FIELD: non-ferrous metallurgy; production of superconducting materials. SUBSTANCE: material contains, at.%: lanthanum or yttrium, 7.7-8.0; barium, 15.4-16.0; silver, 23.1-24.0; selenium, 52.0-53.9. Its chemical structure is described by formula $$$ or $$$, where x varies from 0 to 0.5. Transition temperature to superconducting state is 373 K. EFFECT: higher operating characteristics. 1 dwg
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