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• W3107657622 endingPage "27096" @default.
• W3107657622 startingPage "27089" @default.
• W3107657622 abstract "Pressure-induced phase transitions in various nanostructured Si have been studied extensively but still remain not well-understood. In this study, we systematically investigated the phase transitions in nanostructured Si with different sizes and morphology including large and small Si nanoparticles (SiNPs), Si nanowires (SiNWs), and porous Si using in situ high-pressure synchrotron X-ray diffraction and Raman microscopy. The large SiNPs show high-pressure behavior similar to bulk Si, while in the other three samples, the pressure of the first phase transition during compression is elevated. For small SiNPs and porous Si, the initial diamond cubic Si directly transforms to the simple hexagonal phase at ∼16.4 and ∼18.4 GPa during compression (instead of the β-Sn phase in bulk Si), respectively, and amorphous Si was obtained for both samples upon decompression. For SiNWs, the initial diamond cubic Si directly transforms to the Imma phase when compressed to ∼15.2 GPa, and a mixture of amorphous Si and a body-centered cubic phase was obtained upon decompression. Although seemingly diverse behavior was observed, our analysis reveals a unified picture for the various samples, i.e., phase transitions in nanostructured Si are mainly controlled by their domain size, while their morphology has a minor effect. The higher phase-transition pressure and the different phase-transition sequences in the small SiNPs, SiNWs, and porous Si during compression can mainly be attributed to the higher kinetic barrier of phase transformation in nanostructured Si." @default.
• W3107657622 created "2020-12-07" @default.
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• W3107657622 date "2020-11-25" @default.
• W3107657622 modified "2023-10-15" @default.
• W3107657622 title "Pressure-Induced Phase Transitions in Nanostructured Silicon" @default.
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• W3107657622 doi "https://doi.org/10.1021/acs.jpcc.0c07686" @default.
• W3107657622 hasPublicationYear "2020" @default.
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