In-situ ultrasonic calibrations of pressure and temperature in a hinge-type double-stage cubic large volume press  

作　　者：Qingze Li Xiping Chen Lei Xie Tiexin Han Jiacheng Sun Leiming Fang 李青泽;陈喜平;谢雷;韩铁鑫;孙嘉程;房雷鸣(Key Laboratory for Neutron Physics,Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]Key Laboratory for Neutron Physics,Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China

出　　处：《Chinese Physics B》2022年第6期272-277,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12075215,11872198,and U2030110);the National Key Research and Development Program of China(Grant No.2016YFA0401503)。

摘　　要：Here,simultaneous in-situ calibration of pressures and temperatures was performed in a hinge-type second-stage cubic large volume press(LVP)up to 15 GPa and 1400 K by an acoustic travel-time approach.Based on the recently reported P-tSand P-T-tP-tSequations for Al2O3buffer rod,the cell pressures and temperatures in the chamber of LVP were insitu determined,in comparison with those by conventional off-line(or fixed-points)pressure calibration method and direct thermocouple measurement,respectively.It is found that the cell pressures of the LVP chamber are significantly reduced after annealing at simultaneous high pressures and high temperatures,owing to the stress relaxation as accumulate in the LVP chamber.This acoustic travel-time method is verified to be a good way for precise determination of thermal(cell)pressures at high temperature conditions,and is of great importance and necessity to conduct in-situ physical property measurements under extreme high P-T conditions,especially when the precious synchrotron x-ray/neutron diffraction beams are not available.

关 键 词：cubic press simultaneous in-situ calibration of pressures and temperatures acoustic travel-time high pressure and high temperature 

分 类 号：TH69[机械工程—机械制造及自动化]