Abstract
Atomic structures of amorphous silicate dusts with the MgSiO3 composition were simulated by molecular dynamics method as a function 0f the dust density based on the assumption that the density corresponds to cooling rate of dust formation. The SiO4 tetrahedra are more polymerized with decreasing density, suggesting phase separation between SiCO2-rich and MgO-rich components in less dense dusts formed by rapid condensation. A mode of atomic vibration probably due to the Si-0 bending is different in the amorphous silicates with different densities. This may cause changes of the 20 μm bands of IR spectra of silicate dusts with different cooling rates.
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References
Tielens, A. G. G. M. and Allamandola, L. J. (1987) ‘Evolution of interstellar dust’, in G. E. Morfill and M. Scholer (eds.), Physical Processes in Interstellar Clouds, D. Reidel Pub. Co., pp.333-376.
Dorschner, J., Friedemann, C., Gurtler, J. and Henning, T. (1988) ‘Optical properties of glassy bronzite and the interstellar silicate bands’, Astron. Astrophys. 198, 223–232.
Matsui, Y. and Kawamura, K. (1980) ‘Instantaneous structure of an MgSiO3 melt simulated by molecular dynamics’ Nature 285, 648–649.
Koike, C. and Hasegawa, H. (1987) ‘Mid-infrared extinction coefficients of amorphous silicates’, Astrophys. Space Sci. 134, 361–379.
Kawamura, K. (1991) ‘Interatomic potential models for molecular dynamics simulations of multi-component oxides’, in F. Yonezawa (ed.), Molecular Dynamics Simulations, Springer Series in Solid State Sciences (in press).
Koike, C. and Tsuchiyama, A. (1991) ‘The infrared spectra of synthesized amorphous silicates of olivine and pyroxene’, this volume.
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© 1991 Springer Science+Business Media Dordrecht
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Tsuchiyama, A., Kawamura, K. (1991). Structures of Amorphous Silicate Dusts Simulated by Molecular Dynamics Method. In: Levasseur-Regourd, A.C., Hasegawa, H. (eds) Origin and Evolution of Interplanetary Dust. Astrophysics and Space Science Library, vol 173. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3640-2_24
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DOI: https://doi.org/10.1007/978-94-011-3640-2_24
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-5616-8
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