金刚石对顶砧原位电导率测量系统  

An in Situ Electrical Conductivity Measurement System in Diamond Anvil Cell

作　　者：李明[1,2] 杨洁[3] 杨伍明[1] 王会新[1] 李立新[1] 高春晓[2] 

机构地区：[1]河南理工大学物理化学学院,河南焦作454000 [2]吉林大学超硬材料国家重点实验室,吉林长春130012 [3]空军航空大学基础部,吉林长春130012

出　　处：《高压物理学报》2012年第1期27-32,共6页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(10874053;10574055;50802033;50532020);河南省科技攻关重点项目(092102210242);河南理工大学博士基金(648229);燕山大学亚稳材料制备技术与科学国家重点实验室开放课题(201109)

摘　　要：在金刚石对顶砧中进行原位高温高压电阻测量时,由于受到绝热层的限制,从而达不到理想的温度条件。采用普通的粉末绝热材料,会给电极的引入造成很大困难,而且不规则的电阻丝使电阻测量很难精确量化。利用溅射镀膜方法,在对顶砧的砧面上镀氧化铝膜作绝热层,溅射的金属钼膜作电极材料,成功地完成了高温高压条件下原位电阻的测量。利用此装置,测量了铁镁硅酸盐(Mg0.875,Fe0.125)2SiO4在高温高压环境下(31～35GPa,1 500～3 400K)的电导率,得到了样品的导电粒子激活能,发现其激活能随着压强的升高而增大,与低压低温(小于15GPa,低于1 200K)条件相比,其激活体积和激活能都明显减小。In situ resistance measurement in a diamond anvil cell under high pressure and high temperature will be restricted by the thermal insulation. If the ordinary powder heat insulating material is used,it is difficult to introduce the electrode and measure resistance accurately. Here the in situ resistance measurement under high pressure and high temperature is performed successfully using a sputtered alumina film coated onto the surface of the top anvil plate as an insulation layer and a sputtered molybdenum film used as an electrode. With this device,the electrical conductivity o~ iron magnesium silicate [（Mg0.875 ,Fe0.125）23iO4] under 31-35 GPa and 1 500-3 400 K is obtained. It is found that the activation energy increases with pressure, and the activation volume and activation energy are significantly reduced compared to that under the pressure and temperature lower than 15 GPa and 1 200 K.

关 键 词：金刚石对顶砧 高温高压 电导率 激活能 

分 类 号：O521.3[理学—高压高温物理]