Figure 1 (IMAGE)
Caption
A schematic diagram. In intermetallic compounds with tunnel spaces in the crystal structure (Na-X-Sn compounds, where X is Al, Ga, In, or Zn), Na atoms in the tunnel vibrate (rattling) with large amplitude along the elongation direction of the tunnel, and the local interatomic distance of these Na atoms. It was found that the lattice thermal conductivity decreases in compounds where the local interatomic distance (dNa-Na) of these Na atoms is closer. This is a new mechanism of thermal conductivity reduction caused by the strong correlation of the atomic chain-like rattling atoms in the tunnel with each other.
Credit
Takahiro Yamada et al.
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License
CC BY