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The properties of Nb-doped YBa,Cu,O, ceramics obtained by thermolysis of the oxide or nitrate (Y, Ba, Cu) solution in ammonium nitrate melt were studied. For t h e composition YBa,Cu,~,Nb,,,,O,., , T, = 92 K and the transport critical current J , = 100&4000 A cm? were obtained. The magnetic flux profile was studied by a magneto-optic method at B = 290 G. Domains of size 200400 fin-were found with magnetic critical current J," = 2 x lo4 A cm-2 at 77 K and IO5 A cm-2 at 11 K.

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