YBCO超导层的a轴晶生长研究
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摘要
采用化学溶液沉积制备YBCO薄膜,研究了氧分压对YBCO超导层a轴晶生长的影响.研究发现氧分压是YBCO薄膜a轴晶形成的关键因素.当氧分压改变,YBCO生长模式由c轴生长转变为过渡到a(b)-c混合生长模式.低氧分压可以促进YBCO的c轴生长.高氧分压影响YBCO超导层的微观结构,促使YBCO的织构取向变差,最终导致YBCO超导层的性能降低.
YBCO superconducting layers were prepared by chemical solution deposition.The influence of oxygen partial pressure on the growth of a-axis grains was investigated.The result showed that the oxygen partial pressure was the key parameter for the formation of a-axis grain.The growth model was changed fromc-axis growth to the a(b)-c axis mixed growth with increasing the oxygen partial pressure.It was useful for c-axis grain growth in the case of low oxygen partial pressure.When the oxygen partial pressure was kept high level,YBCO layer had weak texture and poor microstructure.The a-axis and b-axis grains with the angle of 90°were formed on the surface.It would lead to the low performance of YBCO film.
YBCO superconducting layers were prepared by chemical solution deposition.The influence of oxygen partial pressure on the growth of a-axis grains was investigated.The result showed that the oxygen partial pressure was the key parameter for the formation of a-axis grain.The growth model was changed fromc-axis growth to the a(b)-c axis mixed growth with increasing the oxygen partial pressure.It was useful for c-axis grain growth in the case of low oxygen partial pressure.When the oxygen partial pressure was kept high level,YBCO layer had weak texture and poor microstructure.The a-axis and b-axis grains with the angle of 90°were formed on the surface.It would lead to the low performance of YBCO film.
引文
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[5]Wu L.Solovyov V.F.Wiesmann H.J.Zhu Y.Suenaga M.,Appl.Phys.Lett.,80(2002),419.
[6]Wong N.W.Levin I.Cook L.P.Feenstra R.,Appl.Phys.Lett.,88(2006),102507.
[7]Solovyov V.Dimitrov I.K.Li Q.,Supercond.Sci.Technol.,26(2013)013001.
[8]Obradors X.Puig T.Ricart S.Coll M.Gazquez J.Palau A.Granados X.,Supercond.Sci.Technol.,25(2012)123001.
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