Compositional inhomogeneity and tuneable thermal expansion in mixed-metal ZIF-8 analogues
Research output: Contribution to journal › Article
Colleges, School and Institutes
- MRC Health Data Research UK (HDR UK), London, UK.
- University of Oxford
We study the structural and thermomechanical effects of cation substitution in the compositional family of metal–organic frameworks Zn1−xCdx(mIm)2 (HmIm = 2-methylimidazole). We find complete miscibility for all compositions x, with evidence of inhomogeneous distributions of Cd and Zn that in turn affect framework aperture characteristics. Using variable-temperature X-ray powder diffraction measurements, we show that Cd substitution drives a threefold reduction in the magnitude of thermal expansion behaviour. We interpret this effect in terms of an increased density of negative thermal expansion modes in the more flexible Cd-rich frameworks.
|Number of pages||4|
|Early online date||1 Aug 2018|
|Publication status||Published - 7 Sep 2018|