The very fine and surface reactive powder mixture was prepared by high
ly intensive short time mill grinding of the components Y2O3, BaCO3 an
d CuO. Pure YBa2Cu3O7 created by reaction of the components of grindin
g mixture at temperature 900-950 degrees C. The temperature of the syn
thesis of YBa2Cu3O7 decreased owing to the grinding about 50 to 100 de
grees C. Lower temperature of the synthesis had a positive effect on t
he purity of the final product.