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摘要: 利用阻抗谱在1.0~2.0 GPa、温度450~792 K条件下、105~12 Hz的频率范围内,对辉石岩的电导率进行了研究,并且分析了测试频率对电导的影响,结果表明,电导率对频率具有一定的依赖性;在复平面上出现了代表颗粒内部的阻抗弧。辉石岩的激化焓为0.661~0.673 eV,样品中较高的铁含量可能是造成本实验电导率较高的主要原因。Abstract: The electric conductivity of pyroxenite has been measured at pressure of 1.0~2.0 GPa, temperature of 320~700 ℃, and frequency of 105 Hz to 12 Hz, and the conduction mechanism has been analyzed in terms of the impedance spectra. Experimental results indicated that the electric conductivity of pyroxenite depended on the frequency of alternative current. Impedance arcs representing the conduction mechanism of grain interiors are displayed in the complex impedance plane, and this mechanism is dominated at high pressure. The activation enthalpies for pyroxenite are 0.661~0.673 eV. Higher iron content may lead to the higher values of the electrical conductivity in the experiments.
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Key words:
- high temperature and pressure /
- impedance spectra /
- pyroxenite /
- conduction mechanism
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Walsh J M, Shreffler R G, Willig F J. Limiting Conditions for Jet Formation in High Velocity Collisions [J]. J Appl Phys, 1953, 24: 349. Asay J R. Material Ejection from Shock-Loaded Free Surface of Aluminum and Lead [R]. SAND76-0542, 1976. Asay J R. A Model for Estimating the Effects of Surface Roughness on Mass Ejection from Shocked Materials [R]. SAND78-1256, 1978. Zeng J R, Zhuang Y H. Mass Ejection from Free Surface of Shock-Loaded Metallic Plates [J]. Chinese Journal of High Pressure Physics, 1987, 1(1): 88-92. (in Chinese) 曾鉴荣, 庄以河. 动载荷下金属板表面的微物质喷射 [J]. 高压物理学报, 1987, 1(1): 88-92. Han C S. A Semi-Empirical Equation for Estimating the Micro-Jet Ejection from Shocked Free-Surface [J]. Chinese Journal of High Pressure Physics, 1989, 3(3): 234-240. (in Chinese) 韩长生. 估算冲击加载下材料自由面微射喷射量的一个半经验解析公式 [J]. 高压物理学报, 1989, 3(3): 234-240. Chen J, Jing F Q, Zhang J L, et al. Molecular Dynamics Simulation of Micro Particle Ejection from a Shock-Impacted Metal Surface [J]. Acta Physica Sinica, 2002, 51(10): 2386-2391. (in Chinese) 陈军, 经福谦, 张景琳, 等. 冲击作用下金属表面微喷射的分子动力学模拟 [J]. 物理学报, 2002, 51(10): 2386-2391. Lucy L B. A Numerical Approach to the Testing of the Fission Hypothesis [J]. Astron J, 1977, 82: 1013-1020. Monaghan J J. Why Particle Methods Work [J]. SIAM Journal of Scientific and Statistical Computing, 1982, 3(4): 422-433. Monaghan J J, Gingold R A. Shock Simulation by the Particle Method SPH [J]. J Comput Phys, 1983, 52: 374-389. Libersky L D, Petschek A G. Smoothed Particle Hydrodynamics with Strength of Materials [J]. Advances in the Free Lagrange Method, Lecture Notes in Physics, 1990, 395: 248-257. Hu X M. Research on Constitutive Model and Spallation of Material under Shock Load [R]. GF-A, ZW-J-2002004, 2002. (in Chinese) 胡晓棉. 冲击加载下材料本构及断裂研究 [R]. GF-A, ZW-J-2002004, 2002. Libersky L D, Randles P W, Carney T C. Recent Improvements in SPH Modeling of Hypervelocity Impact [J]. Int J Impact Engg, 1997, 20: 525-532. Benz W, Asphaug E. Simulation of Brittle Solids Using Smooth Particle Hydrodynamics [J]. Computer Physics Communications, 1995, 87: 253-265.
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