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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on SmP5 by Materials Project

SmP5 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Sm3+ is bonded in a 8-coordinate geometry to eight P+0.60- atoms. There are a spread of Sm–P bond distances ranging from 2.99–3.05 Å. There are three inequivalent P+0.60- sites. In the first P+0.60- site, P+0.60- is bonded to two equivalent Sm3+ and two P+0.60- atoms to form a mixture of corner and edge-sharing PSm2P2 tetrahedra. There are one shorter (2.17 Å) and one longer (2.22 Å) P–P bond lengths. In the second P+0.60- site, P+0.60- is bonded to two equivalent Sm3+ and two equivalent P+0.60- atoms to form distorted corner-sharing PSm2P2 tetrahedra. Both P–P bond lengths are 2.22 Å. In the third P+0.60- site, P+0.60- is bonded to one Sm3+ and three P+0.60- atoms to form distorted PSmP3 tetrahedra that share corners with nine PSm2P2 tetrahedra and an edgeedge with one PSmP3 tetrahedra. The P–P bond length is 2.21 Å.

36 MATERIALS SCIENCE↗
NASA NTRS2006

Effects of Kinetic Processes in Shaping Io's Global Plasma Environment: A 3D Hybrid Model

The global dynamics of the ionized and neutral gases in the environment of Io plays an important role in the interaction of Jupiter s corotating magnetospheric plasma with Io. Stationary simulations of this problem have already been done using the magnetohydrodynamics (MHD) and the electrodynamics approaches. One of the major results of recent simplified two-fluid model simulations [Saur, J., Neubauer, F.M., Strobel, D.F., Summers, M.E., 2002. J. Geophys. Res. 107 (SMP5), 1-18] was the production of the structure of the double-peak in the magnetic field signature of the Io flyby. These could not be explained before by standard MHD models. In this paper, we present a hybrid simulation for Io with kinetic ions and fluid electrons. This method employs a fluid description for electrons and neutrals, whereas for ions a particle approach is used. We also take into account charge-exchange and photoionization processes and solve self-consistently for electric and magnetic fields. Our model may provide a much more accurate description for the ion dynamics than previous approaches and allows us to account for the realistic anisotropic ion velocity distribution that cannot be done in fluid simulations with isotropic temperatures. The first results of such a simulation of the dynamics of ions in Io s environment are discussed in this paper. Comparison with the Galileo IO flyby results shows that this approach provides an accurate physical basis for the interaction and can therefore naturally reproduce all the observed salient features.

Lipatov, Alexander S.↗