Studying the initial stage of nucleation with low-frequency Raman scattering
The Institute of Geology and Mineralogy, Russian Academy of Sciences - Novosibirsk, 630090, Russia
Accepted: 4 July 2010
The objective of this paper is to show that low-frequency Raman scattering appears to be a sensitive method for the investigation of the initial stage of nucleation in multi- and mono-component systems. In the case of the mono-component systems, when the crystalline nuclei do not have an acoustic mismatch as compared to the amorphous matrix, we cannot observe their surface vibrations, but we can make use of the fact that in nucleation there is a jump in a structure correlation length. This results in a sharp decrease in contribution to the density of the acoustic vibration states because of decreasing the concentration of structural correlations on which acoustic phonons are localized. In addition, low-frequency Raman spectroscopy may be useful in the research into the phase transformation in materials for phase-change memories.
PACS: 63.22.-m – Phonons or vibrational states in low-dimensional structures and nanoscale materials / 78.30.Ly – Infrared and Raman spectra: Disordered solids / 63.50.-x – Vibrational states in disordered systems
© EPLA, 2010