Nano Archive

Pressure-Induced Structural Phase Transformations in Silicon Nanowires

Poswal, H. K. and Garg, Nandini and Sharma, Surinder M. and Busetto, E and Sikka, S. K. and Gundiah, Gautam and Deepak, F. Leonard and Rao, C. N. R. (2005) Pressure-Induced Structural Phase Transformations in Silicon Nanowires. Journal of NANOSCIENCE and NANOTECHNOLOGY, 5 (5). pp. 729-732.

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Abstract

High-pressure structural behavior of silicon nanowires is investigated up to ∼22 GPa using angle dispersive X-ray diffraction measurements. Silicon nanowires transform from the cubic to the β-tin phase at 7.5–10.5 GPa, to the Imma phase at ∼14 GPa, and to the primitive hexagonal structure at ∼16.2 GPa. On complete release of pressure, it transforms to the metastable R8 phase. The observed sequence of phase transitions is the same as that of bulk silicon. Though the X-ray diffraction experiments do not reveal any size effect, the pressure dependence of Raman modes shows that the behavior of nanowires is in between that of the bulk crystal and porous Si.

Item Type:Article
Subjects:Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3629
Deposited By:JNCASR
Deposited On:19 Jan 2009 09:16
Last Modified:02 Mar 2009 09:46

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