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The ice layer in Uranus and Neptune—diamonds in the sky?

Abstract

Many of the current models of Uranus and Neptune postulate a three-layer structure, consisting of an inner rocky core, a middle ‘ice’ layer of fluid, H2O, CH4, NH3 and an outer hydrogen–helium layer of solar composition1. The estimated pressures and temperatures of the ice layer ranges from about 6Mbar and 7,000 K at the inner core-ice boundary, to 0.2 Mbar and 2,200 K at the outer ice/hydrogen–helium boundary. I point out here that shockwave experiments on these liquids2–5, as well as theoretical studies5–7, imply that the H2O and NH3 in the ice layer are almost totally ionized and the CH4 has been pyrolysed to carbon, possibly in the metallic or diamond form8,9.

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References

  1. Hubbard, W. B. & McFarland, J. J. J. geophys. Res. 85, 225 (1980).

    Article  ADS  CAS  Google Scholar 

  2. Mitchell, A. C. & Nellis, W. J. in High Pressure Science and Technology Vol. 1 (eds Timmerhans, K. D. & Barber, M. S.) 428 (Plenum, New York, 1980).

    Google Scholar 

  3. Mitchell, A. C., Kovel, M. I., Nellis, W. J. & Keeler, R. N. in High Pressure Science and Technology Vol. 2 (eds Vodar, B. & Marteau, P.) 1048 (Pergamon, Oxford, 1980).

    Google Scholar 

  4. Nellis, W. J., Mitchell, A. C., Ross, M. & van Thiel, M. in High Pressure Science and Technology Vol. 2 (eds Vodar, B. & Marteau, P.) 1043 (Pergamon, Oxford, 1980).

    Google Scholar 

  5. Nellis, W. J., Ree, F. H., van Thiel, M. & Mitchell, A. C. J. chem. Phys. (submitted).

  6. Ross, M. & Ree, F. H. J. chem. Phys. 73, 6146 (1980).

    Article  ADS  CAS  Google Scholar 

  7. Ree, F. H. J. chem. Phys. 70, 974 (1979).

    Article  ADS  CAS  Google Scholar 

  8. Grover, R. J. chem. Phys. 71, 3824 (1979).

    Article  ADS  CAS  Google Scholar 

  9. Van Vechten, J. A. Phys. Rev. B 7, 1479 (1973).

    Article  ADS  CAS  Google Scholar 

  10. Brown, W. L. Astrophys. J. Lett. 207, L209 (1976).

    Article  ADS  Google Scholar 

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Ross, M. The ice layer in Uranus and Neptune—diamonds in the sky?. Nature 292, 435–436 (1981). https://doi.org/10.1038/292435a0

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