Stability diagram for the system YBa[sub 2]Cu[sub 3]O[sub 7[minus]x]
Journal Article
·
· Journal of the American Ceramic Society; (United States)
- Purdue Univ., West Lafayette, IN (United States). School of Materials Engineering
The dependence of the degree of nonstoichiometry of YBa[sub 2]Cu[sub 3]O[sub 7[minus]x] (123) on temperature and oxygen pressure has been determined by thermogravimetric analysis (TGA) in the temperature range 400 to 950 C and the oxygen pressure range 10[sup [minus]6] to 1 atm. The nature of the decomposition of 123 in the temperature range 750 to 950 C and the oxygen pressure range 10[sup [minus]6] to 10[sup [minus]2] atm has been determined by TGA and X-ray diffractometry (XRD). As the oxygen pressure decreases, the decomposition of 123 follows the sequence 123 [r arrow] Y[sub 2]BaCuO[sub 5] (211) + BaCuO[sub 2] + Cu[sub 2]O [r arrow] 211 + BaCuO[sub 2] + BaCu[sub 2]O[sub 2] [r arrow] 211 + YBa[sub 3]Cu[sub 2]O[sub x] (132) + BaCu[sub 2]O[sub 2] [r arrow] 211 + BaCu[sub 2]O[sub 2] + BaO. The incongruent melting temperatures have been determined in the oxygen pressure range 10[sup [minus]6] to 1 atm by differential thermal analysis, and the phases formed on solidification have been identified by XRD. The stability diagram for the composition 123 has been constructed.
- OSTI ID:
- 7233568
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:3; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DIAGRAMS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DIAGRAMS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES