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Citation: Tang Youqi, Zhang Yufen*, Zheng Xiangmiao, Wei Chengquian, Lin Bingxiong. FORMATION MECHANISM OF HIGH T_C SUPERCONDUTING PHASE YBa₂Cu₃O_7-δ[J]. Acta Physico-Chimica Sinica, ;1988, 4(03): 234-238. doi: 10.3866/PKU.WHXB19880303 shu

FORMATION MECHANISM OF HIGH T_C SUPERCONDUTING PHASE YBa₂Cu₃O_7-δ

1.
Institute of Physical Chemistry; Peking University

Received Date: 24 March 1988
Available Online: 15 June 1988

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 tetra nal phase I (YBa_2Cu_3O_(6.9)) is formed. At 930 ℃, an oxygen-deficient tetra nal 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 tetra nal phase transits into the orthorhombic phase at 650 ℃, which makes differences in oxygen-ocupancy at these two positions, such that the structure deviates from tetra nality and the superconduting properties are improved.
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FORMATION MECHANISM OF HIGH TC SUPERCONDUTING PHASE YBa2Cu3O7-δ

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FORMATION MECHANISM OF HIGH T_C SUPERCONDUTING PHASE YBa₂Cu₃O_7-δ