Noblest of all metals is structurally unstable at high pressure |
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Authors: | Dubrovinsky L Dubrovinskaia N Crichton W A Mikhaylushkin A S Simak S I Abrikosov I A de Almeida J S Ahuja R Luo W Johansson B |
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Institution: | Bayerisches Geoinstitut, Universit?t Bayreuth, D-95440 Bayreuth, Germany. |
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Abstract: | In a series of experiments in externally electrically heated diamond anvil cells we demonstrate that at pressures above approximately 240 GPa gold adopts a hexagonal-close-packed structure. Ab initio calculations predict that at pressures about 250 GPa different stacking sequences of close-packed atomic layers in gold become virtually degenerate in energy, strongly supporting the experimental observations. |
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