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Kinetic processes of the orthorhombic to tetragonal phase transition in YBa/sub 2/Cu/sub 3/O/sub 7-delta/

Conference ·
OSTI ID:7203364
;
The kinetic processes driving the orthorhombic to tetragonal (O-T) phase transition in YBa''CunumberO/sub 7-delta/ have been explored to study the formation of the 123 superconducting phases at different temperatures, as well as the oxygen diffusion in the 123 material. An isothermal transformation curve marking the O-T phase transition boundaries has been established over a wide temperature range. These data suggest the existence of two thermodynamically distinct superconducting phases in the 123 material. Magnetization vs. field data are presented for the samples that were isothermally annealed at 400/sup 0/C. The results indicate that the T-O transformation is a nucleation and growth process which is governed by oxygen diffusion. The growth geometry during the T-O transformation is discussed.
Research Organization:
Argonne National Lab., IL (USA)
DOE Contract Number:
W-31109-ENG-38
OSTI ID:
7203364
Report Number(s):
CONF-880408-31; ON: DE88011993
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DATA
EXPERIMENTAL DATA
INFORMATION
NUMERICAL DATA
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SYNTHESIS
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES