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VOLUME 48 (1988) | ISSUE 4 | PAGE 193
Structural transition of YBa2Cu3O6.9 due to a shock compression up to 270 kbar
Subjecting the ceramic Y-Ba-Cu-O of the 1-2-3 composition to shock compression (p — 270 kbar) produces a ceramic of the same composition which under normal conditions (ρ = 0, Τ = 300 К) has a tetragonal structure with a о lattice constant с = 11.710 A and which undergoes a transition to the superconducting state at a temperature 93 K.