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Nature 443, 320-323 (21 September 2006) | doi:10.1038/nature05145;

Open Innovation Challenges

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A guest-free germanium clathrate

The challenges associated with synthesizing expanded semiconductor frameworks with cage-like crystal structures continue to be of interest. Filled low-density germanium and silicon framework structures have distinct properties that address important issues in thermoelectric phonon glass–electron crystals, superconductivity and the possibility of Kondo insulators.

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