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Potassium under Pressure: A Pseudobinary Ionic Compound

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Original languageEnglish
Article number115501
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Issue number11
Publication statusPublished - 11 Sep 2009


Experimentally, we have found that among the "complicated'' phases of potassium at intermediate pressures is one which has the same space group as the double hexagonal-close-packed structure, although its atomic coordination is completely different. Calculations on this P6(3)/mmc (hP4) structure as a function of pressure show three isostructural transitions and three distinctive types of chemical bonding: free electron, ionic, and metallic. Interestingly, relationships between localized metallic structures and ionic compounds are found.

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