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23 May 1988

Volume 52, Issue 21, pp. 1759-1836

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Improved press forging of Ba2YCu3Ox superconductor

G. S. Grader, H. M. O’Bryan, and W. W. Rhodes

Appl. Phys. Lett. 52, 1831 (1988); http://dx.doi.org/10.1063/1.99729 (3 pages) | Cited 25 times

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An improved press forging technique has yielded ceramic Ba2YCu3Ox with a very high degree of orientation and mechanical integrity. The as‐forged samples are dense and tetragonal, and have an oxygen content of ≊6.3. By a partial oxidation of the samples, a superconducting skin 20–100 μm thick is formed on the outer surface. Transport measurements on this skin show a Jc >3000 A/cm2 with an improved field dependence as compared with randomly oriented samples. The restriction of oxidation to the thin outer skin has reduced the microcracking which accompanies the oxidation of tetragonal Ba2YCu3Ox.
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74.25.Sv Critical currents
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
74.70.-b Superconducting materials other than cuprates
74.78.-w Superconducting films and low-dimensional structures
81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)

Transmission electron microscopy studies of superconducting Y‐Ba‐Cu‐O films prepared by laser deposition

D. M. Hwang, L. Nazar, T. Venkatesan, and X. D. Wu

Appl. Phys. Lett. 52, 1834 (1988); http://dx.doi.org/10.1063/1.99730 (3 pages) | Cited 18 times

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The polycrystalline structure of pulsed‐laser deposited Y‐Ba‐Cu‐O thin films was studied using transmission electron microscopy. Many grains of the superconducting films on (001) SrTiO3 substrates had the c axis normal to the surface, while grains on (110) facets had their c axis oriented preferentially along the interface. Observation of an amorphous layer of thickness ∼6 nm at some oriented grain‐substrate interfaces suggests that the amorphous layer is formed subsequent to the formation of the crystalline structures. Surface ridges were found to facilitate the formation of triple points where the grain boundaries between nonepitaxial grains were pinned.
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68.55.-a Thin film structure and morphology
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