳 薛文华 王心宇 刘一杰 姚洪浩 张宗委 陈粤 曹峰 刘兴军 王玉梅 张倩 | 2021 | Science China Materials2021，64，10： | 0 |
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