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• W2963097972 abstract "Magnesium-rich silicates are ubiquitous both terrestrially and astronomically, where they are often present as small particles. Nanosized Mg-rich silicate particles are likely to be particularly important for understanding the formation, processing, and properties of cosmic dust grains. Although astronomical observations and laboratory studies have revealed much about such silicate dust, our knowledge of this hugely important class of nanosolids largely rests on top-down comparisons with the properties of bulk silicates. Herein, we provide a foundational bottom-up study of the structure and properties of Mg-rich nanosilicates based on carefully procured atomistic models. Specifically, we employ state-of-the-art global optimization methods to search for the most stable structures of silicate nanoclusters with olivine (Mg2SiO4) N and pyroxene (MgSiO3) N compositions with N = 1-10. To ensure the reliability of our searches, we develop a new interatomic potential that has been especially tuned for nanosilicates. Subsequently, we refine these searches and calculate a range of physicochemical properties of the most stable nanoclusters using accurate density functional theory based electronic structure calculations. We report a detailed analysis of structural and energy properties, charge distributions, and infrared vibrational spectra, where in all cases we compare our finding for nanosilicates with those of the corresponding bulk silicate crystals. For most properties considered, we find large differences with respect to the bulk limit, underlining the limitations of a top-down approach for describing these species. Overall, our work provides a new platform for an accurate and detailed understanding of nanoscale silicates." @default.
• W2963097972 created "2019-07-30" @default.
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• W2963097972 date "2019-07-19" @default.
• W2963097972 modified "2023-10-15" @default.
• W2963097972 title "Structure and Properties of Nanosilicates with Olivine (Mg₂SiO₄)_<i>N</i> and Pyroxene (MgSiO₃)_<i>N</i> Compositions" @default.
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• W2963097972 doi "https://doi.org/10.1021/acsearthspacechem.9b00139" @default.
• W2963097972 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7009040" @default.
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• W2963097972 hasPublicationYear "2019" @default.
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