Abstract
The acoustic properties of Lithium Tetraborate Li2B4O7 have been studied by Brillouin scattering. In order to investigate the phase transition of this crystal, especially the existence of a new incommensurate phase (V. V. Zaretskii and Ya. V. Burak, Sov. Phys. Solid State, 31, 960 (1989)), temperature dependences of the Brillouin frequency shifts of the acoustic phonon modes were measured in the temperature range from room temperature to liquid nitrogen. These results did not show any anomaly in overall temperature range.