FIELD: chemistry.
SUBSTANCE: invention can be used in synthesis of superconducting materials. Heteropolynuclear complexes of nitrates of rare-earth elements, copper (II), barium and pyridine of the composition Ln(NO3)3·2Ba(NO3)2·3Cu(NO3)2·9(C5H5N·HNO3)·nH2O, where the lanthanides used are Tb, Dy, Ho, Er, Sm, Eu, Gd, are burnt at 250-300°C, crushed and annealed 900-930°C for such rare-earth elements such as terbium, dysprosium, holmium, erbium, or at 850-880°C for samarium, europium and gadolinium.
EFFECT: invention enables to obtain a superconducting orthorhombic phase of cuprates of rare-earth elements in form of fine-dispersed powder without additional saturation with oxygen.
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