Radiation effects, zero thermal expansion, and pressure-induced phase transition in CsMnCo(CN)6

The Prussian blue analogue CsMnCo(CN)(6) is studied using powder X-ray and neutron diffraction under variable temperature, pressure, and X-ray exposure. It retains cubic F43m symmetry in the range 85-500 K with minimal thermal expansion, whereas a phase transition to P4n2 occurs at similar to 2 GPa, driven by octahedral tilting. A small lattice contraction occurs upon increased X-ray dose. Comparisons with related systems indicate that the Cs-I ions decrease the thermal expansion and suppress the likelihood of phase transformations. The results improve the understanding of the stimuli-responsive behaviour of coordination polymers.

Automated summary

In this study, the Prussian blue analogue CsMnCo(CN)(6) was investigated using powder X-ray and neutron diffraction under variable temperature, pressure, and X-ray exposure. The results revealed the structural changes of the material under different conditions and indicated that Cs-I ions play an important role in controlling the thermal expansion and phase transformations of Prussian blue.