Formation of BaCeO[sub 3] and its influence on microstructure of sintered/melt-textured Y--Ba--Cu--O oxides with CeO[sub 2] addition

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Journal of Materials Research; (United States)

DOI:https://doi.org/10.1557/JMR.1994.1952· OSTI ID:7072218

Kim, C; Kim, K; Won, D ^[1]; Moon, H; Suhr, D ^[2]; Lai, S H; McGinn, P J ^[3]

---

1. Superconductivity Research Department, Korea Atomic Energy Research Institute, P.O. Box 7, Daedukdanji, Daejon, 305-606 (Korea, Republic of)
2. Department of Materials Science and Engineering, Choongnam National University, Daeduk Science Town, Daejon, 301-764 (Korea, Republic of)
3. Center for Materials Science and Engineering, Department of Electrical Engineering, University of Notre Dame, Notre Dame, Indiana 46556 (United States)

Formation of BaCeO[sub 3] and its effects on microstructure were studied in sintered/melt-textured Y--Ba--Cu--O oxides containing 5 wt.% CeO[sub 2] and various amounts of Y[sub 2]Ba[sub 1]Cu[sub 1]O[sub 5]. The added CeO[sub 2] was converted to fine particles of BaCeO[sub 3] near 930 [degree]C which is the conventional sintering temperature for Y--Ba--Cu--O. Y[sub 2]Ba[sub 1]Cu[sub 1]O[sub 5] and CuO are formed as by-products of the reaction between CeO[sub 2] and Y[sub 1]Ba[sub 2]Cu[sub 3]O[sub 7[minus]] [sub [ital y]] phase. The CeO[sub 2] addition reduced the particle size of Y[sub 2]B[sub 1]Cu[sub 1]O[sub 5] which was trapped in the Y[sub 1]Ba[sub 2]Cu[sup 3]O[sub 7[minus]][sub [ital y]] matrix after the melt-texture growth. During the peritectic decomposition stage of Y[sub 1]Ba[sub 2]Cu[sub 3]O[sub 7[minus]][sub [ital y]] phase into Y[sub 2]B[sub 1]Cu[sub 1]O[sub 5] and liquid phase, the morphology of the decomposed Y[sub 2]Ba[sub 1]Cu[sub 1]O[sub 5] was changed from a blocky shape in the undoped sample to an acicular shape of high anisotropy in the CeO[sub 2]-added sample. The formation of the highly anisotropic Y[sub 2]Ba[sub 1]Cu[sub 1]O[sub 5] particles appears to be responsible for the refinement of Y[sub 2]Ba[sub 1]Cu[sub 1]O[sub 5] particle after the melt-texture processing.

• DOE Contract Number: FG02-90ER45427
• OSTI ID: 7072218
• Journal Information: Journal of Materials Research; (United States), Journal Name: Journal of Materials Research; (United States) Vol. 9:8; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ADDITIVES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
FABRICATION
HIGH-TC SUPERCONDUCTORS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SINTERING
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TEXTURE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES