滑块式六含八超高压实验装置及其压力温度标定  

A slide-type multianvil ultrahigh pressure apparatus and calibrations of its pressure and temperature

作　　者：吕世杰[1] 罗建太[1] 苏磊[1] 胡云[1] 袁朝圣[1] 洪时明[1] 

机构地区：[1]西南交通大学高温高压物理研究所,成都610031

出　　处：《物理学报》2009年第10期6852-6857,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10774123);高等学校博士学科点专项科研基金(批准号:20040613019)资助的课题~~

摘　　要：报道了一种新型六含八超高压实验装置.三柱式的机体框架与滑块式上三下三模具同为三次对称结构,在力学上较为合理.该装置加压时具有自动校准位置能力,同步性和重复性好.模具推动八块硬质合金压砧在叶腊石八面体中产生高压.分别采用Bi丝和ZnTe晶体的压致相变点2.55,7.7,9.6,12GPa,对截角边长8mm压砧和12.5mm边长叶腊石块组合的实验体系进行了室温下的压力标定,结果表明压力可达12GPa以上.在10GPa压力下,用WRe3-WRe25热电偶将温度标定到1560℃,并结合铁碳二元相图和钢堵头处石墨转变为金刚石的温度点,验证并延伸了标定结果,同时给出样品腔内的轴向温度梯度约为21℃/mm.A slide-type ultrahigh pressure apparatus with 6/8 anvils is described.The three-supporting pillars of the main framework and the slide-type multi-anvils have conformable mechanical symmetry.Under the loading uniaxial pressure,the first-stage anvils can be self-corrected and run with excellent synchronicity and reproducibility.In the present experiments,the edge length of pyrophyllite octahedron is 12.5 mm and the truncation edge length of tungsten carbide anvil is 8 mm.The cell pressure was calibrated at room temperature by means of the known pressure-induced phase transitions of Bi and ZnTe at 2.55, 7.7, 9.6 and 12.0 GPa. The cell temperature under 10 GPa was measured up to 1560℃ by WRe3-WRe25 thermocouple. The temperature calibration was reconfirmed and extended to the higher range by observation of diamond formation on the interface between graphite heater and steel plug, and by comparison of the variational details of recorded data and the Fe--C phase diagram, and then the axial temperature gradient was estimated to be about 21℃/mm.

关 键 词：压力标定 温度标定 六含八多压砧模具 高压装置 

分 类 号：O521.3[理学—高压高温物理] TQ05[理学—物理]