Abstract
During the synthesis by electrodeposition of Ba 1− x K x BiO 3 superconducting crystals, black crystals of a new phase were grown at the anode. Chemical analysis (WDS) revealed the presence of sodium in these crystals. The chemical formula, Ba 3.12K 0.66Bi 3.37Na 0.63O 12, and the structure have been determined from single crystal X-ray diffraction. The structure is perovskite-like with a = 8.54Å=2 a p, a p being the lattice parameter of the perovskite cell. The doubling is due to a 1( B′):3( B) ordering on the octahedral sites. The B sites are occupied by Bi 5+ cations whereas the B′ sites are occupied by a mixture of Na and Bi cations. The latter should be disproportionated into Bi 3+ and Bi 5+. No sign of diamagnetism has been detected in these crystals at low temperature.
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