Synthesis of twin-free, orthorhombic EuBa[sub 2]Cu[sub 3]O[sub 7[minus][partial derivative]] superconductors at 450[degrees]C by direct precipitation from molten NaOH and KOH

• Published in: Chemistry of materials Vol. 5:6
• Main Authors: Marquez, L.N., Keller, S.W., Stacy, A.M., Fendorf, M., Gronsky, R.
• Format: Journal Article
• Language: English
• Published: United States 01.06.1993
• Subjects: 360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 400201 - Chemical & Physicochemical Properties; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; BARIUM OXIDES; CHALCOGENIDES; CHEMICAL PREPARATION; COPPER COMPOUNDS; COPPER OXIDES; CRYSTAL LATTICES; CRYSTAL STRUCTURE; ELECTRON MICROSCOPY; EUROPIUM COMPOUNDS; EUROPIUM OXIDES; FIGS; FOOD; FRUITS; GADOLINIUM COMPOUNDS; GADOLINIUM OXIDES; HYDROGEN COMPOUNDS; HYDROXIDES; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; MATERIALS SCIENCE; MICROSCOPY; MOLTEN SALTS; NEODYMIUM COMPOUNDS; NEODYMIUM OXIDES; ORTHORHOMBIC LATTICES; OXIDES; OXYGEN COMPOUNDS; POTASSIUM COMPOUNDS; POTASSIUM HYDROXIDES; PRECIPITATION; RARE EARTH COMPOUNDS; SALTS; SAMARIUM COMPOUNDS; SAMARIUM OXIDES; SCANNING ELECTRON MICROSCOPY; SEPARATION PROCESSES; SODIUM COMPOUNDS; SODIUM HYDROXIDES; STOICHIOMETRY; SUPERCONDUCTORS; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS

The superconducting, orthorhombic form of RBa[sub 2]Cu[sub 3]O[sub 7[minus][partial derivative]] for R = Nd, Sm, Eu, and Gd has been synthesized by direct precipitation from molten NaOH and KOH at 450[degrees]C. In contrast to materials prepared by standard ceramic methods, the products obtained are...