The electrical conductivity of H2O at 0.21– 4.18 GPa and 20–350°C |
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Authors: | Haifei Zheng Hongsen Xie Yousheng Xu Maoshuang Song Jie Guo Yueming Zhang |
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Institution: | (1) Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(2) Present address: Department of Geology, Peking University, 100871 Beijing, China |
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Abstract: | The electrical conductivity of H2O in solid and liquid phases has been measured at 0.21–4.18 GPa and 20–350°C. The results indicate: (I) different phases of
H2O in solid have different relations between electrical conductivity and temperature and pressure. The conductivity changes
continuously with temperature, but discontinuously with the pressure between 2.11 and 2.58 GPa, which corresponds to the transforming
pressure between ice (VI) and ice (VII);(II) the amductivity of H2O in liquid all increases with temperature and pressure, but there are discontinuities at pressures between 0.57 and 0.9 GPa,
and between 2.11 and 2.58 GPa, which are also consistent with the polyrnorph of ice (ice (V), ice (VI) and ice (VII)). This
reflects that H2O in liquid at different pressures has quite different properties of electron chemistry. It is probably the important reason
that causes the layers with high electrical conductivity and low velocity in the earth’s ceust and upper mantle. |
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Keywords: | high temperature and high pressure ice water electrical conductivity |
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