Influence of iron doping on the microstructure of YBa[sub 2](Cu[sub 1[minus]x]Fe[sub x])[sub 3]O[sub 7[minus][delta]]

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb04027.x· OSTI ID:5727323

Diko, P; Lanckbeen, A; Deltour, R ^[1]; Duvigneaud, P; Moer, A V; Naessens, G ^[2]

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1. Univ. Libre de Bruxelles (Belgium). Service de Physique
2. Univ. Libre de Bruxelles (Belgium). Service de Chimie

Porosity, grain growth, phase composition, and microstructural defects were studied in sintered YBa[sub 2]((Cu[sub 1[minus]x])Fe[sub x])[sub 3]O[sub 7[minus][delta]] ceramics for x values up to 0.3. The porosity of the samples, related to the sintering mechanism, was independent of iron concentration. A linear dependence of the grain size with the inverse of the iron concentration was found, strongly suggesting grain boundary segregation of iron. The solubility limit was estimated to be x = 0.18 at 950 C in O[sub 2]. Beyond this limit, a new microstructural component was found consisting of YBa[sub 2]((Cu[sub 1[minus]x]Fe[sub x])[sub 3])O[sub 7[minus][delta]], YBaCuFeO[sub 5] and Ba(Cu,Fe)O[sub 2]. The transition from an orthorhombic twin to an orthorhombic tweed phase and a tetragonal phase was detected by polarized light microscopy.

• OSTI ID: 5727323
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:11; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

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
DOPED MATERIALS
ELEMENTS
IRON
IRON COMPOUNDS
IRON OXIDES
MATERIALS
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POROSITY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES