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  • Title: Switching Between Giant Positive and Negative Thermal Expansions of a YFe(CN)6 -based Prussian Blue Analogue Induced by Guest Species.
    Author: Gao Q, Chen J, Sun Q, Chang D, Huang Q, Wu H, Sanson A, Milazzo R, Zhu H, Li Q, Liu Z, Deng J, Xing X.
    Journal: Angew Chem Int Ed Engl; 2017 Jul 24; 56(31):9023-9028. PubMed ID: 28594118.
    Abstract:
    The control of thermal expansion of solid compounds is intriguing but remains challenging. The effect of guests on the thermal expansion of open-framework structures was investigated. Notably, the presence of guest ions (K+ ) and molecules (H2 O) can substantially switch thermal expansion of YFe(CN)6 from negative (αv =-33.67×10-6  K-1 ) to positive (αv =+42.72×10-6  K-1 )-a range that covers the thermal expansion of most inorganic compounds. The mechanism of such substantial thermal expansion switching is revealed by joint studies with synchrotron X-ray diffraction, X-ray absorption fine structure, neutron powder diffraction, and density functional theory calculations. The presence of guest ions or molecules plays a critical damping effect on transverse vibrations, thus inhibiting negative thermal expansion. An effective method is demonstrated to control the thermal expansion in open-framework materials by adjusting the presence of guests.
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