Compositional dependence of anomalous thermal expansion in perovskite-like ABX

DOI: 10.1039/C5DT03263F
PMID: 26477747

Authors: Ines E. Collings (University of Oxford) , Joshua A. Hill (University of Oxford) , Andrew B. Cairns (University of Oxford) , Richard I. Cooper (University of Oxford) , Amber L. Thompson (University of Oxford) , Julia E. Parker (Diamond Light Source) , Chiu C. Tang (Diamond Light Source) , Andrew L. Goodwin (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Dalton Transactions

State: Published (Approved)
Published: October 2015
Diamond Proposal Number(s): 7907

Abstract: The compositional dependence of thermal expansion behaviour in 19 different perovskite-like metal–organic frameworks (MOFs) of composition [AI][MII(HCOO)3] (A = alkylammonium cation; M = octahedrally-coordinated divalent metal) is studied using variable-temperature X-ray powder diffraction measurements. While all systems show essentially the same type of thermomechanical response—irrespective of their particular structural details—the magnitude of this response is shown to be a function of AI and MII cation radii, as well as the molecular anisotropy of AI. Flexibility is maximised for large MII and small AI, while the shape of AI has implications for the direction of framework hingeing.

Subject Areas: Chemistry, Materials


Instruments: I11-High Resolution Powder Diffraction