金刚石对顶砧原位电导率测量系统

 在金刚石对顶砧中进行原位高温高压电阻测量时，由于受到绝热层的限制，从而达不到理想的温度条件。采用普通的粉末绝热材料，会给电极的引入造成很大困难，而且不规则的电阻丝使电阻测量很难精确量化。利用溅射镀膜方法，在对顶砧的砧面上镀氧化铝膜作绝热层，溅射的金属钼膜作电极材料，成功地完成了高温高压条件下原位电阻的测量。利用此装置，测量了铁镁硅酸盐(Mg_0.875,Fe_0.125)₂SiO₄在高温高压环境下（31~35 GPa，1 500~3 400 K）的电导率，得到了样品的导电粒子激活能，发现其激活能随着压强的升高而增大，与低压低温（小于15 GPa，低于1 200 K）条件相比，其激活体积和激活能都明显减小。

An in Situ Electrical Conductivity Measurement System in Diamond Anvil Cell

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 1 500-3 400 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 1 200 K.