金刚石对顶砧中四点探针法精确测量样品电阻率的电极因素  

The Electrodes Factor of Accurate Resistivity Measurement with Four-Point Probe Method in a Diamond Anvil Cell

作　　者：吴宝嘉[1,2] 韩永昊[1] 崔晓岩[1] 刘才龙[1] 王月[1] 彭刚[1] 高春晓[1] 

机构地区：[1]吉林大学超硬材料国家重点实验室,吉林长春130012 [2]延边大学理学院物理系,吉林延吉133002

出　　处：《高压物理学报》2008年第3期232-236,共5页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(10574055);973计划资助课题(2005CB724404)

摘　　要：为了解金刚石对顶砧上电阻率高压原位测量中的电极效应,使用有限元分析方法,对样品中的稳恒电流场进行了模拟计算,发现电极的几何尺寸以及电极与样品电阻率的差别都会对测量误差产生影响。结果发现:电极的尺寸越大,误差越大;电极与样品电阻率数值差越大,误差越大。由此给出了减小电极效应以及减小测量误差的方法。To figure out the effect of electrode resistivity on the insitu resistivity measurement with four-point probe method in a diamond anvil celt（DAC）,the authors simulated the distribution of the steady electric field in the sample with finite element analysis（FEA）. It reveals that the electrode resistivity smaller than the sample resistivity too much would result in a large measurement error, and therefore indicates that reducing the resistivity difference between the electrode and sample can im- prove the measurement accuracy.

关 键 词：高压 四点探针法 电阻率 电极效应 

分 类 号：O521.2[理学—高压高温物理]