Cora Lind-Kovacs’s favorite structure is:

ZrW2O8

ZrW2O8

Source: CrystalMaker

Why?

The determination of the crystal structure of ZrW2O8 in the 1990's revealed the origins of a fairly widespread mechanism of negative thermal expansion. The structure is composed of relatively rigid, corner-sharing
polyhedra, and transverse vibrations of the approximately linearly coordinated oxygen atoms result in the overall contraction of the structure.—Cora Lind-Kovacs

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