高压物理学报2024，Vol.38Issue(3)：121-128,8.DOI:10.11858/gywlxb.20230807
大腔体压机腔体压强28 GPa的标定方法
Pressure Calibration Method of 28 GPa for Large-Volume Press
摘要
Abstract
In the large-volume press(LVP),the pressure calibration for the sample chamber is generally carried out by using phase transitions of specific materials with resistance changes.But there are no suitable materials for pressure calibration in the range of 22.5-34.5 GPa.As we know,the mineral 50 mol％MgSiO3-50 mol％Al2O3(En50Cor50)systems in deep earth undergo structural transition to perovskite phase under high pressure and high temperature(HPHT)conditions.Moreover,the content of Al2O3 dissolved in perovskite MgSiO3 increases gradually with raised pressure above 27 GPa.Therefore,En50Cor50 was selected as the pressure calibration material for further calibrating 28 GPa in the LVP in this study,and this is an indirect pressure calibration method.First,the low-pressure calibration curve(6.0-22.5 GPa)of system oil pressure versus chamber pressure was obtained by using the phase transitions of different pressure calibration materials.Then,based on the low-pressure calibration curve and previous research results En50Cor50,the estimated system oil pressure corresponding to the 28 GPa of chamber pressure is 65 MPa.At the estimated oil pressure,the En50Cor50 samples were heated to 2 000 K and maintained for 3-7 h.The results of X-ray diffraction,Raman,and electron probe measurements indicate that bridgmanite has been successfully synthesized,and the dissolved Al2O3 molar fraction is greater than 13.7％.According to the previous research results,the corresponding sample chamber pressure is about 29 GPa.This method successfully calibrated the sample chamber pressure around 28 GPa in the LVP,which fill in the blanks for calibrating this pressure range.关键词
大腔体压机/压力标定/28 GPa/高温高压Key words
large-volume press/pressure calibration/28 GPa/high pressure and high temperature分类
数理科学引用本文复制引用
葛雨非,刘兆东,周强,朱品文,由存,王星淋,连敏,赵鑫宇,丰丙涛,马孝慈,陶强,胡阔..大腔体压机腔体压强28 GPa的标定方法[J].高压物理学报,2024,38(3):121-128,8.基金项目
国家自然科学基金(11974131) （11974131）
国家重点研发计划项目(2018YFA0703400) （2018YFA0703400）
"综合极端条件实验装置"国家重大科技基础设施项目(发改投资[2017]1597号) （发改投资[2017]1597号）
