Steenbergen KG, Mewes JM, Pašteka LF, Gäggeler HW, Kresse G, Pahl E, Schwerdtfeger P. The cohesive energy of superheavy element copernicium determined from accurate relativistic coupled-cluster theory.
Phys Chem Chem Phys 2018;
19:32286-32295. [PMID:
29199301 DOI:
10.1039/c7cp07203a]
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Abstract
The cohesive energy of bulk copernicium is accurately determined using the incremental method within a relativistic coupled-cluster approach. For the lowest energy structure of hexagonal close-packed (hcp) symmetry, we obtain a cohesive energy of -36.3 kJ mol-1 (inclusion of uncertainties leads to a lower bound of -39.6 kJ mol-1), in excellent agreement with the experimentally estimated sublimation enthalpy of -38 kJ mol-1 [R. Eichler et al., Angew. Chem. Int. Ed., 2008, 47, 3262]. At the coupled-cluster singles, doubles and perturbative triples level of theory, we find that the hcp structure is energetically quasi-degenerate with both face-centred and body-centred cubic structures. These results provide a basis for testing various density-functionals, of which the PBEsol functional yields a cohesive energy of -34.1 kJ mol-1 in good agreement with our coupled-cluster value.
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