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Materials science

Zero-expansion plan

Some materials don't expand or contract as they are heated. A new example is a metallic compound, for which the movement of electrons between atoms is the likely explanation for its 'zero thermal expansion'.

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Figure 1: The anharmonic potential well.
Figure 2: Valence degeneracy and ion size.

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Sleight, A. Zero-expansion plan. Nature 425, 674–676 (2003). https://doi.org/10.1038/425674a

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