GROWTH OF C-AXIS-ORIENTED FILMS OF YBBA2CU3O7-DELTA ON SINGLE AND POLYCRYSTALLINE MGO SUBSTRATES BY OXIDATION OF A LIQUID ALLOY PRECURSOR

被引：4

作者：

LUO, JS ^{[1
]}

MERCHANT, N ^{[1
]}

MARONI, VA ^{[1
]}

GRUEN, DM ^{[1
]}

TANI, BS ^{[1
]}

SANDHAGE, KH ^{[1
]}

CRAVEN, CA ^{[1
]}

机构：

[1] AMER SUPERCONDUCTOR CORP,WATERTOWN,MA 02172

来源：

PHYSICA C | 1992年 / 192卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(92)90841-Y

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Textured superconducting films of YbBa2Cu3O7-delta supported on both single and polycrystalline MgO substrates were prepared by oxidation of a liquid precursor alloy. The substrates were coated by dipping them into the molten alloy (YbBa2Cu3, melting point approximately 870-degrees-C). After withdrawal from the melt, the adhering metal was oxidized to the corresponding oxide phase, i.e., YbBa2Cu3O7-delta, which exhibited a superconducting transition at approximately 80 K following annealing in pure O2 at 500-degrees-C. With MgO(100) substrates, evidence was seen for the epitaxial growth of YbBa2Cu3O7-delta crystals having their c-axis parallel to the [100] direction of the substrate. For polycrystalline MgO, X-ray diffraction and microstructural examination showed that the high-T(c) crystallites in the films were also oriented with their c-axis perpendicular to the substrate surface, but the directions of the a and b axes were disordered rather than epitaxial. The superconducting properties of as-prepared films are discussed together with the effects of key processing parameters on composition and microstructure.

引用

页码：356 / 361

页数：6

共 18 条

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