论文标题
发现具有超速导热系数的金属氧化物
Discovery of a metallic oxide with ultralow thermal conductivity
论文作者
论文摘要
具有金属电导率的化合物通常具有相当大的总热导率，因为电子和光子都有助于热传输。在这里，我们展示了氧化虹膜BI3IR3O11的一个特殊例子，该例子同时显示金属电导率和300 K处的0.61 W M-1 K-1的超速导热性。该化合物结晶成具有空间组PN-3的立方结构框架。边缘和角共享IRO6八面体，带有混合IR4.33+电荷状态偏向金属电气传输。 Bi3IR3O11由于其类似隧道的结构，内部有充满的沉重原子Bi嘎嘎作响，因此在理论上表现出极低的晶格导热率，接近最小限制。理论计算揭示了金属电导率和超动导热率之间非凡兼容性的基本机制。这项研究可能会为设计和开发前所未有的热进行热的金属建立新的途径。
A compound with metallic electrical conductivity usually has a considerable total thermal conductivity because both electrons and photons contribute to thermal transport. Here, we show an exceptional example of iridium oxide, Bi3Ir3O11, that concurrently displays metallic electrical conductivity and ultralow thermal conductivity approaching 0.61 W m-1 K-1 at 300 K. The compound crystallizes into a cubic structural framework with space group Pn-3. The edge- and corner-sharing IrO6 octahedra with a mixed Ir4.33+ charge state favor metallic electrical transport. Bi3Ir3O11 exhibits an extremely low lattice thermal conductivity close to the minimum limit in theory owing to its tunnel-like structure with filled heavy atoms Bi rattling inside. Theoretical calculations reveal the underlying mechanisms for the extraordinary compatibility between metallic electrical conductivity and ultralow thermal conductivity. This study may establish a new avenue for designing and developing unprecedented heat-insulation metals.
