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金刚石对顶砧原位电导率测量系统

DOI: 10.11858/gywlxb.2012.01.004, PP. 27-32

Keywords: 金刚石对顶砧,高温高压,电导率,激活能

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Abstract:

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(Mg0.875,Fe0.125)2SiO4在高温高压环境下(31~35GPa,1500~3400K)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15GPa,低于1200K)条件相比,其激活体积和激活能都明显减小。

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