Method for preparing a single crystal of lanthanum cuprate

Details Method for preparing a single crystal of lanthanum cuprate Method for preparing a single crystal of lanthanum cuprate

1988-03-14

1990-09-11

Straub, Gary P.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505729, 1566171, 1566181, 1566191, 156DIG76, 423593, C30B 1530

Patent

active

049563343

ABSTRACT:
Lanthanum cuprate, La.sub.2 CuO.sub.4, is a superconductive oxide. In order to prepare a single crystal of lanthanum cuprate, the phase diagram of La.sub.2 O.sub.3 -CuO system is determined utilizing their differential thermal analysis and X-ray diffractometry. Cu oxide and at least one of lanthanum oxide and lanthanum carbonate are mixed in the molar ratio of 71.1-92.9:28.9-7.1. The resulting mixture is heated to be molten. While slowly cooling the melt, nuclei of La.sub.2 CuO.sub.4 precipitate from the melt, growing to single crystals in the melt. As a result, large scale single crystals are prepared.

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