Abstract
The electrical conductivity of hot-pressed magnesia (HPM) was investigated as a function of porosity in the temperature range 500–900 °C. The conductivity decreases with increasing porosity. The activation energy of the conductivity varies between 1.2 and 2.0 eV in the temperature range 650–900 °C. It is suggested that the electrical conductivity in HPM is controlled by enhanced oxygen diffusion along the grain boundaries.
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