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

Journal Article · · Chemistry of Materials; (United States)

OSTI ID:7115877

Andreas, M T; Kingon, A I ^[1]

---

1. 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), Vol. 3:3; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM OXIDES
CHEMICAL PREPARATION
ELECTRIC CONDUCTIVITY
MAGNETIC SUSCEPTIBILITY
BISMUTH OXIDES
CADMIUM OXIDES
COPPER OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
CATIONS
CHEMICAL REACTIONS
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CADMIUM COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL ANALYSIS
COHERENT SCATTERING
COPPER COMPOUNDS
DATA
DIFFRACTION
ELECTRICAL PROPERTIES
GRAVIMETRIC ANALYSIS
INFORMATION
IONS
MAGNETIC PROPERTIES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
SYNTHESIS
TEMPERATURE RANGE
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)
400201 - Chemical & Physicochemical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties