Structural phase transition study of Ba/sub 2/YCu/sub 3/O/sub 6+//sub x/ in air

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · J. Mat. Res.; (United States)

OSTI ID:7127733

Wong-Ng, W; Cook, L P; Chiang, C K; Swartzendruber, L J; Bennett, L H; Blendell, J; Minor, D

A structural phase transition study of Ba/sub 2/YCu/sub 3/O/sub 6+//sub x/ (x = 0 to 1) has been conducted on a series of 13 quenched samples. These samples were prepared from an orthorhombic material by annealing at temperatures from 400 to 1000 /sup 0/C in air, followed by rapid quenching. All quenchings were performed by using a liquid-nitrogen-cooled copper cold well with a continuous flow of cooled helium gas. Various measurements including x-ray diffraction, thermogravimetric analysis, Meissner effect, and scanning electron microscopy were carried out in order to correlate the nature of the phase transition with crystallographic data, superconductivity, and annealing temperature. The phase transition from Ba/sub 2/YCu/sub 3/O/sub 7/ to Ba/sub 2/YCu/sub 3/O/sub 6/ appears to involve two orthorhombic regions: region A with a

• Research Organization: Institute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, Maryland 20899
• OSTI ID: 7127733
• Journal Information: J. Mat. Res.; (United States), Journal Name: J. Mat. Res.; (United States) Vol. 3:5; ISSN JMREE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
HEAT TREATMENTS
ORDER-DISORDER TRANSFORMATIONS
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POWDERS
SCATTERING
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES