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Isotropic nearly zero thermal expansion (i.e., negligible volume change) is reported in a large temperature range for FeCo(CN)6, a member of the Prussian blue family with electronically active metal sublattices and a cubic framework structure built by a cyanide-bridged network of octahedral units. Suitable selection of metal ions and interstitial units could allow such anomalous thermal behavior to be combined with the variety of unusual electronic, optical, and magnetic properties exhibited by Prussian blue analogues.
Margadonna et al. (Sat,) studied this question.