硫化铁的两个电导率相关的相变

Electrical Conductivity Evidence for Phase Transitions of FeS under High Temperature and High Pressure

由于X射线对高级相变和电子相变不够敏感，致使很多物质的相变和新的性质被忽略。对物质电阻的变化进行分析可以很好地弥补这一缺陷。通过金刚石对顶砧上原位电阻测量方法，在0～88．7GPa的压强范围内，在300～443K的温度条件下，基于范德堡法电阻测量原理，对硫化铁的电导率进行了测量。通过对电导率的分析发现，在零压、温度为408K的条件下，硫化铁转变成了NiAs结构相。在34．7GPa和61．3GPa压强处发现了两个新的突变点，为了印证这两处相交的可靠性，分别测量了在不同压强下样品电导率随温度的变化情况。

The electrical properties of stoichiometric iron sulfide（FeS） were investigated under high pressure with a designed diamond anvil cell（DAC）. The process of phase transition was reflected on the discontinuity of electrical conductivity changing with high pressure. The conductivity of FeS with NiAs structure was found to be much smaller than other phases. Two new phase transitions without structural change were observed at 34.7 GPa and 61.3 GPa.