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Nature 403, 836-837 (24 February 2000) | doi:10.1038/35002691;

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Crystal structure: As weird as they come

Most metals have simple structures, at least at normal pressures. A new high-pressure structure of the metal barium must be one of the weirdest ever. The structure consists of two parts, which are said to be |[lsquo]|incommensurate|[rsquo]| because they never fit together exactly.

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