Melting of magnesium oxide up to two terapascals using double-shock compression

Hansen, L. E.; Fratanduono, D. E.; Zhang, S.; Hicks, D. G.; Suer, T.; Sprowal, Z. K.; Huff, M. F.; Gong, X.; Henderson, B. J.; Polsin, D. N.; Zaghoo, M.; Hu, S. X.; Collins, G. W.; Rygg, J. R.

doi:10.1103/physrevb.104.014106

Title: Melting of magnesium oxide up to two terapascals using double-shock compression

Journal Article · 12 July 2021 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.104.014106 · OSTI ID:1814451

^[1]; Fratanduono, D. E. ^[2];

^[3];

^[4]; Suer, T. ^[5]; Sprowal, Z. K. ^[6]; Huff, M. F. ^[6]; Gong, X. ^[6]; Henderson, B. J. ^[6]; Polsin, D. N. ^[6]; Zaghoo, M. ^[3];

^[6]; Collins, G. W. ^[6]; Rygg, J. R. ^[6]

Lab. for Laser Energetics, Rochester, NY (United States); Univ. of Rochester, NY (United States); Laboratory for Laser Energetics, University of Rochester
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lab. for Laser Energetics, Rochester, NY (United States)
Swinburne Univ. of Technology, Victoria (Australia)
Lab. for Laser Energetics, Rochester, NY (United States); Harvard Univ., Cambridge, MA (United States)
Lab. for Laser Energetics, Rochester, NY (United States); Univ. of Rochester, NY (United States)

Constraining the melting behavior of magnesium oxide, a major constituent of gaseous and rocky planets, is key to benchmarking their evolutionary models. Using a double-shock technique, we extended the MgO melt curve measurements to 2 TPa; this is twice the pressure achieved by previous melting experiments on any material. A temperature plateau is observed between 1218 and 1950 GPa in the second shock states, which is attributed to latent heat of melting. At 1950 GPa, the measured melting temperature is 17,600 K, 17% lower than recent theoretical predictions. Furthermore, the melting curve is steeper than that of MgSiO₃, indicating that MgO is likely solid in the interior of Saturn-sized gas giants and extra-solar super-Earth planets.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; NA0003856

OSTI ID:: 1814451

Report Number(s):: LLNL-JRNL-820434; 2021-19, 1657, 2614

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Melting of magnesium oxide up to two terapascals using double-shock compression

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