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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Thermoelectric properties of the Ca_5Al_(2?x)In_xSb_6 solid solution
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Thermoelectric properties of the Ca_5Al_(2?x)In_xSb_6 solid solution

机译：Ca_5Al_（2？x）In_xSb_6固溶体的热电性能

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摘要

Zintl phases are attractive for thermoelectric applications due to their complex structures and bonding environments. The Zintl compounds Ca_5Al_2Sb_6 and Ca_5In_2Sb_6 have both been shown to have promising thermoelectric properties, with zT values of 0.6 and 0.7, respectively, when doped to control the carrier concentration. Alloying can often be used to further improve thermoelectric materials in cases when the decrease in lattice thermal conductivity outweighs reductions to the electronic mobility. Here we present the high temperature thermoelectric properties of the Ca_5Al_(2?x)In_xSb_6 solid solution. Undoped and optimally Zn-doped samples were investigated. X-ray diffraction confirms that a full solid solution exists between the Al and In end-members. We find that the Al: In ratio does not greatly influence the carrier concentration or Seebeck effect. The primary effect of alloying is thus increased scattering of both charge carriers and phonons, leading to significantly reduced electronic mobility and lattice thermal conductivity at room temperature. Ultimately, the figure of merit is unaffected by alloying in this system, due to the competing effects of reduced mobility and lattice thermal conductivity.
机译：Zintl相由于其复杂的结构和键合环境而对热电应用具有吸引力。 Zintl化合物Ca_5Al_2Sb_6和Ca_5In_2Sb_6均具有良好的热电性能，掺杂以控制载流子浓度时zT值分别为0.6和0.7。当晶格热导率的下降大于电子迁移率的下降时，合金化通常可用于进一步改善热电材料。在这里，我们介绍了Ca_5Al_（2？x）In_xSb_6固溶体的高温热电性质。研究了未掺杂和最佳掺杂锌的样品。 X射线衍射证实在Al和In末端成员之间存在完全固溶体。我们发现Al：In比率不会对载流子浓度或塞贝克效应产生很大影响。因此，合金化的主要作用是增加电荷载流子和声子的散射，从而导致室温下电子迁移率和晶格热导率大大降低。最终，由于降低的迁移率和晶格导热性的竞争效应，品质因数不受该系统中合金化的影响。

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