Preparation of Ba2YCu3O7-y with Tc below 65 K

Abstract
The compound Ba2YCu3O7-y (7-yc dimensions of the final products. The orthorhombic phase with 7-yc cell dimension of 11.743-11.757 Å was also unstable below 570°C, and unknown green phases were produced instead of Ba2YCu3O7-y .

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