fig4
![Transition from isotropic positive to negative thermal expansion by local Zr<sub>6</sub>O<sub>8</sub> node distortion in MOF-801](https://image.oaes.cc/b5f36c00-4c30-488c-b3e5-240bffc7afe2/microstructures3070.fig.4.jpg)
Figure 4. (A) PDF patterns of MOF-801 at 300 K (path 1: Zr-O atom pair, path 2: Zr···Zr atom pair, path 3: Zr···Zr atom pair). (B) Schematic diagram of the Zr6O8 node, showing paths 1, 2 and 3, respectively. (C) Temperature-dependent PDF patterns in the range of 1.5-5.5 Å. (D) Illustration of the local Zr6O8 node distortion with temperature.