物理化学学报 >> 1988, Vol. 4 >> Issue (03): 234-238.doi: 10.3866/PKU.WHXB19880303
唐有祺; 张玉芬; 郑香苗; 韦承谦; 林炳雄
Tang Youqi; Zhang Yufen*; Zheng Xiangmiao; Wei Chengquian; Lin Bingxiong
Abstract: The Y-Ba-Cu mixed oxide system is obtained when any kinds of materials containing Y, Ba, Cu are heated at 850 ℃. when heated to 900 ℃, an oxygen-rich tetragonal phase I (YBa_2Cu_3O_(6.9)) is formed. At 930 ℃, an oxygen-deficient tetragonal phase Ⅱ (YBa_2Cu_3O_6) appears, and the oxygens at positions (1/2, 0,0) and (0,1/2,0) are almost drived out. The oxygen absorbed above 650 ℃ are equally distributed onto (1/2,0,0) and (0,1/2,0), the amount of which varies with temperature. It is absorbed oxygen that migrates easily from (0, 1/2, 0) to (1/2, 0, 0) as the tetragonal phase transits into the orthorhombic phase at 650 ℃, which makes differences in oxygen-ocupancy at these two positions, such that the structure deviates from tetragonality and the superconduting properties are improved.
唐有祺;张玉芬;郑香苗;韦承谦;林炳雄. 高Tc YBa2Cu3O7-δ起导相生成的机理[J]. 物理化学学报, 1988, 4(03): 234-238.
Tang Youqi; Zhang Yufen*; Zheng Xiangmiao; Wei Chengquian; Lin Bingxiong. FORMATION MECHANISM OF HIGH TC SUPERCONDUTING PHASE YBa2Cu3O7-δ[J]. Acta Phys. -Chim. Sin., 1988, 4(03): 234-238.
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