Bi(2223) thick films (TC(0)=109K) on Ba2GdNbO6: a new perovskite ceramic substrate for BSCCO superconductor

Applied Superconductivity Pub Date : 1998-06-01 DOI:10.1016/S0964-1807(98)00068-4

J. Kurian, K.V.O. Nair, P.K. Sajith, Asha M. John, J. Koshy

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引用次数: 18

Abstract

Ba₂GdNbO₆ has been developed as a new substrate suitable for the BSCCO superconductor. Ba₂GdNbO₆ has a complex cubic perovskite (A₂BB′O₆) structure with a lattice constant a=8.587 Å. The DTA studies revealed that there is no phase transition occurring in Ba₂GdNbO₆ in the temperature range of 30–1300°C. The thermal expansion coefficient of Ba₂GdNbO₆ is found to be 7.913×10⁻⁶°C⁻¹. The dielectric constant and loss factor of Ba₂GdNbO₆ are in a range suitable for its use as a substrate for microwave applications. The Bi(2223) superconductor does not show any detectable chemical reaction with Ba₂GdNbO₆ even under extreme processing conditions. The thick films of Bi(2223) dip-coated on polycrystalline Ba₂GdNbO₆ substrate gave a T_C(0) of 109 K and a current density of approximately 4×10³ A/cm² at 77 K and zero magnetic field.

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BSCCO超导体新型钙钛矿陶瓷衬底:Ba2GdNbO6上的Bi(2223)厚膜(TC(0)=109K

Ba2GdNbO6是一种适用于BSCCO超导体的新型衬底材料。Ba2GdNbO6具有复杂的立方钙钛矿(A2BB 'O6)结构，晶格常数a=8.587 Å。DTA研究表明，在30 ~ 1300℃的温度范围内，Ba2GdNbO6没有发生相变。结果表明，Ba2GdNbO6的热膨胀系数为7.913×10−6°C−1。Ba2GdNbO6的介电常数和损耗因子在合适的范围内，适合作为微波应用的衬底。即使在极端的加工条件下，Bi(2223)超导体也不会与Ba2GdNbO6发生任何可检测的化学反应。在多晶Ba2GdNbO6衬底上浸涂Bi(2223)厚膜，在77 K和零磁场条件下，TC(0)为109 K，电流密度约为4×103 a /cm2。

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Applied Superconductivity

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