物理化学学报 >> 1996, Vol. 12 >> Issue (12): 1094-1097.doi: 10.3866/PKU.WHXB19961209

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Ba-K-Bi-O超导体熔盐阳极电结晶研究

赵良仲,谢民,刘世宏,陈本明   

  1. 中国科学院化学研究所，北京 100080
  • 收稿日期:1996-07-12 修回日期:1996-09-16 发布日期:1996-12-15
  • 通讯作者: 赵良仲

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

Zhao Liang-Zhong,Xie Min,Liu Shi-Hong,Chen Ben-Ming   

  1. Institute of Chemistry,Academia Sinica,Beijing 100080
  • Received:1996-07-12 Revised:1996-09-16 Published:1996-12-15
  • Contact: Zhao Liang-Zhong

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摘要：

用XPS和XRD表征了Ba-K-Bi-O超导体熔盐电结晶的阳极和阴极产物，用SEM分析了Ba－K－Bi－O单晶生长形态．结果表明，阳极产物是Ba-K－Bi－O超导体单晶，以台阶式方式生长.阴极产物则与熔盐成分有关：当KOH含水量相对较高时阴极上析出金属铋；KOH含水量较低和熔盐中含NO3-时阴极产物是Bi2O3;熔盐中加入ZnO时阴极上析出金属锌.还讨论了Ba－K-Bi－O超导体的阳极电结晶机理，认为铋离子在熔盐中可能形成络离子，后者在对流、扩散和电迁移的作用下到达阳极并在阳极上放电．Ba-K－Bi－O的生成和Ba进入晶格可能与强碱性环境中阳极上生成O1-种类氧有关

关键词: 钡钾铋氧化物超导体, 电结晶, 熔盐

Abstract:

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.

Key words: Ba-K-Bi-O superconductor, Electrocrystallization, Molten salts