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Study on Elastic Properties and Phase Transition Behavior of Condensed Matters by Using Brillouin Light Scattering Spectroscopy
New Physics: Sae Mulli
Published online November 6, 2017;  
© 2017 New Physics: Sae Mulli.

Jae-Hyeon Ko*
Received October 10, 2017; Revised November 3, 2017; Accepted November 6, 2017.
Abstract
Brillouin spectroscopy is one of the inelastic laser light scattering spectroscopies and used to probe long-wavelength low-energy excitation processes in the characteristic frequency ranges of a few tens of gigahertz. Based on this technique, the velocities of acoustic waves in amorphous materials, such as polymers and liquids, and the energies and elastic constants of acoustic phonon modes in crystals, can be determined accurately. Elastic property is one of the fundamental physical properties in condensed matters and it is sensitive to phase transitions and to changes in structure or composition. In this paper, we review the principles and measurement methods of Brillouin spectroscopy and their main applications. Especially, we discuss property data and related physics obtainable by Brillouin spectroscopy by investigating several application examples such as perovskite-structured oxide materials showing ferroelectricity or relaxor state, and amorphous materials including polymers.


December 2017, 67 (12)
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