冲击压缩下金属的电导率测量  

Electrical Conductivity Measurements for Metals under Shock Compression

作　　者：毕延[1] 谭华[1] 经福谦[1] 赵敏光[2] 

机构地区：[1]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,四川绵阳621900 [2]四川师范大学固体物理研究所,四川成都610068

出　　处：《高压物理学报》2003年第1期1-7,共7页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金重点项目 ( 10 0 32 0 40 );中国工程物理研究院科学技术基金 ( 970 10 5 );中国工程物理研究院院外基金 ( 990 10 10 3)

摘　　要：探索了一种在兆巴压力冲击压缩下测量金属电导率的新方法———四电极垂向引线法 ,并用刻槽单晶蓝宝石作绝缘腔体 ,以消除分流效应对测量结果的影响。用二级轻气炮作为加载手段 ,测量了铁在终态平衡压力为 1 0 1～ 2 0 8GPa压力区间内的电导率 (电导率从 1 .45×1 0 6S/m变化到 7.65× 1 0 5S/m)。将测量铁电导率的压力范围扩展到了 2 0 0GPa以上。实验结果表明 ,关于金属电导率的Bloch Gr櫣ｎｅｉｓｅｎ公式在高达 2 0 0GPa冲击压力下仍然有效 (对于ε 铁 )。A novel method using four electrodes perpendicular to shock front was proposed to measure the electrical conductivity of metals under shock compression up to megabar pressures. Using the drilled sapphire disk as insulator can eliminate the shunting effect, which will result in a higher conductivity data. The electrical conductivities of iron under shock compression in the final equilibrium pressures ranging from 101 to 208 GPa were obtained by using the two-stage light gas gun techniques. The measured conductivity of iron varies from 1.45×106 S/m at 101 GPa and 2010 K, to 7.65×105 S/m at 208 GPa and 5220 K, which first extend the electrical conductivity measurements of iron to pressures beyond 200 GPa. The experimental results indicate that the Bloch-Gruneisen equation describing the high-pressure electrical conductivity of metals still holds true up to 200 GPa for Ε-Fe (hcp structure).

关 键 词：测量 冲击压缩 Bloch-Grueneisen公式 金属电导率 高压物性 相变 

分 类 号：TG115.26[金属学及工艺—物理冶金] O521.21[金属学及工艺—金属学]