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We have presented Arrhenius plots of the total conductivity of Nd6MoO12 and Nd10Mo2O21 in dry and wet atmospheres (air). A systematic increase of bulk conductivity in wet air/Ar as compared to the conductivity in dry atmospheres is indicative of hydration of the samples resulting in proton conductivity. It was observed a significant increase of conductivity for reduction conditions, typical of n-type conductors, which can be attributed to the partial reduction of Mo6+. We have studied the dehydration of the newly sinthesized and hydrated Nd6MoO12, Nd10Mo2O21 samples in the range of 25–1000°C.