Phonon-glass electron-crystal behaviour by A site disorder in n-type thermoelectric oxides
Phonon-glass electron-crystal behaviour by A site disorder in n-type thermoelectric oxides
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DOI：
10.1039/c7ee01510k
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发表时间：
2017-09-01
影响因子：
32.5
通讯作者：
Rosseinsky, M. J.
中科院分区：
文献类型：
--
作者：
Daniels, L. M.;Savvin, S. N.;Rosseinsky, M. J.
La0.5Na0.5Ti1-xNbxO3 热电氧化物实现了声子玻璃电子晶体 (PGEC) 行为。 ABO(3) 钙钛矿氧化物 La0.5Na0.5TiO3 的 A 位上存在 La3+ 和 Na+ 阳离子造成的振动紊乱产生了声子玻璃，其热导率 kappa 在室温下比 SrTiO3 低 80%。与其他最先进的热电氧化物不同，这些材料的卡伯与电子功率因数有很强的耦合作用，这些材料的电子传输可以通过八面体 B 位点的阳离子取代独立于热传输进行优化。 La0.5Na0.5Ti1-xNbxO3 系列保留了声子玻璃母体的低 kappa 特性，而不会破坏电子传导性，从而在氧化物中提供 PGEC 行为。
Phonon-glass electron-crystal (PGEC) behaviour is realised in La0.5Na0.5Ti1-xNbxO3 thermoelectric oxides. The vibrational disorder imposed by the presence of both La3+ and Na+ cations on the A site of the ABO(3) perovskite oxide La0.5Na0.5TiO3 produces a phononglass with a thermal conductivity, kappa, 80% lower than that of SrTiO3 at room temperature. Unlike other state-of-the-art thermoelectric oxides, where there is strong coupling of kappa to the electronic power factor, the electronic transport of these materials can be optimised independently of the thermal transport through cation substitution at the octahedral B site. The low kappa of the phonon-glass parent is retained across the La0.5Na0.5Ti1-xNbxO3 series without disrupting the electronic conductivity, affording PGEC behaviour in oxides.