High-pressure/high-temperature phase diagram of zinc
Errandonea, Daniel (Universitat de València. Departament de Física Aplicada i Electromagnetisme)
Macleod, S. G. (University of Edinburgh. Centre for Science at Extreme Conditions)
Ruiz-Fuertes, J. (Universidad de Cantabria)
Burakovsky, L. (Los Alamos National Laboratory)
McMahon, M. I. (University of Edinburgh. Centre for Science at Extreme Conditions)
Wilson, C. W. (Atomic Weapons Establishment)
Ibáñez-Insa, Jordi (Consejo Superior de Investigaciones Científicas (Espanya). Institut de Ciències de la Terra Jaume Almera)
Daisenberger, D. (Harwell Science and Innovation Campus. Diamond Light Source Ltd)
Popescu, Catalin (ALBA Laboratori de Llum de Sincrotró)

Data:	2018
Resum:	The phase diagram of zinc (Zn) has been explored up to 140 GPa and 6000 K, by combining optical observations, x-ray diffraction, and ab initio calculations. In the pressure range covered by this study, Zn is found to retain a hexagonal close-packed (hcp) crystal symmetry up to the melting temperature. The known decrease of the axial ratio (c/a) of the hcp phase of Zn under compression is observed in x-ray diffraction experiments from 300 K up to the melting temperature. The pressure at which c/a reaches (≈10 GPa) is slightly affected by temperature. When this axial ratio is reached, we observed that single crystals of Zn, formed at high temperature, break into multiple poly-crystals. In addition, a noticeable change in the pressure dependence of c/a takes place at the same pressure. Both phenomena could be caused by an isomorphic second-order phase transition induced by pressure in Zn. The reported melt curve extends previous results from 24 to 135 GPa. The pressure dependence obtained for the melting temperature is accurately described up to 135 GPa by using a Simon-Glatzel equation: where P is the pressure in GPa. The determined melt curve agrees with previous low-pressure studies and with shock-wave experiments, with a melting temperature of 5060(30) K at 135 GPa. Finally, a thermal equation of state is reported, which at room-temperature agrees with the literature.
Ajuts:	Ministerio de Economía y Competitividad MAT2016-75586-C4-1-P Ministerio de Economía y Competitividad MAT2015-71070-REDC
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Zinc ; X-ray diffraction ; Ab initio calculations ; High pressure ; High temperature ; Phase transition ; Melting
Publicat a:	Journal of Physics Condensed Matter, Vol. 30, Núm. 29 (July 2018) , art. 295402, ISSN 1361-648X

DOI: 10.1088/1361-648X/aacac0

9 p, 2.2 MB

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