Textured, polycrystalline, superconducting ceramic compositions

Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k

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501152, 501123, 252521, 505780, H01L 3900

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052739562

ABSTRACT:
Textured, dense, polycrystalline ceramic bodies are produced by a sinter-compression process which exhibit anisotropic superconducting properties. The bodies are produced from low density aggregates of crystalline particles by applying compressive forces to two opposed faces while permitting the aggregate to expand perpendicularly to the axis of compression. This produces a microcrystalline structure predominately composed of elongated platelike grains having their broad faces generally aligned with the body faces to which the compression was applied. The resulting bodies exhibit room temperature conductivity several times greater in a direction parallel to their compression faces than perpendicular thereto.

REFERENCES:
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Chu (1987), "Superconductivity above 90K", University of Houston, prepring, presented at The National Academy of Sciences, Seminar, Mar. 1987.
Hidaka, et al. (1987), "Anisotropic Properties of Superconducting Single-Crystal (La.sub.1-x, Sr.sub.x).sub.2 CuO.sub.4 ", J.J. Appl. Phys. Lett., 26 [4], L377.
Malozemoff, et al. (1987), "High Temperature Superconductivity Research at the IBM Thomas J. Watson and Alamaden Research Centers", IBM Research Labs preprint, Jun. 1987.
Uchida et al. (1987), "High T.sub.g Superconductivity of La-Ba-Cu Oxides", J.J. Appl. Phys. Left., 25 [1], L1-L2.
Yoshizaki et al. (1987), "Superconducting Properties of La.sub.1.85 Sr.sub.0.15 CuO.sub.4 made by Hot Press and Sinter Methods", Jpn. J. Appl. Phys. Pt. 2 Let., 26 [4]L311-L313.
Wu et al. (1987), "Superconductivity at 93K in a New Mixed-Phase Y-Ba-Cu-O Compound System at Ambient Pressure", Phys. Rev. Lett. 58 [9], 908-910.

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