PHASE RELATION AND SUPERCONDUCTIVITY IN THE OXYGEN NONSTOICHIOMETRIC SYSTEM, BA2YCU3OX

被引：23

作者：

KANNO, R ^{[1
]}

TAKEDA, Y ^{[1
]}

HASEGAWA, M ^{[1
]}

YAMAMOTO, O ^{[1
]}

TAKANO, M ^{[1
]}

IKEDA, Y ^{[1
]}

BANDO, Y ^{[1
]}

机构：

[1] KYOTO UNIV,INST CHEM RES,UJI,KYOTO 611,JAPAN

来源：

MATERIALS RESEARCH BULLETIN | 1987年 / 22卷 / 11期

关键词：

CRYSTALS - Structure - HEAT TREATMENT - Annealing - OXIDES - Synthesis - YTTRIUM COMPOUNDS - Phase Transitions;

D O I：

10.1016/0025-5408(87)90218-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The superconducting Ba//2YCu//3O//x system prepared under various annealing conditions has been characterized by differential thermal analysis, thermogravimetry, powder X-ray diffraction and electrical resistivity measurements. Oxygen content x increases from 5. 86 to 7. 14 as the annealing temperature varies from 1273 to 473 K. The lattice symmetry is tetragonal for x equals 5. 86 and orthorhombic for x greater than 6. 01. The resistivity decreases from an order of 10**0 to 10** minus **4 OMEGA cm with increasing x from 5. 86 to 6. 86, but tends to increase for x greater than 6. 86; the highest Tc of about 88 K( rho equals 0) has been obtained for Ba//2YCu//3O//6//. //8//6, where the Cu**3** plus /Cu**2** plus ratio reaches 0. 72/2. 28. A change in x of plus or minus 0. 1 results in a considerable depression of Tc.

引用

页码：1525 / 1532

页数：8

共 12 条

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