Cadmium substitution in YBa sub 2 Cu sub 3 O sub 7 minus. delta. and Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8+. delta
- North Carolina State Univ., Raleigh (United States)
The chemical interactions of CdO with YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}, and related oxides are examined. Mixtures of CdO with other oxides (Y-Ba-Cu-O, BaO{sub 2}, CuO, Y{sub 2}O{sub 3}, Bi-Sr-Ca-Cu-O, CeO{sub 2}, and CaO) were heated to 800-900C under N{sub 2}, O{sub 2}, air, and 1.5 GPa quasi-hydrostatic pressure. The reacted samples were characterized by powder X-ray diffractometry, thermogravimetric analysis, and dc resistivity and ac magnetic susceptibility measurements. CdO was found to be chemically inert under most of these conditions. When CaO is present, the cubic CaCdO{sub 2} is formed. Cadmium(II) can be partially substituted for yttrium(III) (up to 30 mol %) in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} without detriment to superconducting properties. Although Cd{sup 2+} is aliovalent to Y{sup 3+}, charge compensation is achieved by the formation of additional oxygen vacancies, as evidenced by TGA measurements. This oxygen vacancy formation occurs rather than the expected change in hole concentration in the CuO chains and planes. Also, investigations of CdO substitution by other groups are reviewed.
- DOE Contract Number:
- FG05-88ER45359
- OSTI ID:
- 7115877
- Journal Information:
- Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 3:3; ISSN CMATE; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CADMIUM COMPOUNDS
CADMIUM OXIDES
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
GRAVIMETRIC ANALYSIS
HIGH-TC SUPERCONDUCTORS
INFORMATION
IONS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES