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．
The deposits on anode and cathode in electrocrystallization of Ba-K-Bi-Osuperconductor 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 showthat the deposit on anode is superconducting Ba-K-Bi-O single crystals which grow assteps 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 depositis Bi2O3 when the water content is relatively low and the melt contains NO3-; the depositis metallic Zn when ZnO is added into the melt. The mechanism of electrocrystallizationof Ba-K-Bi-O superconductor is discussed. We suggest that Bi ions in the melt, may formcomplex 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 incorporationof 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.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1996年第12期1094-1097,共4页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
国家超导实验室资助
关键词
钡钾铋氧化物
超导体
电结晶
熔盐
阳极
Ba-K-Bi-O superconductor, Electrocrystallization, Molten salts
