欢迎登录材料期刊网

材料期刊网

高级检索

电导率测量的过程历经了从直流一交流一阻抗谱的过程,已经为地球物理学家借助于高温高压手段研究固体深部物质电学性质所广泛认同的.本文首先介绍了阻抗谱法测定水晶电导率的实验原理,进而采用该方法在10-1~106Hz的频率范围以及1.0~4.0GPa和823~1073K条件下,借助于YJ-3000t紧装式六面顶高压设备对沿Z轴方向生长的水晶进行了的电导率实验就位测量.实验结果表明:在选择的频率范围,样品的复阻抗的模和相角都对频率具有很强的依赖性;随着温度的升高,电阻迅速降低,电阻率降低,电导率增大;在压力1.0~4.0GPa,其活化焓分别为:0.8548eV、0.8320eV、0.8172eV、0.7834eV,独立于温度的指前因子分别为:1.003S/m、1.778S/m、3.082S/m、6.987S/m,活化焓随着压力的升高而降低,指前因子随着压力的升高而增大.

参考文献

[1] 潘兆橹.结晶学及矿物学[M].武汉:中国地质大学出版社,1993:67-76.
[2] CARPENTER M A;Salje E K H;Graeme Barker A .Calibration of Excess Thermodynamic Properties and Elastic Constant Variations Associated with the α-β Phase Transition in Quartz[J].American Mineralogist,1998,83:2-22.
[3] 周文戈,谢鸿森,赵志丹,周辉,郭捷.α-β石英相变的应变参数计算及其地质意义[J].高压物理学报,2002(04):241-248.
[4] Xu Y S;Poe B T;Shankland T J .Electrical Conductivity of Minerals ofthe Mantle Transition Zone[J].,1998,280:1415-1418.
[5] 谢鸿森,周文戈,刘永刚,郭捷,侯渭.地球深部物质的某些物性测量方法研究[J].地学前缘,2003(02):357-365.
[6] Cemic L .Impedance Spectroscopy and Defect Chemistry of Fayalite[J].Physics and Chemistry of Minerals,1996,23:186-192.
[7] Roberts J J;Tyburczy J A .Impedance Spectroscopy of Single and Polycrystalline Olivine: Evidence for Grain Boundary Transport[J].Physics and Chemistry of Minerals,1993,20:19-26.
[8] Xu Jian;Zhang Yueming;Hou Wei.Measurements of Ultrasonic Wave Velocities at High Temperature and High Pressure for Window Glass,Pyrophylite and Kimberlite up to 1400℃ and 5.5GPa[M].High Temperature and High Pressure,1994:375-384.
[9] Yousheng Xu;Brent T. Poe;Thomas J. Shankland .Electrical Conductivity of Olivine, Wadsleyite, and Ringwoodite Under Upper-Mantle Conditions[J].Science,1998(5368):1415-1418.
[10] Yousheng Xu;T. J. Shankland;A. G. Duba .Pressure effect on electrical conductivity of mantle olivine[J].Physics of the Earth and Planetary Interiors,2000(1/2):149-161.
[11] Omura K;Kurita K;Kumazawa M .Experimental Study of Pressure Dependence of Electrical Conductivity of Olivine at High Temperatures[J].Physics of the Earth and Planetary Interiors,1993,57:291-303.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%