Issue 37, 2022

Octahedral tilting in Prussian blue analogues


Octahedral tilting is key to the structure and functionality of perovskites. We present a metastudy of published literature showing how these distortions manifest in the related Prussian blue analogues (PBAs): cyanide versions of double perovskites with formula AM[M′(CN)6]1−yy·nH2O (A = alkali metal, M and M′ = transition metals, □ = vacancy/defect). Tilts are favoured by high values of x if A = Na or K, whereas the transition metals play a less important role. External hydrostatic pressure induces tilt transitions nearly irrespective of the stoichiometry, whereas thermal transitions are only reported for x > 1. Interstitial water can alter the transitions induced by a different stimulus, but (de)hydration per se does not lead to tilts. Finally, the implications for rational design of critical functionality—including improper ferroelectricity and electrochemical performance—are discussed. The results are integral for a fundamental understanding of phase transitions and for the development of functional materials based on PBAs.

Graphical abstract: Octahedral tilting in Prussian blue analogues

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Article information

Article type
01 Mar 2022
22 Mar 2022
First published
22 Mar 2022
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2022,10, 13690-13699

Octahedral tilting in Prussian blue analogues

H. L. B. Boström and W. R. Brant, J. Mater. Chem. C, 2022, 10, 13690 DOI: 10.1039/D2TC00848C

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