Mapping the orthorhombic-to-tetragonal transition at ambient temperature in YBa/sub 2/Cu/sub 3/O/sub y/ ceramics

Journal Article · Tue Nov 15 00:00:00 EST 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.342462· OSTI ID:7016450

Kistenmacher, T J

The orthorhombic-to-tetragonal transition at ambient temperature in YBa/sub 2/Cu/sub 3/O/sub y/ ceramics is empirically mapped as a function of oxygen content (y) based on published neutron and x-ray diffraction studies. On approaching the transition region (yapprox.6.5) from the orthorhombic phase, there is a noticeable anomaly in the c-axis length, a smooth evolution of the b axis, and a rather abrupt transition of the a axis (the axis along which oxygen deficiency obtains at larger values of y in the orthorhombic phase). Finally, the empirical method developed here for ascertaining oxygen content from crystallographic data is compared to neutron, hydrogen reduction, and iodometric titration results for several metastable YBa/sub 2/Cu/sub 3/O/sub y/ ceramics and Fe- and Co-doped materials.

• Research Organization: Milton S. Eisenhower Research Center, Applied Physics Laboratory, The Johns Hopkins University, Laurel, Maryland 20707-6099
• OSTI ID: 7016450
• Journal Information: J. Appl. Phys.; (United States), Vol. 64:10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CHEMICAL COMPOSITION
CRYSTAL-PHASE TRANSFORMATIONS
COPPER OXIDES
YTTRIUM OXIDES
CRYSTAL STRUCTURE
ORTHORHOMBIC LATTICES
TETRAGONAL LATTICES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication