Phonon-glass electron-crystal (PGEC) behaviour is realised in La_0.5Na_0.5Ti_1−xNb_xO₃ thermoelectric oxides. The vibrational disorder imposed by the presence of both La³⁺ and Na⁺ cations on the A site of the ABO₃ perovskite oxide La_0.5Na_0.5TiO₃ produces a phonon-glass with a thermal conductivity, κ, 80% lower than that of SrTiO₃ at room temperature. Unlike other state-of-the-art thermoelectric oxides, where there is strong coupling of κ 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 κ of the phonon-glass parent is retained across the La_0.5Na_0.5Ti_1−xNb_xO₃ series without disrupting the electronic conductivity, affording PGEC behaviour in oxides.

中文翻译：

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n型热电氧化物中声子玻璃电子晶体行为的位错

在La _0.5 Na _0.5 Ti _{1- x} Nb _x O ₃热电氧化物中实现了声子玻璃电子晶体（PGEC）行为。在ABO ₃钙钛矿氧化物La _0.5 Na _0.5 TiO ₃的A位置上同时存在La ³⁺和Na ⁺阳离子而引起的振动紊乱产生了一种声子玻璃，其导热率κ，比导热率κ低80％。 SrTiO ₃在室温下。与其他现有技术的热电氧化物不同，其中κ具有很强的耦合性对于电子功率因数，可以通过八面体B位置的阳离子取代，独立于热传递而优化这些材料的电子传递。整个La _0.5 Na _0.5 Ti _{1- x} Nb _x O ₃系列中均保留了低κ的声子玻璃母体，而不会破坏电子导电性，从而提供了氧化物中的PGEC行为。