| http://www.w3.org/ns/prov#value | - The preparation and processing of the powder must take place in an inert atmosphere, in particular with the exclusion of water and CO2, since YBa2 Cu3 O7-??, Y2 Cu2 O5, Y2 BaCuO5 and BaCuO2 react rapidly with these materials and are decomposed, with the formation of BaCO3 or Ba(OH)2.
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