Dr Livia Bove (Universit茅 P&M Curie, Universit脿 di Roma la Sapienza, and Ecole Politecnique Federale Lausanne)
New structures and exotic properties of ices and hydrates under planetary conditions
Compressed water, ices mixtures and hydrates are overspread on Earth at depth and in the extra-terrestrial space, both interstellar and on outer planets and moons [1-3]. Under the extreme p-T conditions experienced in these icy bodies ices and hydrates display a rich phase diagram, anomalous dynamical and thermal properties, proton conductivity, and enhanced quantum effects [4-8]. Methane and hydrogen hydrates are also expected to be present under very high pressures (10 to 200 GPa) in giant planetary interiors such as Uranus or Neptune. However, the stability of such structures at these extreme pressures is currently debated. In this talk I will review our recent experimental results - obtained combining neutron and x-ray diffraction, quasielastic neutron scattering, and Raman spectroscopy under high pressure with ab-initio simulations- on water, ice mixtures (NH3: H2O: CH4), and gas (H2, CH4) hydrates [5-12] under the extreme conditions experienced in the ice bodies of our solar system.
Acknowledgments: This work was supported by the Swiss National Science Fund under Grant 200021149487.
[1] L. E. Bove and U. Ranieri, Phil. Trans. R. Soc. A 377: 0262 (2019).
[2] S. Klotz, L. E. Bove et al. Nat. Mat. 8, 405 (2009).
[3] L. E. Bove, et al., PNAS 112, 8216 (2015).
[4] S. Klotz, et al., Sci. Rep. 6, 32040 (2016).
[5] U. L. Ranieri, et al., Nature Com., 8, 1076 (2017).
[6] S. Schaack, et al., JPC C 122 11159 (2018).
[7] U. L. Ranieri, et al. J. Phys. Chem. C, 123, 1888 (2019).
[8] S. Schaack, et al., PNAS 116, 33 (2019).
[9] U. L. Ranieri, et al., Nature Com. 12: 195 (2021).
[10] A. Toffano, et al., J. Chem. Phys. 157, 094502 (2022)
[11] H. Zhang, et al., J. Chem. Phys. Letters, in press (2023)
[12] M. Rescigno, et al., to be submlitted (2023).
New structures and exotic properties of ices and hydrates under planetary conditions
Compressed water, ices mixtures and hydrates are overspread on Earth at depth and in the extra-terrestrial space, both interstellar and on outer planets and moons [1-3]. Under the extreme p-T conditions experienced in these icy bodies ices and hydrates display a rich phase diagram, anomalous dynamical and thermal properties, proton conductivity, and enhanced quantum effects [4-8]. Methane and hydrogen hydrates are also expected to be present under very high pressures (10 to 200 GPa) in giant planetary interiors such as Uranus or Neptune. However, the stability of such structures at these extreme pressures is currently debated. In this talk I will review our recent experimental results - obtained combining neutron and x-ray diffraction, quasielastic neutron scattering, and Raman spectroscopy under high pressure with ab-initio simulations- on water, ice mixtures (NH3: H2O: CH4), and gas (H2, CH4) hydrates [5-12] under the extreme conditions experienced in the ice bodies of our solar system.
Acknowledgments: This work was supported by the Swiss National Science Fund under Grant 200021149487.
[1] L. E. Bove and U. Ranieri, Phil. Trans. R. Soc. A 377: 0262 (2019).
[2] S. Klotz, L. E. Bove et al. Nat. Mat. 8, 405 (2009).
[3] L. E. Bove, et al., PNAS 112, 8216 (2015).
[4] S. Klotz, et al., Sci. Rep. 6, 32040 (2016).
[5] U. L. Ranieri, et al., Nature Com., 8, 1076 (2017).
[6] S. Schaack, et al., JPC C 122 11159 (2018).
[7] U. L. Ranieri, et al. J. Phys. Chem. C, 123, 1888 (2019).
[8] S. Schaack, et al., PNAS 116, 33 (2019).
[9] U. L. Ranieri, et al., Nature Com. 12: 195 (2021).
[10] A. Toffano, et al., J. Chem. Phys. 157, 094502 (2022)
[11] H. Zhang, et al., J. Chem. Phys. Letters, in press (2023)
[12] M. Rescigno, et al., to be submlitted (2023).
