An in situ electrical conductivity measurement system in diamond anvil cell

作者：Li Ming^*; Yang Jie; Yang Wu Ming; Wang Hui Xin; Li Li Xin; Gao Chun Xiao

来源：Chinese Journal of High Pressure Physics, 2012, 26(1): 27-32.

• Activation volume
• Alumina films
• Diamond anvil cell
• Electrical conductivity
• Electrical conductivity measurements
• High pressure and high temperature
• High temperature and high pressure
• In-situ
• Insulation layers
• Magnesium silicates
• Molybdenum films
• Pressure and temperature

In situ resistance measurement in a diamond anvil cell under high pressure and high temperature will be restricted by the thermal insulation. If the ordinary powder heat insulating material is used, it is difficult to introduce the electrode and measure resistance accurately. Here the in situ resistance measurement under high pressure and high temperature is performed successfully using a sputtered alumina film coated onto the surface of the top anvil plate as an insulation layer and a sputtered molybdenum film used as an electrode. With this device, the electrical conductivity of iron magnesium silicate [(Mg0.875, Fe0.125)2SiO4] under 31-35 GPa and 1500-3400 K is obtained. It is found that the activation energy increases with pressure, and the activation volume and activation energy are significantly reduced compared to that under the pressure and temperature lower than 15 GPa and 1200 K.

• 出版日期2012
• 单位Polytechnic university