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Volume 40 Issue 10
Oct 2026
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Chinese Journal of High Pressure Physics  > 2026  >  40(10): 101103.
QIAN Chao, QI Wenming, MATTURSUN Abliz, HU Qingyang, WANG Yuanyuan, DONG Hongliang, CHEN Bin. Raman Scattering Study of Lattice Dynamics and Phase Transitions in Layered Perovskite Sr2Ta2O7 Ceramics under High Pressure[J]. Chinese Journal of High Pressure Physics, 2026, 40(10): 101103. doi: 10.11858/gywlxb.20251269
Citation: QIAN Chao, QI Wenming, MATTURSUN Abliz, HU Qingyang, WANG Yuanyuan, DONG Hongliang, CHEN Bin. Raman Scattering Study of Lattice Dynamics and Phase Transitions in Layered Perovskite Sr2Ta2O7 Ceramics under High Pressure[J]. Chinese Journal of High Pressure Physics, 2026, 40(10): 101103. doi: 10.11858/gywlxb.20251269
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Raman Scattering Study of Lattice Dynamics and Phase Transitions in Layered Perovskite Sr2Ta2O7 Ceramics under High Pressure

doi: 10.11858/gywlxb.20251269
  • 1.

    School of Energy and Materials, Shanghai Polytechnic University, Shanghai 201209, China

  • 2.

    Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China

  • 3.

    School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, Shandong, China

  • 4.

    Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200062, China

  • Received Date: 27 Nov 2025
  • Rev Recd Date: 25 Dec 2025
    • Available Online: 01 Jan 2026
  • Issue Publish Date: 22 Oct 2026
    Abstract
  • The strontium tantalate Sr2Ta2O7 is a ceramic with an orthogonal Cmcm space group. Due to its potential applications in the field of multiferroics, it has become a research hotspot in recent years. However, the regulatory mechanism and phase transition behavior of hydrostatic pressure on its complex lattice structure remain unclear, which, to some extent, limits the in-depth understanding of the “structure-property” relationship of this material. This study systematically investigates the lattice dynamic response characteristics of orthogonal Cmcm Sr2Ta2O7 under high pressure up to 30 GPa by using in-situ high-pressure Raman spectroscopy, marking the highest pressure on this system to date. The results manifest that when the pressure reaches 5 GPa, significant changes occur in the Raman vibrational modes of the material. This phenomenon is attributed to a commensurate-to-incommensurate structural transition induced by symmetry breaking, consistent with previous research findings on Sr2Ta2O7. As the pressure further increasing to 20 GPa, a second phase transition may occur, which is identified as a first-order phase transition closely related to lattice disordering. However, the specific crystal structure of this high-pressure phase remains to be further confirmed in future studies. The Raman spectroscopy analysis suggests that the structural distortion of this high-pressure phase may follow a transformation pathway from orthogonal to monoclinic.

     

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