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고재현,Anwar Hushur,Bryan C. Sih,Do Han Kim,Jong Pil Kim,Min-Su Jang,Seiji Kojima,Zuo-Guang Ye 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Elastic properties of bismuth layered perovskite compounds, LaxBi4..xTi3O12 (LBT-x) and SrBi2Ta2O9 (SBT), were examined at room temperature by Brillouin scattering. Elastic stiness coecients, c33 and c44, dened in the pseudotetragonal symmetry, were obtained. The longitudinal sound velocities propagating along the c axis, were 3985 m/s and 3118 m/s for the pure bismuth titanate (BTO) and SBT, respectively. The sound velocity of SBT is very slow and is believed to be related with the weak interlayer bonding of this layer-structure compound. A simple linear chain model showed that the dierence in the sound velocity between BTO and SBT is mainly due to the dierence in the c axis lattice constant. The sound velocity of LBT-x increased slightly with the increase of x, while c33 seems to be insensitive to x.