【摘要】 Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_x 超导体在65O℃O₂中等温退火,调制结构由纯Pb型,经由Bi,Pb混合型,最后变为纯Bi型;反之,经Q₂处理后,又在650℃流动N₂中等温退火,调制结构又由纯Bi型,过渡到Bi,Pb混合型,最终将恢复到纯Pb型,整个过程基本可逆.调制结构的变化与Pb离子运动密切相关,Pb离子分布不均,导致Bi,Pb混合型调制结构.更多还原

【Abstract】 Upon annealing Bi1.6Pb0.4Sr2Ca2Cu3Ox compound at 650℃ in flowing oxygen the modulated structure was changed from the Pb-type via the mixed type to the Bi-type. While the specimen was subjected to sequent annealing in flowing nitrogen at 650℃, the modualated structure was changed back from the pure Bi-type via the mixed type to the pure Pb-type. The process was almost reversible. The change in the modulated structure was closely related to the motion of Pb ions. And the inhomogenity of the Pb ion distribution led to the mixed modulated structure.更多还原