Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (9): 20260234.doi: 10.7503/cjcu20260234

• Review • Previous Articles    

In-Situ High-pressure Characterization Techniques and Research on Pressure-induced Phase Transition Materials

PEI Tianyao1, WANG Yonggang2(), YUE Binbin1   

  1. 1.Center for High Pressure Science and Technology Advanced Research(HPSTAR),Beijing 100094,China
    2.School of Materials Science and Engineering,Peking University,Beijing 100871,China
  • Received:2026-06-10 Online:2026-09-10 Published:2026-07-20
  • Contact: WANG Yonggang E-mail:ygw@pku.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2023YFA1608804)

Abstract:

High-pressure-induced structural phase transitions constitute a crucial pathway for discovering new phases and understanding material behaviors under extreme conditions. However, the transition pathways, intermediate states, and dynamics have long remained in a "black box", necessitation in situ probing techniques for elucidation. This article reviews the recent progress in in situ probing techniques and mechanistic studies of structural phase transitions in high-pressure solid-state chemistry. First, the principles and applicable scopes of in situ characterization methods are introduced according to information levels, including X-ray diffraction, neutron diffraction, X-ray absorption fine structure, pair distribution function, Raman spectroscopy, infrared spectroscopy, ultraviolet-visible absorption spectroscopy, fluorescence spectroscopy, and second harmonic generation. Emerging directions such as ultrafast time-resolved techniques and machine-learning-assisted data analysis are also discussed. Second, using displacive phase transitions(SrTiO3), reconstructive phase transitions(graphite-diamond, Co3P2O8), pressure-induced amorphization(ice), isostructural phase transitions(Ce), and order-disorder phase transitions(IMMH y PbBr4) as representative examples, we demonstrate how in situ techniques reveal the microscopic mechanisms of pressure-driven structural evolution. Finally, current bottlenecks in time resolution and data interpretation are summarized, and future directions including multi-technique integration, ultrafast probing, and machine learning are prospected.

Key words: Pressure-induced phase transition, In-situ characterization, Diamond anvil cell(DAC), Synchrotron radiation

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