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报告题目：Phase transition sequence of binary and pseudo-binary oxides upon compression

报告嘉宾：刘浩喆，北京高压科学研究中心 教授

报告时间：2026年6月5日 10:00

报告地点：av网站 中心校区唐敖庆楼B区521报告厅

主持人：钟鑫

报告摘要

In this presentation, the collaborations between various teams in Jilin University will be highlighted, and selected cases will be introduced from the Jilin University alumni cooperation work and beyond. To reveal the pressure induced phase transitions sequence patterns in several typical binary oxide and pseudo-binary oxide systems, the in situ high pressure synchrotron X-ray diffraction (XRD) experiments were carried out. The potential universal phase transitions pathway was proposed upon strong compression, i. e. when static pressure reach region of 100 ~ 900 GPa. Other type of modifications to tune the phase stability and transition behaviours under high pressure will be introduce. Such as the gradient doping of Nb element to nano CeO2, inducing a sluggish continuing transition to orthorhombic phase during compression and enhanced the higher pressure phase in decompression process. This phase transition behaviour deepens our understanding of the physical and chemical properties of doped nanomaterials. Another route of modification is single-phase oxides composed of muti-elements developed from the concept of high entropy alloys. The compositional flexibility provides infinite possibilities for the application of high entropy oxides (HEOs) in various fields. By taking advantage of the potential cocktail effect of HEOs, we designed and synthesized rutile-type HEO by solid-phase reaction method. to reveal their disorder, local lattice strain, and entropy features. Although the structural transition under high pressure of conventional rutile TiO2 has been extensively studied, the influence of multiple composition on the structural transition pathways of rutile-type HEO under high pressure conditions offers us new opportunity to discover the new phase transition sequence upon compression.

嘉宾简介

　　Prof. Dr. Arthur Haozhe Liu is staff scientist at the Center for High Pressure Science & Technology Advanced Research (HPSTAR) since 2014. He graduated from Jilin University, China in 1991, and received his Ph. D from Institute of Metal Research, CAS in 1997. He had working experience on high pressure projects at following institutions: Harbin Institute of Technology, China (2007-2014), HPCAT at APS, Carnegie Institution of Washington/Argonne National Laboratory (2003-2007); Mineral Physics Institute, Stony Brook University/X17 Beamline, NSLS, Brookhaven National Laboratory (2002-2003); Max Planck Institute for Solid State Research (2000-2001); and Institute of Physics, CAS (1997-1999). Prof. Liu served as co-chair in the AIRAPT-26 Conference in 2017, and LAM-15 Conference in 2013, respectively. He also served as the Chair of IUCr High Pressure Commission during 2017-2021, and executive committee member of AIRAPT during 2017-2023. He currently served as co-editor of Journal of Applied Crystallography, and Acting Chair of Asian Conference of High Pressure Research.

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