Equation of State, Electrical Properties and Phase Transition in CuO at High Pressure
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摘要: 在活塞-圆筒式高压装置上研究了CuO在4.5 GPa内的p-V关系,给出了它的状态方程、格临爱森参数0、体积模量B0以及B0的压力导数B0'。在金刚石压砧装置上,采用我们建立的电阻、电容测量方法研究了CuO在22 GPa内电阻、电容与压力的关系。实验结果表明,CuO的电阻和电容在一些压力下都发生了突然的变化。这些变化可能与CuO内部的电子结构和晶界处的结构状态变化有关。Abstract: The p-V relationship for CuO at room temperature and up to 4.5 GPa has been studied using the piston-cylinder type measurement device, and its equation of state, Grneisen parameter 0, bulk modulus B0 and the first order pressure derivative B0' have been given. And the resistance-pressure and capacitance-pressure relationships at room temperature and the pressures up to 22 GPa have been studied in a diamond anvil cell using resistance and capacitance measurements. Experimental results show that several anomalous changes in resistance and capacitance occur. We conjecture that the change at about 5 GPa may be caused by the change of the interior electronic structure (electronic structure transition), and the changes at other pressures may be related to the changes of structures of states in the crystal boundary. These results are valuable to understand the mechanism of superconductivity for the copper-bearing oxide superconductors.
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Key words:
- high pressure /
- equation of state /
- electrical property /
- electronic structure transition
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鲍忠兴, 张芝婷. 高压物理学报, 1990, 4(2): 157. 鲍忠兴, 张芝婷, 俞汀南. 科学通报, 1984, 29(14): 846. Bap Z X, Sehmidt V H, Howell F L. J Appl Phys, 1991, 70(11): 6804. 程开甲, 程漱玉. 力学进展, 1991, 21(1): 23. 蔡宗义. 实现CuO髙压电子相变条件的理论设计方法. 西安: 西北核技术研究所, 1997.
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