A dielectric loss study of porous MgO indicates that H 2 O absorption on MgO probably leads to the formation of surface defects as well as hydroxide ions. The ac conductivity, σ ac followed the equation σ ac =σ 1 + KP H2O 0.27 from 550° to 800°C when the water partial pressure was varied between 7 × 10 −5 and 3 × 10 −2 atm.
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Johnson et al. (1966) studied this question.
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