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

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...

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Bibliographic Details
Published inChemistry of materials Vol. 5:6
Main Authors Marquez, L.N., Keller, S.W., Stacy, A.M., Fendorf, M., Gronsky, R.
Format Journal Article
LanguageEnglish
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
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Summary: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 relatively large, plates with rectangular rather than square faces and are free of the a-b twin boundaries associated with the uptake of oxygen at the orthorhombic-to-tetragonal phase transformation. It is notable that these materials do not contain alkali metals. 19 refs., 4 figs.
Bibliography:AC03-76SF00098
ISSN:0897-4756
1520-5002
DOI:10.1021/cm00030a007