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High-pressure/high-temperature phase diagram of zinc

DOI: 10.1088/1361-648X/aacac0 DOI Help

Authors: Daniel Errandonea (Universidad de Valencia) , Simon Macleod (AWE plc) , Javier Ruiz-fuertes (DCITIMAC, Universidad de Cantabria) , L. Burakovsky (Los Alamos National Laboratory) , Malcolm Mcmahon (University of Edinburgh) , Craig Wilson (AWE Plc) , Jordi Ibañez (Institute of Earth Sciences Jaume Almera, CSIC) , Dominik Daisenberger (Diamond Light Source) , Catalin Popescu (Synchrotron Light Facility, ALBA)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter

State: Published (Approved)
Published: June 2018
Diamond Proposal Number(s): 19846

Open Access Open Access

Abstract: 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 √3 (≈10 GPa) is not affected by temperature. When this ideal 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 can 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 by using a Simon–Glatzel equation. 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.

Journal Keywords: Zinc; x-ray diffraction; ab initio calculations; high pressure; high temperature; phase transition; equation of state; melting

Subject Areas: Physics


Instruments: I15-Extreme Conditions

Other Facilities: ALBA

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