METHOD OF PRODUCTION OF MAGNESIUM DIBORIDE Russian patent published in 2003 - IPC

FIELD: chemical industry; manufacture of laminated high-temperature superconductors and abrasive materials. SUBSTANCE: proposed method includes mixing amorphous boron powder in the amount of 0.3722 g and metallic magnesium chips in the amount of 0.6278 g. Mixture thus obtained is molded to form tablets. Annealing is performed in atmosphere of helium or argon cleaned above titanium sponge heated to temperature of 1000-1050 C. At first stage, annealing is performed at 800-810 C for 1-1.5 hours and at second stage, annealing is performed at 875-885 C for 1/1.5 hours. Superconductor thus obtained is composition MgB₂. Transient temperature to superconducting state is T_c = 39.5 K width of transition is ΔT_c = 2.5 K. Yield of product is 90%. EFFECT: enhanced efficiency. 2 cl, 2 ex