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Pressure generation under deformation in a large-volume press

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Deformation can change the transition pathway of materials under high pressure,thus significantly affects physical and chemical properties of matters.However,accurate pressure calibration under deformation is challenging and thereby causes relatively large pressure uncertainties in deformation experiments,resulting in the synthesis of complex multiphase materials.Here,pressure generations of three types of deformation assemblies were well calibrated in a Walker-type large-volume press(LVP)by electrical resistance measurements combined with finite element simulations(FESs).Hard Al203 or diamond pistons in shear and uniaxial deformation assemblies significantly increase the efficiency of pressure generation compared with the conventional quasi-hydrostatic assembly.The uniaxial deformation assembly using flat diamond pistons possesses the highest efficiency in these deformation assemblies.This finding is further confirmed by stress distribution analysis based on FESs.With this deformation assembly,we found shear can effectively promote the transformation of C60 into diamond under high pressure and realized the synthesis of phase-pure diamond at relatively moderate pressure and temperature conditions.The present developed techniques will help improve pressure efficiencies in LVP and explore the new physical and chemical properties of materials under deformation in both science and technology.

shear/uniaxial deformationpressure calibrationfinite element simulationslarge-volume presshigh pressure

王赛赛、赵鑫宇、胡阔、丰丙涛、侯旭远、张羿鸣、刘书成、尚宇琛、刘兆东、姚明光、刘冰冰

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State Key Laboratory of Superhard Materials,Synergetic Extreme Condition User Facility,College of Physics,Jilin University,Changchun 130012,China

College of Earth Sciences,Jilin University,Changchun 130012,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Major Science Facility Synergetic Extreme Condition User Facility Achievement Transformation Platform ConstructionChina Postdoctoral Science FoundationChina Postdoctoral Science FoundationNational Key Research and Development Program of ChinaJilin University Highlevel Innovation Team Foundation,China

4227204141902034523020431230401552302043120115300632021FGWCXNLJSKJ012022M7200542023T1602572022YFB37066022021TD-05

2024

10.1088/1674-1056/ad58c6

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(9)