Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1988-07-07
1989-09-05
Straub, Gary P.
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
252 1, 252500, 252518, 252521, 423263, 423593, 428402, 428930, 505 1, 505809, 505810, 505815, 427 62, 501152, 156DIG63, H01B 106, H01L 3900, B05D 506, C01F 1700
Patent
active
048635219
ABSTRACT:
An aqueous solution of the monocarboxylates of Y, Ba, and Cu is spray dried, providing a contaminant-free non-hygroscopic product which is homogeneous at the atomic level. In a preferred embodiment Y, Ba, and Cu acetates are used in a molecular ratio of 1:2:3, giving a product which can be calcined to give a superconducting mixed oxide, YBa.sub.2 Cu.sub.3 O.sub.x, where x is 6.8-7.0.
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Cava, R. J., et al, Bulk Superconductivity at 91 K in Single-Phase Oxygen Deficient Perovskite Ba.sub.2 YCu.sub.3 O.sub.9-.delta., Phys. Rev. Lett., 58, 1676-1679 (4-20-87).
Nguyen, N. et al, Oxygen Defect K.sub.2 NiF.sub.4 -Type Oxides: The Compounds La.sub.2-x Sr CuO.sub.4-x/2+.delta., Jour. Solid State Chem., 39, 120-127 (1981).
Nguen, N., et al., Oxydes Ternaires de Cuivre a Valence Mixte de Type K.sub.2 NiF.sub.4 Deficitaires en Oxygene: Evolution Progressive d'un Etat Semi-conducteur vers un Etat Semi-metallique Des Oxydes La.sub.2-x Sr.sub.x CuO.sub.4-x/2+.delta., J. Phys. Chem. Solids, 44, 389-400 (1983).
McDowell, Jr. William W.
Straub Gary P.
W. R. Grace & Co.,-Conn.
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