Abstract
We study the influence of a close-lying non-magnetic and non-charged metal disk on the hydration reaction of YBa2Cu3O6+δ (YBCO). It has been established that at a distance in the range of 6–7 mm from the disk surface, the rate of the hydration is significantly reduced relative to distances out of this interval. The effect obtained is very puzzling. It allows assuming an interaction of unknown nature to exist between YBCO and the disk. Further direct measurements of the force acting between these bodies have been performed. A recorded repulsive interaction with a magnitude of 6.5·10−6 N, which is 0.04% of the sample weight, has confirmed our assumption.
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