The effect of humid atmosphere (59 and 86~o) on phase composition and properties of YBa2Cu307 _ ~ powder and ceramics prepared by hot pressing has been studied. It has been found that with increase of water content in the powder to 1-6 mass.~o the superconducting properties of the corresponding ceramics gradually improve; on further increase of the water content the ceramics degrade resulting in a complete loss of superconductivity. The observed phenomenon can be explained by a plastifying effect of water on the powder by hot pressing on the one hand and by a solid-phase reaction of the products of decomposition (1-2-3) at a high temperature annealing, on the other.
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