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Oxygen Nonstoichiometry and Permeability of Co-substituted YBa2Cu3O6+δ
Zheng Cuihong, Yang Pinghua, Liu Wei, Chen Chusheng
Department ofMaterials Science and Engineering, University ofScience andTechnology ofChina, Hefei 230026
Abstract:
The effects of substitution of Cu by Co in YBa2Cu3O6+δ on the oxygen nonstoichiometry and permeability were investigated. The oxygen nonstochiometry δ increased as a result of Co substitution, and its values did not change very much with the changing temperature and oxygen partial pressure. An oxygen permeation flux of 57 μmol/cm2s was observed at 850℃ from YBa2Cu2CoO6+δ disk-shaped dense sample of thickness 1.2 mm with one side exposed to air (PO2=21.2 kPa) and the other side to flowing helium (PO2=101 Pa), but only 31 μmol/cm2s was measured for YBa2Cu3O6+δ. The improved oxygen permeabilty in YBa2Cu2CoO6+δ was attributed to the even distribution of oxygen ions and oxygen vacancacies in the basal plane.
Key words:  YBa2Cu3O6+δ, Oxygen nonstoichiometry, Oxygen permeability, Diffusion
FundProject:
Co掺杂的YBa2Cu2O6+δ的氧非计量和氧渗透性能研究
郑翠红, 杨萍华*, 刘卫, 陈初升
中国科学技术大学材料科学与工程系,合肥,230026
摘要:
研究钴离子部分取代铜离子对YBa2Cu3O6+δ的氧非计量值δ和氧渗透率的影响.对于钴替代的样品,氧非计量的绝对值变大,且其数值不再随温度和氧分压的变化发生显著变化.YBa2Cu2CoO6+δ样品在中、高温具有可观的氧渗透率.对于厚度为1.2 mm的致密YBa2Cu2CoO6+δ样品,在850℃时,只要在样品两端施加较小的氧分压差(PO2=21.2 kPa、 PO2=101 Pa),其氧渗透率即可达57 μmol/cm2 s, 明显高于YBa2Cu3O6+δ的氧渗透率(31 μmol/cm2 s).YBa2Cu2CoO6+δ的高氧渗透率在结构上可被归结为位于晶胞基面上的氧离子和氧空位的均匀分布.
关键词:  YBa2Cu2CoO6+δ  氧非计量  氧渗透  扩散
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