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Chinese Journal of High Pressure Physics  > 1992  >  6(3): 206-211 .
MENG Jin-Fang, ZOU Guang-Tian, CUI Qi-Liang, ZHAO Yong-Nian, LI Dong-Mei. A Study of Raman Spectra and the Soft Mode Phase Transition under Hydrostatic Pressure in Ba2-xLaxTi4O11[J]. Chinese Journal of High Pressure Physics, 1992, 6(3): 206-211 . doi: 10.11858/gywlxb.1992.03.007
Citation: MENG Jin-Fang, ZOU Guang-Tian, CUI Qi-Liang, ZHAO Yong-Nian, LI Dong-Mei. A Study of Raman Spectra and the Soft Mode Phase Transition under Hydrostatic Pressure in Ba2-xLaxTi4O11[J]. Chinese Journal of High Pressure Physics, 1992, 6(3): 206-211 . doi: 10.11858/gywlxb.1992.03.007
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A Study of Raman Spectra and the Soft Mode Phase Transition under Hydrostatic Pressure in Ba2-xLaxTi4O11

doi: 10.11858/gywlxb.1992.03.007

  • State Key Laboratory for Superhard Materials, Institute of Atomic and Molecular Physics, Jilin University, Changchun 130023, China

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  • Corresponding author: MENG Jin-Fang
  • Received Date: 08 Apr 1992
  • Rev Recd Date: 05 Jul 1992
  • Publish Date: 05 Sep 1992
    Abstract
  • The Raman spectra of Ba2-xLaxTi4O11 under hydrostatic pressure have been completed. The behavior of the coupled soft mode is found. Through comparing the result of Ba2Ti4O11 obtained by termodynamics with the experimental data, it is believed that the coupling is one between q0 soft optical phonon with Bg symmetry and a acoustic phonon mode. The phase transition occurring in Ba2-xLaxTi4O11 is a secondary order one driven by the soft mode.

     

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