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  • Title: Tunable Thermal Expansion from Negative, Zero, to Positive in Cubic Prussian Blue Analogues of GaFe(CN)6.
    Author: Gao Q, Shi N, Sanson A, Sun Y, Milazzo R, Olivi L, Zhu H, Lapidus SH, Zheng L, Chen J, Xing X.
    Journal: Inorg Chem; 2018 Nov 19; 57(22):14027-14030. PubMed ID: 30376304.
    Abstract:
    The achievement of controlling thermal expansion is important for open-framework structures. The present work proposes a feasible way to adjust the coefficient of thermal expansion continuously from negative to positive via inserting guest Na+ ions or H2O molecules into a GaFe(CN)6 framework. The guest ions or molecules have an intense dampening effect on the transverse vibrations of CN atoms in the -Ga-N≡C-Fe- linkage, especially for the N atoms. This study demonstrates that electrochemical or redox intercalation of guest ions will be an effective way to tune thermal expansion in those negative thermal expansion open-framework materials induced by low-frequency phonons.
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