The 6th International Conference on Matter and Radiation at Extremes (ICMRE2023)

131 / 2023-04-14 16:14:08

Deformation behavior and phase transition mechanisms of typical ceramics under high pressure

high pressure,radial diffraction,deformation bahavior,phase transition mechanism,ceramics

High Pressure Physics and Materials Science > Transitions

Investigation of the mechanical properties of minerals under high pressure, including the plastic and elastic deformation behavior as well as the rheology, is crucial for understanding the dynamic processes during Earth’s history that produce heterogeneity and anisotropy and has become of great interest to the geophysics community. On the other hand, the mechanical properties and phase transition mechanisms of functional ceramics under extreme compression are also of considerable importance to technological applications. Based on the technology of radial x-ray diffraction in a diamond anvil cell (rDAC-XRD), we have studied in situ the deformation behavior of several typical ceramic compounds under non-hydrostatic pressure and successfully revealed the texture evolution under pressure and the phase transition mechanism. For example, dominant slip systems and orientation relationships have been revealed in zircon-type compounds [1], and a simple variant selection effect has been observed during the cubic to orthorhombic phase transition in Mn₂O₃ [2]. MnO₂ was also studied as a representative system of the MO₂ family to understand the deformation and slip systems of the high-pressure CaCl₂-type phase [3]. Meanwhile, the deformation behavior of a typical high-entropy oxide, MgCoNiCuZnO, has also been explored and a possible slip system transition process is proposed in this system based on the lattice strain and texture evolution under high pressure [4].