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Citation: Zhao Liang-Zhong, Xie Min, Liu Shi-Hong, Chen Ben-Ming. Investigation of the Anodic Electrocrystallization of Superconductor Ba-K-Bi-O from Molten Salts[J]. Acta Physico-Chimica Sinica, ;1996, 12(12): 1094-1097. doi: 10.3866/PKU.WHXB19961209 shu

Investigation of the Anodic Electrocrystallization of Superconductor Ba-K-Bi-O from Molten Salts

1.
Institute of Chemistry,Academia Sinica,Beijing 100080

Received Date: 12 July 1996
Available Online: 15 December 1996

The deposits on anode and cathode in electrocrystallization of Ba-K-Bi-O superconductor from molten salts were characterized by using XPS and XRD. The morphology of resulting Ba-K-Bi-O crystals was analyzed by using SEM. The results show that the deposit on anode is superconducting Ba-K-Bi-O single crystals which grow as steps on the crystal faces. The deposit on cathode is controlled by the melt composition: the deposit is metallic Bi when the water content of KOH is relatively high; the deposit is Bi2O3 when the water content is relatively low and the melt contains NO3-; the deposit is metallic Zn when ZnO is added into the melt. The mechanism of electrocrystallization of Ba-K-Bi-O superconductor is discussed. We suggest that Bi ions in the melt may form complex ions with OH- ions, the latter migrate to the anode due to the action of convection, diffusion and electric migration. The formation of Ba-K-Bi-O and incorporation of Ba into the crystals may be related to highly oxidized species (e.g. O1-type oxygen)formed at the anode in the strong alkali melt.
- Ba-K-Bi-O superconductor,
- Electrocrystallization,
- Molten salts
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