Add time:08/15/2019         Source:sciencedirect.com

Electrical conductivity measurements of synthetic anorthite were carried out as a function of pressure and temperature by a Solartron-1260 Impedance/Gain phase analyzer in a multi-anvil apparatus. The impedance spectroscopy was performed in a frequency range from 10–1 Hz to 106 Hz. The sample was synthesized at 1673 K in a high temperature furnace. Our experimental results show that (1) a dramatic increase in electrical conductivity with increasing temperature and a slightly decrease in conductivity with increasing pressure at constant temperature, however, the effect of pressure on the conductivity is less pronounced than that of temperature; (2) the activation enthalpy linearly increases with increasing pressure (1.86–1.91 eV) reflecting the mobility of Ca2+ decreases as the anorthite framework becomes more compressed; (3) the activation energy at atmospheric pressure and activation volume are 1.83 eV and 2.39 cm3/mol, respectively; (4) According to these Arrhenius parameters, it is proposed that the possible dominant mechanism of the charge transport in anorthite under experimental conditions is the hopping of Ca2+ from one near aluminum oxygen site to another; (4) the diffusion coefficient of calcium was calculated from the present conductivity data using Nernst–Einstein equation, and compared with previous experimental results.

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