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在0.21～4.18GPa和20～350℃下测量了固相和液相H_2O的电导率.结果表明:(1)不同的团相H_2O具有不同的电导率与温度压力关系.电导率与温度的关系是连续的,但是在2.11GPa与2.58GPa压力之间存在着不连续现象,这与相应压力下的冰_Ⅵ和冰_Ⅶ是对应的;(2)液态H_2O的电导率均随温度和压力的增高而增大,但随压力的不同分别在0.57GPa与0.9GPa和2.11GPa与2.58GPa压力之间存在着突变(不连续),其不连续的压力值与固态H_2O的同质多型(冰_Ⅴ、冰_Ⅵ和冰_Ⅶ)转变压力一致,这反映不同压力条件下液态H_2O具有非常不同的电化学性质.水的这种电导率性质可能是造成下地壳存在高导层和上地幔存在地震波低速层的重要原因.
The conductivity of H_2O solid phase and liquid phase was measured at 0.21 ~ 4.18GPa and 20 ~ 350 ℃ .The results showed that: (1) The different phase H_2O had different conductivity and temperature-pressure relationship.The relationship between conductivity and temperature Is continuous, but there is a discontinuity between the pressures of 2.11 GPa and 2.58 GPa, corresponding to the ice_VI and ice_II under the corresponding pressure. (2) The conductivity of the liquid H_2O increases with temperature and pressure But with the different pressures, there is a sudden change (discontinuity) between 0.57GPa and 0.9GPa and the pressure between 2.11GPa and 2.58GPa. The discontinuous pressure value is different from that of solid H_2O Ice_V, ice_VI and ice_VII) consistent with the transformation pressure, which reflects the liquid H_2O with very different electrochemical properties under different pressure conditions.The nature of water conductivity may be caused by the existence of the high crust in the lower crust and the upper The Mantle has an important reason for the low velocity layer of seismic waves.